diff --git a/packages/ads1015/ads1015.mjs b/packages/ads1015/ads1015.mjs
index a385229..be767a7 100755
--- a/packages/ads1015/ads1015.mjs
+++ b/packages/ads1015/ads1015.mjs
@@ -11,12 +11,7 @@ var ADS1015 = function (i2cPort, slaveAddress) {
 
 ADS1015.prototype = {
   init: async function () {
-    try {
-      this.i2cSlave = await this.i2cPort.open(this.slaveAddress)
-    } catch (error) {
-      console.error("ADS1015.init() Error: " + error.message);
-      throw error;
-    }
+    this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
   },
   read: async function (channel) {
     if (this.i2cSlave == null) {
@@ -36,19 +31,9 @@ ADS1015.prototype = {
     var confL = config >> 8;
     var confH = config & 0x00ff;
     var data = confH | confL;
-
-    try {
-      await this.i2cSlave.write16(0x01, data);
-    } catch (error) {
-      throw new Error("ADS1015.read: write16(0,config) error" + error.message);
-    }
+    await this.i2cSlave.write16(0x01, data);
     await sleep(10);
-    var v;
-    try {
-      v = await this.i2cSlave.read16(0);
-    } catch (error) {
-      throw new Error("ADS1015.read: read16(0) error" + error.message);
-    }
+    var v = await this.i2cSlave.read16(0);
     var vH = (v & 0x00ff) << 8;
     var vL = (v >> 8) & 0x00ffff;
     var value = (vH | vL) >> 4;
diff --git a/packages/ads1x15/ads1x15.mjs b/packages/ads1x15/ads1x15.mjs
index b5620f5..800efc5 100755
--- a/packages/ads1x15/ads1x15.mjs
+++ b/packages/ads1x15/ads1x15.mjs
@@ -17,26 +17,18 @@ var ADS1x15 = function(i2cPort,slaveAddress){
 
 ADS1x15.prototype = {
 	init: async function(isAds1115, amplifierSelection){
-		try{
-			if ( isAds1115 ){
-				this.convertDelay = 80; // 測定が安定するには・・・
-				this.bitShift = 0;
-				console.log("ADS1115.init (16bitADC) OK");
-			} else {
-				this.convertDelay = 10; // 本来は1ms?
-				this.bitShift = 4;
-				console.log("ADS1015.init (12bitADC) OK");
-			}
-			if ( amplifierSelection != undefined  && amplifierSelection>=0 && amplifierSelection < 8){
-				this.amplifierConf = amplifierSelection;
-			}
-			console.log("set amplifier to +-" + this.amplifierTable[this.amplifierConf]);
-			var i2cSlave = await this.i2cPort.open(this.slaveAddress);
-			this.i2cSlave = i2cSlave;
-		} catch(error){
-			console.log("ADS1015.init() Error: "+error.message);
-			throw Error(error);
+		if (isAds1115) {
+			this.convertDelay = 80; // 測定が安定するには・・・
+			this.bitShift = 0;
+		} else {
+			this.convertDelay = 10; // 本来は1ms?
+			this.bitShift = 4;
+		}
+		if (amplifierSelection != undefined && amplifierSelection >= 0 && amplifierSelection < 8) {
+			this.amplifierConf = amplifierSelection;
 		}
+		var i2cSlave = await this.i2cPort.open(this.slaveAddress);
+		this.i2cSlave = i2cSlave;
 	},
 	read: async function(channel){
 		var config;
@@ -50,25 +42,23 @@ ADS1x15.prototype = {
 			config= 0x3000;
 		} else{
 			channel = Number(channel);
-			if((channel > 3)||(channel < 0)){
-				console.log("ADS1x15.read: channel error "+channel);
-				throw Error("ADS1x15.read: channel error "+channel);
+			if ((channel < 0) || (3 < channel)) {
+				throw new Error("ADS1x15.read: channel error " + channel);
 			} else {
 				channel = Number(channel);
 				config = 0x4000 + (channel * 0x1000); // ADC channel
 			}
 		}
-		if(!this.i2cSlave){
-			console.log("i2cSlave is gone.....");
-			throw Error("i2cSlave is gone.....");
+
+		if (this.i2cSlave == null) {
+			throw new Error("i2cSlave is gone.....");
 		}
-//      	console.log((config).toString(16));
+
 		config |= 0x8000; // Set 'start single-conversion' bit
 		config |= 0x0003; // Disable the comparator (default val)
 		config |= 0x0080; // 1600SPS(samples per second)(ADS1015),128SPS(ADS1115)  (default)
 		config |= 0x0100; // Power-down single-shot mode (default)
 		config |= (this.amplifierConf << 9);  // 0x0200; // +/-4.096V range = Gain 1
-//      	console.log((this.amplifierConf << 9).toString(16));
 		var confL = config >> 8;
 		var confH = config & 0x00ff;
 		var data = confH | confL;
@@ -84,22 +74,10 @@ ADS1x15.prototype = {
 		var vL = (v >> 8)& 0x00ffff;
 		var value = (vH | vL) >> this.bitShift;
 		this.prevCh = channel;
-		return ( value );
+		return value;
 	},
-	getSignedVal: function( w ){
-		// Convert 16bit two's complement data to signed integer while maintaining endianness
-		//  console.log("getSignedVal:",w.toString(16),"   :" , w);
-		//  console.log("getSignedVal:",w);
-		// var l = w >>> 8;
-		// var b = w & 0xff;
-		// var v = l + ( b << 8 );
-		var v = w;
-//		console.log("Val:",w.toString(16),b.toString(16),l.toString(16),v.toString(16),b,l,v);
-		if ( v >= 0x8000 ){
-			return ( - ((65535 - v ) + 1 ) );
-		} else {
-			return(v);
-		}
+	getSignedVal: function (val) {
+		return new Int16Array([val])[0];
 	},
 	getVoltage: function(rawVal){
 		return ( this.amplifierTable[this.amplifierConf] * 2 * this.getSignedVal(rawVal) / ( this.bitShift == 4 ? 0x0fff : 0xffff ) );
diff --git a/packages/adt7410/adt7410.mjs b/packages/adt7410/adt7410.mjs
index c0f38fe..cc99f68 100755
--- a/packages/adt7410/adt7410.mjs
+++ b/packages/adt7410/adt7410.mjs
@@ -1,32 +1,22 @@
-var ADT7410 = function(i2cPort,slaveAddress){
+var ADT7410 = function(i2cPort, slaveAddress) {
   this.i2cPort = i2cPort;
   this.i2cSlave = null;
   this.slaveAddress = slaveAddress;
 };
 
 ADT7410.prototype = {
-  init: function(){
-    return new Promise((resolve, reject)=>{
-      this.i2cPort.open(this.slaveAddress).then((i2cSlave)=>{
-        this.i2cSlave = i2cSlave;
-        console.log("init ok:"+this.i2cSlave);
-        resolve();
-      },(err)=>{
-        reject(err);
-      });
-    });
+  init: async function() {
+    this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
   },
-  read: function(){
-    return new Promise(async (resolve, reject)=>{
-      if(this.i2cSlave == null){
-        reject("i2cSlave Address does'nt yet open!");
-      }else{
-         var MSB = await this.i2cSlave.read8(0x00);
-         var LSB = await this.i2cSlave.read8(0x01);
-         var data = ((MSB << 8) + LSB)/128.0;
-         resolve(data);
-      }
-    });
+  read: async function() {
+    if (this.i2cSlave == null) {
+      throw new Error("i2cSlave is not open yet.");
+    }
+
+    var MSB = await this.i2cSlave.read8(0x00);
+    var LSB = await this.i2cSlave.read8(0x01);
+    var data = ((MSB << 8) + LSB) / 128.0;
+    return data;
   }
 };
 
diff --git a/packages/ak8963/ak8963.mjs b/packages/ak8963/ak8963.mjs
index f54138e..2953ed0 100755
--- a/packages/ak8963/ak8963.mjs
+++ b/packages/ak8963/ak8963.mjs
@@ -61,11 +61,9 @@ AK8963.prototype = {
 
 		this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
 		var whoamiVal = await this.i2cSlave.read8(cs._WIA);
-		if ( whoamiVal ==0x48){
-			console.log("This device is AK8963 magnetometer");
-		} else {
-			console.log("This device is NOT Supported...");
-			return(null);
+		if (whoamiVal !== 0x48) {
+			console.error("This device is NOT Supported...");
+			return null;
 		}
 
 		// Sensitivity adjustement values
@@ -90,8 +88,6 @@ AK8963.prototype = {
 		} else {
 			this._so = cs._SO_14BIT;
 		}
-		console.log("init AK8963 ok:  this._adjustement :",this._adjustement ,"  this._so:",this._so ,"  this.cs:",cs);
-
 	},
 	readData: async function(){
 		var cs = this.devConst;
@@ -99,7 +95,6 @@ AK8963.prototype = {
 		var mx = this.getVal(await this.i2cSlave.read16(cs._HXL)); // read16 is little endian
 		var my = this.getVal(await this.i2cSlave.read16(cs._HYL));
 		var mz = this.getVal(await this.i2cSlave.read16(cs._HZL));
-		console.log(mx,my,mz);
 		await this.i2cSlave.read8(cs._ST2) // Enable updating readings again
 
 		//Apply factory axial sensitivy adjustements
@@ -129,28 +124,15 @@ AK8963.prototype = {
 			z: mz
 		}
 	},
-	getVal: function( w ){
-		// Convert to signed integer while maintaining endianness
-		//  console.log("getVal:",w.toString(16),"   :" , w);
-		//  console.log("getVal:",w);
-		// var l = w >>> 8;
-		// var b = w & 0xff;
-		// var v = l + ( b << 8 );
-		var v = w;
-//		console.log("Val:",w.toString(16),b.toString(16),l.toString(16),v.toString(16),b,l,v);
-		if ( v >= 0x8000 ){
-			return ( - ((65535 - v ) + 1 ) );
-		} else {
-			return(v);
-		}
+	getVal: function (val) {
+		return new Int16Array([val])[0];
 	},
 	calibrate: async function (count, delay){
-		console.log("start calibrate: ");
-		if ( !count){
-			count=128;
+		if (!count) {
+			count = 128;
 		}
-		if ( !delay){
-			delay=100;
+		if (!delay) {
+			delay = 100;
 		}
 
 		this._offset = [0, 0, 0];
@@ -174,7 +156,6 @@ AK8963.prototype = {
 			minz = Math.min(minz, reading.z);
 			maxz = Math.max(maxz, reading.z);
 			count -= 1;
-			console.log(count," : " , reading);
 		}
 
 		// Hard iron correction
@@ -196,11 +177,7 @@ AK8963.prototype = {
 		var scale_z = avg_delta / avg_delta_z;
 
 		this._scale = [scale_x, scale_y, scale_z];
-
-		console.log("end calibrate: offset:",this._offset,"  scale:",this._scale );
-//		return self._offset, self._scale
 	}
-
 };
 
 export default AK8963;
diff --git a/packages/amg8833/amg8833.mjs b/packages/amg8833/amg8833.mjs
index d59d6bd..7ef5e69 100755
--- a/packages/amg8833/amg8833.mjs
+++ b/packages/amg8833/amg8833.mjs
@@ -19,15 +19,10 @@ var AMG8833 = function(i2cPort,slaveAddress){
 AMG8833.prototype = {
 	init: async function(){
 		this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
-		console.log("init ok:"+this.i2cSlave);
 		await this.setup();
 	},
-	getSVal: function(val){
-		if ( val & 0x8000 ){
-			return (( -val ^ 0xFFFF) + 1);
-		} else {
-			return ( val );
-		}
+	getSVal: function (val) {
+		return new Int16Array([val])[0];
 	},
 	setup: async function(){
 
@@ -44,9 +39,7 @@ AMG8833.prototype = {
 		await this.i2cSlave.write8(0x1F,0x00);
 
 		// get sensorTemperature
-		var sensorTemp = await this.i2cSlave.read16(0x0E);
-
-		console.log("sensorTemperature[deg]:",sensorTemp*0.0625);
+		await this.i2cSlave.read16(0x0E);
 	},
 	readData: async function(){
 		var tdata = [];
@@ -74,7 +67,6 @@ AMG8833.prototype = {
 				ansR.push(tdata[i*8+j]);
 			}
 			ans.push(ansR);
-//			console.log(msg);
 		}
 
 		return ( ans );
diff --git a/packages/arduino-stepping-motor/arduino-stepping-motor.mjs b/packages/arduino-stepping-motor/arduino-stepping-motor.mjs
index f86b385..3642ce3 100644
--- a/packages/arduino-stepping-motor/arduino-stepping-motor.mjs
+++ b/packages/arduino-stepping-motor/arduino-stepping-motor.mjs
@@ -1,105 +1,80 @@
-var SteppingMotor = function(i2cPort,slaveAddress){
+// @ts-check
+
+/** @param {number} ms Delay for a number of milliseconds. */
+const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
+
+var SteppingMotor = function(i2cPort, slaveAddress) {
   this.i2cPort = i2cPort;
   this.i2cSlave = null;
   this.slaveAddress = slaveAddress;
 };
 
 SteppingMotor.prototype = {
-  init: function(){
-    return new Promise((resolve, reject)=>{
-      this.i2cPort.open(this.slaveAddress).then(async (i2cSlave)=>{
-        this.i2cSlave = i2cSlave;
-        await this.i2cSlave.write16(0x03,0);
-        console.log("init ok:"+this.i2cSlave);
-        resolve();
-      },(err)=>{
-        reject(err);
-      });
-    });
-  },
-  readStatus: function(){
-    return new Promise(async (resolve, reject)=>{
-      if(this.i2cSlave == null){
-        reject("i2cSlave Address does'nt yet open!");
-      }else{
-         let data = await this.i2cSlave.read8(0x00);
-         resolve(data);
-      }
-    });
+  init: async function() {
+    this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
+    await this.i2cSlave.write16(0x03, 0);
   },
-  move: function(step){
-    return new Promise(async (resolve, reject)=>{
-      if(this.i2cSlave == null){
-        reject("i2cSlave Address does'nt yet open!");
-      }else{
-        if(step>0)
-          await this.i2cSlave.write16(0x01,(step|0));
-        if(step<0)
-          await this.i2cSlave.write16(0x02,(-step|0));
-        let shortSleep=()=>{
-          return new Promise(resolve => setTimeout(resolve, 100));
-        }
-        for(;;){
-          let busy = await this.i2cSlave.read8(0x00);
-          if(busy==0){
-            resolve();
-            break;
-          }
-          await shortSleep();
-        };
-      }
-    });
+  readStatus: async function() {
+    if (this.i2cSlave == null) {
+      throw new Error("i2cSlave is not open yet.");
+    }
+
+    const data = await this.i2cSlave.read8(0x00);
+    return data;
   },
-  abort: function(){
-    return new Promise(async (resolve, reject)=>{
-      if(this.i2cSlave == null){
-        reject("i2cSlave Address does'nt yet open!");
-      }else{
-        await this.i2cSlave.write16(0x03,0);
-        resolve();
-      }
-    });
+  move: async function(step) {
+    if (this.i2cSlave == null) {
+      throw new Error("i2cSlave is not open yet.");
+    }
+
+    if (step > 0) {
+      await this.i2cSlave.write16(0x01, step | 0);
+    }
+    if (step < 0) {
+      await this.i2cSlave.write16(0x02, -step | 0);
+    }
+
+    for (;;) {
+      const busy = await this.i2cSlave.read8(0x00);
+      if (busy == 0) return;
+      await sleep(100);
+    }
   },
-  setSpeed: function(speed){
-    return new Promise(async (resolve, reject)=>{
-      if(this.i2cSlave == null){
-        reject("i2cSlave Address does'nt yet open!");
-      }else{
-        await this.i2cSlave.write16(0x04,speed|0);
-        resolve();
-      }
-    });
+  abort: async function() {
+    if (this.i2cSlave == null) {
+      throw new Error("i2cSlave is not open yet.");
+    }
+
+    await this.i2cSlave.write16(0x03, 0);
   },
-  setMinSpeed: function(speed){
-    return new Promise(async (resolve, reject)=>{
-      if(this.i2cSlave == null){
-        reject("i2cSlave Address does'nt yet open!");
-      }else{
-        await this.i2cSlave.write16(0x05,speed);
-        resolve();
-      }
-    });
+  setSpeed: async function(speed) {
+    if (this.i2cSlave == null) {
+      throw new Error("i2cSlave is not open yet.");
+    }
+
+    await this.i2cSlave.write16(0x04, speed | 0);
   },
-  setAccelRate: function(rate){
-    return new Promise(async (resolve, reject)=>{
-      if(this.i2cSlave == null){
-        reject("i2cSlave Address does'nt yet open!");
-      }else{
-        await this.i2cSlave.write16(0x06,rate);
-        resolve();
-      }
-    });
+  setMinSpeed: async function(speed) {
+    if (this.i2cSlave == null) {
+      throw new Error("i2cSlave is not open yet.");
+    }
+
+    await this.i2cSlave.write16(0x05, speed);
   },
-  enable: function(en){
-    return new Promise(async (resolve, reject)=>{
-      if(this.i2cSlave == null){
-        reject("i2cSlave Address does'nt yet open!");
-      }else{
-        await this.i2cSlave.write16(0x07,en?1:0);
-        resolve();
-      }
-    });
+  setAccelRate: async function(rate) {
+    if (this.i2cSlave == null) {
+      throw new Error("i2cSlave is not open yet.");
+    }
+
+    await this.i2cSlave.write16(0x06, rate);
   },
+  enable: async function(en) {
+    if (this.i2cSlave == null) {
+      throw new Error("i2cSlave is not open yet.");
+    }
+
+    await this.i2cSlave.write16(0x07, en ? 1 : 0);
+  }
 };
 
 export default SteppingMotor;
diff --git a/packages/bh1750/bh1750.mjs b/packages/bh1750/bh1750.mjs
index bbc3f5e..a48dfe2 100755
--- a/packages/bh1750/bh1750.mjs
+++ b/packages/bh1750/bh1750.mjs
@@ -30,7 +30,6 @@ var BH1750 = function (i2cPort, slaveAddress) {
 BH1750.prototype = {
 	init: async function(){
 		this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
-		console.log("init ok:"+this.i2cSlave);
 		await this.power_down();
 		await this.set_sensitivity();
 	},
@@ -81,18 +80,15 @@ BH1750.prototype = {
         await this._set_mode(0x40 | (this.mtreg >> 5));
         await this._set_mode(0x60 | (this.mtreg & 0x1f));
         await this.power_down();
-//		console.log("mtreg:",this.mtreg);
 	},
     get_result: async function(){
         // Return current measurement result in lx.
         var data = await this.i2cSlave.readBytes(2);
         var count = data[1]  | data[0]<<8;
-//    	console.log("count:",count);
         var mode2coeff =  1;
     	if (this.mode  == this.ONE_TIME_HIGH_RES_MODE_2 || this.mode  == this.CONTINUOUS_HIGH_RES_MODE_2){
     		mode2coeff = 2;
     	}
-//    	console.log("mode2coeff:",mode2coeff);
         var ratio = 1/(1.2 * (this.mtreg/69.0) * mode2coeff);
     	return (ratio*count);
 	},
@@ -107,7 +103,6 @@ BH1750.prototype = {
 			basetime= 0.03;
 		}
 
-//		console.log("delay:",basetime * (this.mtreg/69.0) + additional,  ":  mode:",(this.mode).toString(16));
         await sleep(1000*(basetime * (this.mtreg/69.0) + additional));
 	},
 	do_measurement: async function(mode, additional_delay){
diff --git a/packages/bme280/bme280.mjs b/packages/bme280/bme280.mjs
index 236075a..a4c47f8 100755
--- a/packages/bme280/bme280.mjs
+++ b/packages/bme280/bme280.mjs
@@ -19,7 +19,6 @@ var BME280 = function(i2cPort,slaveAddress){
 BME280.prototype = {
 	init: async function(){
 		this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
-		console.log("init ok:"+this.i2cSlave);
 		await this.setup();
 		await this.getCalibParam();
 	},
@@ -43,7 +42,6 @@ BME280.prototype = {
 			dat = await this.i2cSlave.read8(ra);
 			calib.push(dat);
 		}
-//		console.log(calib);
 		var digT = this.digT;
 		var digP = this.digP;
 		var digH = this.digH;
@@ -66,15 +64,9 @@ BME280.prototype = {
 		digH.push(getSVal((calib[28]<< 4) | (0x0F & calib[29])));
 		digH.push(getSVal((calib[30]<< 4) | ((calib[29] >> 4) & 0x0F)));
 		digH.push(getSVal( calib[31] ));
-		console.log(digT,digP,digH);
-//		console.log(getSVal(digT[1]),getSVal(digT[2]),getSVal(digP[1]),getSVal(digP[2]),getSVal(digP[3]),getSVal(digP[4]),getSVal(digP[5]),getSVal(digP[6]),getSVal(digP[7]),getSVal(digP[8]));
 	},
-	getSVal: function(val){
-		if ( val & 0x8000 ){
-			return (( -val ^ 0xFFFF) + 1);
-		} else {
-			return ( val );
-		}
+	getSVal: function (val) {
+		return new Int16Array([val])[0];
 	},
 	setup: async function(){
 		var osrs_t = 1; //Temperature oversampling x 1
@@ -117,8 +109,6 @@ BME280.prototype = {
 		v1 = (digP[8] * (((pressure / 8.0) * (pressure / 8.0)) / 8192.0)) / 4096;
 		v2 = ((pressure / 4.0) * digP[7]) / 8192.0;
 		pressure = pressure + ((v1 + v2 + digP[6]) / 16.0)  ;
-
-//		console.log( "pressure : ", (pressure/100)," hPa");
 		return (pressure);
 	},
 	compensate_T: function(adc_T){
@@ -128,7 +118,6 @@ BME280.prototype = {
 		var v2 = (adc_T / 131072.0 - digT[0] / 8192.0) * (adc_T / 131072.0 - digT[0] / 8192.0) * digT[2];
 		t_fine = v1 + v2;
 		var temperature = t_fine / 5120.0;
-//		console.log( "temperature : ",(temperature)," degrees celsius" );
 		return (temperature);
 	},
 	compensate_H: function(adc_H){
@@ -146,7 +135,6 @@ BME280.prototype = {
 		} else if ( var_h < 0.0){
 			var_h = 0.0;
 		}
-//		console.log( "humidity : ", (var_h)," %");
 		return ( var_h );
 	},
 	readData: async function(){
diff --git a/packages/bmp180/bmp180.mjs b/packages/bmp180/bmp180.mjs
index 4b92970..d32a1f9 100755
--- a/packages/bmp180/bmp180.mjs
+++ b/packages/bmp180/bmp180.mjs
@@ -14,13 +14,11 @@ var BMP180 = function(i2cPort,slaveAddress){
 	} else {
 		this.slaveAddress = 0x77;
 	}
-	console.log("this.slaveAddress:",this.slaveAddress);
 };
 
 BMP180.prototype = {
 	init: async function(){
 		this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
-		console.log("init ok:"+this.i2cSlave);
 		await this.getCalibParam();
 	},
 	getSVal: function(val){
@@ -34,7 +32,6 @@ BMP180.prototype = {
 		var calib = [];
 		var dat;
 		var getSVal = this.getSVal;
-		console.log("getCalibParam");
 		for ( var ra = 0xAA ; ra <= 0xAA+21 ; ra++ ){
 			dat = await this.i2cSlave.read8(ra);
 			calib.push(dat);
@@ -53,7 +50,6 @@ BMP180.prototype = {
 		M.push(getSVal((calib[16] << 8) | calib[17])); // MB M[0]
 		M.push(getSVal((calib[18] << 8) | calib[19])); // MC
 		M.push(getSVal((calib[20] << 8) | calib[21])); // MD
-		console.log(AC,B,M);
 	},
 	readAndCalcB5: async function(){
 		var AC = this.AC;
@@ -91,7 +87,6 @@ BMP180.prototype = {
 			dat = await this.i2cSlave.read8(ra);
 			data.push(dat);
 		}
-		console.log("data:",data);
 		var UP = (( (data[0]<<16 ) | (data[1] << 8 ) | data[2]) >> (8 - mode) ) ;
 
 		// Calibration for Pressure
diff --git a/packages/bmp280/bmp280.mjs b/packages/bmp280/bmp280.mjs
index e594978..69e1547 100755
--- a/packages/bmp280/bmp280.mjs
+++ b/packages/bmp280/bmp280.mjs
@@ -19,7 +19,6 @@ var BMP280 = function(i2cPort,slaveAddress){
 BMP280.prototype = {
 	init: async function(){
 		this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
-		console.log("init ok:"+this.i2cSlave);
 		await this.setup();
 		await this.getCalibParam();
 	},
@@ -39,7 +38,6 @@ BMP280.prototype = {
 			dat = await this.i2cSlave.read8(ra);
 			calib.push(dat);
 		}
-//		console.log(calib);
 		var digT = this.digT;
 		var digP = this.digP;
 		var getSVal = this.getSVal;
@@ -55,15 +53,9 @@ BMP280.prototype = {
 		digP.push(getSVal((calib[19]<< 8) | calib[18]));
 		digP.push(getSVal((calib[21]<< 8) | calib[20]));
 		digP.push(getSVal((calib[23]<< 8) | calib[22]));
-		console.log(digT,digP);
-//		console.log(getSVal(digT[1]),getSVal(digT[2]),getSVal(digP[1]),getSVal(digP[2]),getSVal(digP[3]),getSVal(digP[4]),getSVal(digP[5]),getSVal(digP[6]),getSVal(digP[7]),getSVal(digP[8]));
 	},
-	getSVal: function(val){
-		if ( val & 0x8000 ){
-			return (( -val ^ 0xFFFF) + 1);
-		} else {
-			return ( val );
-		}
+	getSVal: function (val) {
+		return new Int16Array([val])[0];
 	},
 	setup: async function(){
 		var osrs_t = 1; //Temperature oversampling x 1
@@ -104,7 +96,6 @@ BMP280.prototype = {
 		v2 = ((pressure / 4.0) * digP[7]) / 8192.0;
 		pressure = pressure + ((v1 + v2 + digP[6]) / 16.0)  ;
 
-//		console.log( "pressure : ", (pressure/100)," hPa");
 		return (pressure);
 	},
 	compensate_T: function(adc_T){
@@ -113,8 +104,6 @@ BMP280.prototype = {
 		var v1 = (adc_T / 16384.0 - digT[0] / 1024.0) * digT[1];
 		var v2 = (adc_T / 131072.0 - digT[0] / 8192.0) * (adc_T / 131072.0 - digT[0] / 8192.0) * digT[2];
 		t_fine = v1 + v2;
-		var temperature = t_fine / 5120.0;
-//		console.log( "temperature : ",(temperature)," degrees celsius" );
 		return (temperature);
 	},
 	readData: async function(){
diff --git a/packages/canzasi/canzasi.mjs b/packages/canzasi/canzasi.mjs
index 73ab087..d110b03 100755
--- a/packages/canzasi/canzasi.mjs
+++ b/packages/canzasi/canzasi.mjs
@@ -1,31 +1,20 @@
-var canzasi = function(i2cPort){
+// @ts-check
+
+var canzasi = function (i2cPort) {
   this.i2cPort = i2cPort;
   this.slaveAddress = 0x30;
   this.i2cSlave = null;
 };
 
 canzasi.prototype = {
-  init: function(){
-    return new Promise((resolve, reject) => {
-      this.i2cPort.open(this.slaveAddress).then((i2cSlave) => {
-        this.i2cSlave = i2cSlave;
-        console.log("i2cPort.open");
-        resolve();
-      });
-    });
+  init: async function () {
+    this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
   },
-  set : function(value){
-    return new Promise((resolve, reject) => {
-      if(this.i2cSlave){
-        this.i2cSlave.writeByte(value).then(() => {
-          resolve();
-        },(error) => {
-          console.log("error"+error);
-        }).catch(reject);
-      }else{
-        console.log("i2cSlave is gone.....");
-      }
-    });
+  set: async function (value) {
+    if (this.i2cSlave == null) {
+      throw new Error("i2cSlave is gone.....");
+    }
+    await this.i2cSlave.writeByte(value);
   }
 };
 
diff --git a/packages/grove-gesture/grove-gesture.mjs b/packages/grove-gesture/grove-gesture.mjs
index 374dd72..75e274a 100755
--- a/packages/grove-gesture/grove-gesture.mjs
+++ b/packages/grove-gesture/grove-gesture.mjs
@@ -68,22 +68,18 @@ PAJ7620.prototype = {
     return new Promise((resolve, reject)=>{
       this.i2cPort.open(this.slaveAddress).then(async (i2cSlave)=>{
         this.i2cSlave = i2cSlave;
-        console.log("i2cPort.open");
         await this.i2cSlave.write8(0xef,0);  // BankSelect=0
         await this.i2cSlave.write8(0xef,0);  // BankSelect=0
 
         var v0 = await this.i2cSlave.read8(0,true);
         var v1 = await this.i2cSlave.read8(1,true);
         if((v0 != 0x20)||(v1 != 0x76)){
-          console.log("read error!");
           reject("init error :v0["+v0+"] v1["+v1+"]");
         }else{
           for(var cnt = 0;cnt <this.initRegisterArray.length;cnt ++){
-//          console.log("thread."+cnt);
             await this.i2cSlave.write8(this.initRegisterArray[cnt][0],this.initRegisterArray[cnt][1]);
           }
           await this.i2cSlave.write8(0xef,0);  // BankSelect=0
-//          console.log("thread2 end");
           resolve();
         }
       });
@@ -125,7 +121,6 @@ PAJ7620.prototype = {
             res = "----";
             break;
           } // switch(v)
-          console.log("res:"+res+" v:"+v);
           resolve(res);
         }).catch(reject);
       }
diff --git a/packages/grove-light/grove-light.mjs b/packages/grove-light/grove-light.mjs
index 69fa9a9..d63e212 100755
--- a/packages/grove-light/grove-light.mjs
+++ b/packages/grove-light/grove-light.mjs
@@ -112,7 +112,6 @@ GROVELIGHT.prototype = {
           reject("value range error");
         }
         var value = this.calculateLux(0, 0, 0);
-        // console.log(this.ch0,this.ch1,value);
         await this.i2cSlave.write8(0x80, 0x00);
         resolve(value);
       }
diff --git a/packages/grove-oled-display/grove-oled-display.mjs b/packages/grove-oled-display/grove-oled-display.mjs
index 70d6370..8f3c429 100755
--- a/packages/grove-oled-display/grove-oled-display.mjs
+++ b/packages/grove-oled-display/grove-oled-display.mjs
@@ -203,9 +203,9 @@ OledDisplay.prototype = {
       }
     }
   },
-  registerQueue: function(mode,param){
-    if(this.sequence != null){
-      console.log("OledDisplay.registerQueue(): error! (now playing)");
+  registerQueue: function (mode, param) {
+    if (this.sequence != null) {
+      console.error("OledDisplay.registerQueue(): error! (now playing)");
       return;
     }
     var obj = {mode: mode, param: param};
@@ -215,7 +215,6 @@ OledDisplay.prototype = {
     return new Promise((resolve, reject) => {
       this.i2cPort.open(OLED_CONST.address).then((i2cSlave) =>{
         this.i2cSlave = i2cSlave;
-        console.log("i2cPort.open");
         this.initQ();
         this.playSequence().then(() => {resolve()});
       });
@@ -227,7 +226,7 @@ OledDisplay.prototype = {
         reject("i2cSlave Address does'nt yet open!");
       }else{
 　　     if(this.sequence != null){
-   　      console.log("OledDisplay.playSequence(): error! (multiple call)");
+   　      console.error("OledDisplay.playSequence(): error! (multiple call)");
     　　　  reject();
     　   }
         this.sequence = setInterval(() => {
@@ -256,7 +255,6 @@ OledDisplay.prototype = {
       if(this.i2cSlave == null){
         reject("i2cSlave Address does'nt yet open!");
       }else{
-        console.log("start clearDisplay");
         this.clearDisplayQ();
         this.playSequence().then(() => {resolve()});
       }
@@ -267,7 +265,6 @@ OledDisplay.prototype = {
       if(this.i2cSlave == null){
         reject("i2cSlave Address does'nt yet open!");
       }else{
-        console.log("start drawString");
         this.drawStringQ(row,col);
         this.playSequence().then(() => {resolve()});
       }
diff --git a/packages/grove-touch/grove-touch.mjs b/packages/grove-touch/grove-touch.mjs
index 87266e3..30f1ef0 100755
--- a/packages/grove-touch/grove-touch.mjs
+++ b/packages/grove-touch/grove-touch.mjs
@@ -1,4 +1,6 @@
-function GroveTouch(i2cPort,address){
+// @ts-check
+
+function GroveTouch(i2cPort, address) {
   this.i2cPort=i2cPort;
   this.i2cSlave= null;
   this.slaveAddress= address;
@@ -18,9 +20,7 @@ GroveTouch.prototype = {
         await this.i2cSlave.write8(0x31,0xff);
         await this.i2cSlave.write8(0x32,0x02);
         for(var i=0;i<12*2;i+=2){
-//          console.log(i);
           var address = 0x41+i;
-//          console.log(address);
           await this.i2cSlave.write8(address,0x0f);
           await this.i2cSlave.write8(address+1,0x0a);
         }
@@ -36,7 +36,6 @@ GroveTouch.prototype = {
         reject("i2cSlave Address does'nt yet open!");
       }else{
         this.i2cSlave.read16(0x00).then((v)=>{
-//          console.log(v);
           var array = [];
           for(var cnt = 0;cnt < 12;cnt ++){
             array.push(((v & (1 << cnt))!=0)?true:false);
diff --git a/packages/ina219/ina219.mjs b/packages/ina219/ina219.mjs
index d34c999..30a898d 100644
--- a/packages/ina219/ina219.mjs
+++ b/packages/ina219/ina219.mjs
@@ -10,7 +10,6 @@ var INA219 = function(i2cPort, slaveAddress) {
   if (!slaveAddress) {
     slaveAddress = 0x40;
   }
-  console.log("slaveAddress:", slaveAddress);
   this.i2cPort = i2cPort;
   this.i2cSlave = null;
   this.slaveAddress = slaveAddress;
@@ -93,7 +92,6 @@ var INA219 = function(i2cPort, slaveAddress) {
 INA219.prototype = {
   init: async function(shunt_ohms, max_expected_amps) {
     this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
-    console.log("i2cSlave:", this.i2cSlave);
     if (shunt_ohms) {
       this._shunt_ohms = shunt_ohms;
     } else {
@@ -139,13 +137,6 @@ INA219.prototype = {
       }
     }
 
-    console.log(
-      "gain set to ",
-      this.__GAIN_VOLTS[this._gain],
-      " auto_gain_enabled:",
-      this._auto_gain_enabled
-    );
-
     await this._calibrate(
       this.__BUS_RANGE[voltage_range],
       this.__GAIN_VOLTS[this._gain],
@@ -202,7 +193,6 @@ INA219.prototype = {
   },
   _determine_gain: function(max_expected_amps) {
     var shunt_v = max_expected_amps * this._shunt_ohms;
-    console.log("_determine_gain:", shunt_v, this.__GAIN_VOLTS[3]);
     if (shunt_v > this.__GAIN_VOLTS[3]) {
       throw " ValueError: " + this.__RNG_ERR_MSG + "," + max_expected_amps;
     }
@@ -210,11 +200,9 @@ INA219.prototype = {
     while (this.__GAIN_VOLTS[gainIndex] > shunt_v) {
       --gainIndex;
     }
-    //		console.log("gain:",gainIndex+1);
     return gainIndex + 1; // 多分これで良いと思うんだけど・・・
   },
   _increase_gain: async function() {
-    console.log(this.__LOG_MSG_3);
     var gain = await this._read_gain();
     if (gain < this.__GAIN_VOLTS.length - 1) {
       gain = gain + 1;
@@ -225,8 +213,7 @@ INA219.prototype = {
       await this._configure_gain(gain);
       await sleep(1);
     } else {
-      console.log("Device limit reach, gain cannot be increased");
-      throw "DeviceRangeError: " + this.__GAIN_VOLTS[gain];
+      throw new Error("DeviceRangeError: " + this.__GAIN_VOLTS[gain]);
     }
   },
   _configure: async function(voltage_range, gain, bus_adc, shunt_adc) {
@@ -243,51 +230,33 @@ INA219.prototype = {
     shunt_volts_max,
     max_expected_amps
   ) {
-    console.log(
-      this.__LOG_MSG_2,
-      bus_volts_max,
-      shunt_volts_max,
-      max_expected_amps
-    );
     var max_possible_amps = shunt_volts_max / this._shunt_ohms;
-    console.log("max possible current:", max_possible_amps);
 
     this._current_lsb = this._determine_current_lsb(
       max_expected_amps,
       max_possible_amps
     );
-    console.log("current LSB: [A/bit]:", this._current_lsb);
 
     this._power_lsb = this._current_lsb * 20;
-    console.log("power LSB: [W/bit]", this._power_lsb);
-
     var max_current = this._current_lsb * 32767;
-    console.log("max current before overflow: ", max_current);
 
     var max_shunt_voltage = max_current * this._shunt_ohms;
-    console.log(
-      "max shunt voltage before overflow: mV ;",
-      max_shunt_voltage * 1000
-    );
 
     var calibration = Math.trunc(
       this.__CALIBRATION_FACTOR / (this._current_lsb * this._shunt_ohms)
     );
-    console.log("calibration: ", calibration);
     await this._calibration_register(calibration);
   },
   _determine_current_lsb: function(max_expected_amps, max_possible_amps) {
-    //		console.log("_determine_current_lsb:",max_expected_amps, max_possible_amps);
     var current_lsb;
     if (max_expected_amps) {
       if (max_expected_amps > max_possible_amps) {
-        throw "ValueError: " +
+        throw new Error("ValueError: " +
           this.__AMP_ERR_MSG +
           " : " +
           max_expected_amps +
           " : " +
-          max_possible_amps;
-        console.log("max expected current: ", max_expected_amps);
+          max_possible_amps);
       }
       if (max_expected_amps < max_possible_amps) {
         current_lsb = max_expected_amps / this.__CURRENT_LSB_FACTOR;
@@ -304,7 +273,6 @@ INA219.prototype = {
     return current_lsb;
   },
   _configuration_register: async function(register_value) {
-    console.log("configuration: ", register_value);
     await this.__write_register(this.__REG_CONFIG, register_value);
   },
   _read_configuration: async function() {
@@ -319,7 +287,6 @@ INA219.prototype = {
   _read_gain: async function() {
     var configuration = await this._read_configuration();
     var gain = (configuration & 0x1800) >> this.__PG0;
-    console.log("gain is currently: V", this.__GAIN_VOLTS[gain]);
     return gain;
   },
   _configure_gain: async function(gain) {
@@ -327,10 +294,8 @@ INA219.prototype = {
     configuration = configuration & 0xe7ff;
     await this._configuration_register(configuration | (gain << this.__PG0));
     this._gain = gain;
-    console.log("gain set to: V:", this.__GAIN_VOLTS[gain]);
   },
   _calibration_register: async function(register_value) {
-    console.log("calibration: ", register_value);
     await this.__write_register(this.__REG_CALIBRATION, register_value);
   },
   _has_current_overflow: async function() {
@@ -359,13 +324,6 @@ INA219.prototype = {
     }
   },
   __write_register: async function(register, register_value) {
-    var register_bytes = this.__to_bytes(register_value);
-    console.log(
-      "write register :",
-      register,
-      register_value,
-      register_value.toString(2)
-    );
     // write16 is little endian
     var bl = register_value & 0xff;
     var bh = register_value >>> 8;
@@ -386,7 +344,6 @@ INA219.prototype = {
       }
     } else {
     }
-    //		console.log("read register :", register, register_value,register_value.toString(2));
     return register_value;
   },
   __to_bytes: function(register_value) {
diff --git a/packages/mpu6050/mpu6050.mjs b/packages/mpu6050/mpu6050.mjs
index 6e01e92..e8859e2 100755
--- a/packages/mpu6050/mpu6050.mjs
+++ b/packages/mpu6050/mpu6050.mjs
@@ -14,16 +14,13 @@ var MPU6050 = function(i2cPort,slaveAddress){
 MPU6050.prototype = {
 	init: async function(){
 		this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
-//        console.log("init ok:"+this.i2cSlave);
 		await this.i2cSlave.write8(0x6b,0x00);
-		console.log("init ok:"+this.i2cSlave);
 	},
 	readTemp: async function(){
 		if(this.i2cSlave == null){
 			throw Error("i2cSlave Address does'nt yet open!");
 		}
 		var ans = await this.i2cSlave.read16(0x41);
-		console.log(ans);
 //         var data = ((MSB << 8) + LSB)/128.0;
 		var temp = ans / 340 + 36.53;
 		return(temp);
@@ -33,7 +30,6 @@ MPU6050.prototype = {
 			throw Error("i2cSlave Address does'nt yet open!");
 		}
 		var ans = await this.i2cSlave.read16(0x41);
-//		console.log("tmpW:",ans);
 		var temp = this.getVal(ans) / 340 + 36.53;
 		ans = await this.i2cSlave.read16(0x43);
 		var rx = this.getVal(ans) / 131;
@@ -47,7 +43,6 @@ MPU6050.prototype = {
 		var gy = this.getVal(ans) / 16384;
 		ans = await this.i2cSlave.read16(0x3f);
 		var gz = this.getVal(ans) / 16384;
-		console.log("t:",temp,"  rxyz:",rz,ry,rz,"  gxyz:",gx,gy,gz);
 		return({
 			temperature: temp,
 			gx: gx,
@@ -73,13 +68,8 @@ MPU6050.prototype = {
 	getVal: function( w ){
 		var l = w >>> 8;
 		var b = w & 0xff;
-		var v = l + ( b << 8 );
-//		console.log("Val:",w.toString(16),b.toString(16),l.toString(16),v.toString(16),b,l,v);
-		if ( v >= 0x8000 ){
-			return ( - ((65535 - v ) + 1 ) );
-		} else {
-			return(v);
-		}
+		var v = l + (b << 8);
+		return new Int16Array([v])[0];
 	}
 };
 
diff --git a/packages/mpu6500/mpu6500.mjs b/packages/mpu6500/mpu6500.mjs
index 2e0bfc1..cf8fce7 100755
--- a/packages/mpu6500/mpu6500.mjs
+++ b/packages/mpu6500/mpu6500.mjs
@@ -1,3 +1,4 @@
+// @ts-check
 // MPU 6500 driver
 // Ported from
 // https://raw.githubusercontent.com/tuupola/micropython-mpu9250/master/mpu6500.py
@@ -91,44 +92,35 @@ MPU6500.prototype = {
 
 		this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
 		var whoamiVal = await this.i2cSlave.read8(cs._WHO_AM_I);
-		if ( whoamiVal ==0x70){
-			console.log("This device is MPU6500");
-		} else if ( whoamiVal ==0x71){
-			console.log("This device is MPU9250");
-		} else if ( whoamiVal ==0x73){
+		if (whoamiVal == 0x70) {
+			// This device is MPU6500
+		} else if (whoamiVal == 0x71) {
+			// This device is MPU9250
+		} else if (whoamiVal == 0x73) {
 			// https://github.com/kriswiner/MPU9250/issues/47
-			console.log("This device is MPU9255");
+			// This device is MPU9255
 		} else {
-			console.log("This device is NOT Supported...");
-			return(null);
+			console.error("This device is NOT Supported...");
+			return null;
 		}
 
 		cs._accel_so = await this._accel_fs(accel_fs);
 		cs._gyro_so = await this._gyro_fs(gyro_fs);
 		cs._accel_sf = accel_sf;
 		cs._gyro_sf = gyro_sf;
-		console.log("init ok:"+this.i2cSlave+ "  constant:",cs);
-
-//		await this.i2cSlave.write8(0x6B, 0x00); // clear power management
 
 		// # Enable I2C bypass to access for MPU9250 magnetometer access.
 		var chr = await this.i2cSlave.read8(cs._INT_PIN_CFG);
-		console.log("bypass:",chr);
 		chr &= ~cs._I2C_BYPASS_MASK; //# clear I2C bits
 		chr |= cs._I2C_BYPASS_EN;
-		console.log("bypass_:",chr);
 		await this.i2cSlave.write8(cs._INT_PIN_CFG, chr);
-		console.log("init2 ok:");
-
 	},
 
 	_accel_fs: async function(value){
 		var cs = this.devConst;
 		await this.i2cSlave.write8(cs._ACCEL_CONFIG, value);
-		console.log("_accel_fs:",value);
 		//# Return the sensitivity divider
 		if (cs.ACCEL_FS_SEL_2G == value){
-			console.log("ACCEL_FS_SEL_2G::sel");
 			return cs._ACCEL_SO_2G;
 		} else if (cs.ACCEL_FS_SEL_4G == value){
 			return cs._ACCEL_SO_4G;
@@ -169,7 +161,6 @@ MPU6500.prototype = {
 		var x = this.getVal(await this.i2cSlave.read16(cs._ACCEL_XOUT_H));
 		var y = this.getVal(await this.i2cSlave.read16(cs._ACCEL_YOUT_H));
 		var z = this.getVal(await this.i2cSlave.read16(cs._ACCEL_ZOUT_H));
-		console.log("acc:",x,y,z,"  addr:",cs._ACCEL_XOUT_H,"  sosf:",so,sf);
 		return {
 			x: x / so * sf,
 			y: y / so * sf,
@@ -188,7 +179,6 @@ MPU6500.prototype = {
 		var x = this.getVal(await this.i2cSlave.read16(cs._GYRO_XOUT_H));
 		var y = this.getVal(await this.i2cSlave.read16(cs._GYRO_YOUT_H));
 		var z = this.getVal(await this.i2cSlave.read16(cs._GYRO_ZOUT_H));
-		console.log("gyr:",x,y,z,"  addr:",cs._GYRO_XOUT_H,"  sosf:",so,sf);
 		return {
 			x: x / so * sf,
 			y: y / so * sf,
@@ -199,12 +189,7 @@ MPU6500.prototype = {
 		var l = w >>> 8;
 		var b = w & 0xff;
 		var v = l + ( b << 8 );
-//		console.log("Val:",w.toString(16),b.toString(16),l.toString(16),v.toString(16),b,l,v);
-		if ( v >= 0x8000 ){
-			return ( - ((65535 - v ) + 1 ) );
-		} else {
-			return(v);
-		}
+		return new Int16Array([v])[0];
 	}
 };
 
diff --git a/packages/neopixel-i2c/neopixel-i2c.mjs b/packages/neopixel-i2c/neopixel-i2c.mjs
index de69135..51fec1a 100755
--- a/packages/neopixel-i2c/neopixel-i2c.mjs
+++ b/packages/neopixel-i2c/neopixel-i2c.mjs
@@ -1,3 +1,4 @@
+// @ts-check
 // Driver for https://github.com/usedbytes/neopixel_i2c
 // Programmed by Satoru Takagi
 
diff --git a/packages/pca9685-pwm/pca9685-pwm.mjs b/packages/pca9685-pwm/pca9685-pwm.mjs
index 96af4f3..b9425a9 100755
--- a/packages/pca9685-pwm/pca9685-pwm.mjs
+++ b/packages/pca9685-pwm/pca9685-pwm.mjs
@@ -20,7 +20,7 @@ PCA9685_PWM.prototype = {
     // angleRange : -angleRange to +angleRange degrees
 
     if (this.frequency) {
-      console.log("alredy initialised");
+      console.error("alredy initialised");
     }
     if (frequency) {
       this.frequency = frequency;
@@ -30,7 +30,7 @@ PCA9685_PWM.prototype = {
     var freq = Math.floor(25000000 / (4096 * this.frequency) - 1);
 
     if (freq < 0x03 || freq > 0xff) {
-      throw Error("Frequency should be between 24Hz to 1526Hz");
+      throw new Error("Frequency should be between 24Hz to 1526Hz");
     }
 
     var i2cSlave = await this.i2cPort.open(this.slaveAddress);
@@ -52,17 +52,16 @@ PCA9685_PWM.prototype = {
   },
   setPWM: async function(pwmPort, dutyRatio) {
     // dutyRatio : 0.0(OFF) .. 1.0(ON)
-    // console.log(pwmPort,angle)
     const portStart = 8;
     const portInterval = 4;
     if (this.i2cSlave == null) {
-      throw Error("i2cSlave Address does'nt yet open!");
+      throw new Error("i2cSlave Address does'nt yet open!");
     }
     if (pwmPort < 0 || pwmPort > 15) {
-      throw Error("PWM Port should be between 0 to 15");
+      throw new Error("PWM Port should be between 0 to 15");
     }
     if (dutyRatio < 0 || dutyRatio > 1) {
-      throw Error("dutyRatio should be between 0.0 to 1.0");
+      throw new Error("dutyRatio should be between 0.0 to 1.0");
     }
     var ticks = Math.floor(4095 * dutyRatio);
     var tickH = (ticks >> 8) & 0x0f;
diff --git a/packages/pca9685/pca9685.mjs b/packages/pca9685/pca9685.mjs
index e39a97b..07048d2 100755
--- a/packages/pca9685/pca9685.mjs
+++ b/packages/pca9685/pca9685.mjs
@@ -12,21 +12,19 @@ PCA9685.prototype = {
     return new Promise((resolve)=>{setTimeout(resolve,ms);});
   },
   init: function(minPulse,maxPulse,angleRange,noSetZero){
-  // minPulse,maxPulse: in sec
-  // angleRange : -angleRange to +angleRange degrees
+    // minPulse,maxPulse: in sec
+    // angleRange : -angleRange to +angleRange degrees
     if(this.minPulse && this.maxPulse && this.angleRange){
-      console.log("alredy set param");
+      console.error("alredy set param");
     }
     if(minPulse && maxPulse && angleRange){
       this.minPulse = minPulse;
       this.maxPulse = maxPulse;
       this.angleRange = angleRange;
-//      console.log("set servo setting.");
-    }else{
+    } else {
       this.minPulse = 0.0011;
       this.maxPulse = 0.0019;
       this.angleRange = 30.0;
-//      console.log("set defaul servo setting.");
     }
 
     return new Promise((resolve, reject)=>{
@@ -51,7 +49,6 @@ PCA9685.prototype = {
     });
   },
   setServo: function(servoPort,angle){
-//    console.log(servoPort,angle)
     const portStart = 8;
     const portInterval = 4;
     const freq = 61; // Hz
@@ -63,13 +60,12 @@ PCA9685.prototype = {
       maxPulse = this.maxPulse;
       pulseRange = maxPulse - minPulse;
       angleRange = this.angleRange;
-//      console.log(minPulse,maxPulse,angleRange,pulseRange);
     }else{
-      console.log("wrong param.");
+      throw new Error("wrong param.");
     }
-    if ( angle < -angleRange){
+    if (angle < -angleRange) {
         angle = -angleRange;
-    } else if ( angle > angleRange ){
+    } else if (angle > angleRange) {
         angle = angleRange;
     }
     if ( servoPort < 0){
@@ -79,7 +75,6 @@ PCA9685.prototype = {
     }
 
     var pulse = ((minPulse + maxPulse) + angle / angleRange * pulseRange ) / 2.0;
-    console.log("pulse:",pulse*1000," msec");
     var ticks = Math.round(pulse / tickSec);
 
     var tickH = (( ticks >> 8 ) & 0x0f);
diff --git a/packages/pcf8591/pcf8591.mjs b/packages/pcf8591/pcf8591.mjs
index e22174c..1b76098 100755
--- a/packages/pcf8591/pcf8591.mjs
+++ b/packages/pcf8591/pcf8591.mjs
@@ -1,3 +1,4 @@
+// @ts-check
 // PCF8591 driver for CHIRIMEN raspberry pi3
 // 4ch 8bit ADC, 1ch 8bit DAC
 // CDS, Thermister, VR and a LED
@@ -28,9 +29,8 @@ PCF8591.prototype = {
 		}
 	},
 	setDAC: async function(vl){
-		var dav = Math.floor( 0xff * vl / this.refV ) & 0xff;
-		console.log("setDAC:",dav);
-		await this.i2cSlave.write8( 0x40, dav );
+		var dav = Math.floor(0xff * vl / this.refV) & 0xff;
+		await this.i2cSlave.write8(0x40, dav);
 	}
 };
 
diff --git a/packages/s11059/s11059.mjs b/packages/s11059/s11059.mjs
index b95900f..15e9325 100755
--- a/packages/s11059/s11059.mjs
+++ b/packages/s11059/s11059.mjs
@@ -1,4 +1,6 @@
-var S11059 = function(i2cPort,slaveAddress) {
+// @ts-check
+
+var S11059 = function (i2cPort, slaveAddress) {
   this.i2cPort = i2cPort;
   this.i2cSlave = null;
   this.slaveAddress = slaveAddress;
diff --git a/packages/sht30/sht30.mjs b/packages/sht30/sht30.mjs
index efd63d2..b4d5aaa 100755
--- a/packages/sht30/sht30.mjs
+++ b/packages/sht30/sht30.mjs
@@ -1,8 +1,12 @@
+// @ts-check
 // SHT30 driver for CHIRIMEN raspberry pi3
 // Temperature and Humidity I2C Sensor
 // based on https://github.com/ControlEverythingCommunity/SHT30/blob/master/Python/SHT30.py
 // Programmed by Satoru Takagi
 
+/** @param {number} ms Delay for a number of milliseconds. */
+const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
+
 var SHT30 = function(i2cPort,slaveAddress){
 	if (!slaveAddress){
 		slaveAddress = 0x44;
@@ -15,18 +19,15 @@ var SHT30 = function(i2cPort,slaveAddress){
 SHT30.prototype = {
 	init: async function(){
 		this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
-
 	},
 	readData: async function(){
 		await this.i2cSlave.write8(0x2C, 0x06); // High repeatability measurement
 		await sleep(100); // wait for measurement?
 		var mdata = await this.i2cSlave.readBytes(6); // prev data..
-		console.log("rawData:",mdata);
 		// cTemp MSB, cTemp LSB, cTemp CRC, Humididty MSB, Humidity LSB, Humidity CRC
-		cTemp = ((((mdata[0] * 256.0) + mdata[1]) * 175) / 65535.0) - 45; // celsius
-		fTemp = cTemp * 1.8 + 32; // f
-		humidity = 100 * (mdata[3] * 256 + mdata[4]) / 65535.0;
-//		console.log("t:",cTemp," h:",humidity);
+		var cTemp = ((((mdata[0] * 256.0) + mdata[1]) * 175) / 65535.0) - 45; // celsius
+		var fTemp = cTemp * 1.8 + 32; // f
+		var humidity = 100 * (mdata[3] * 256 + mdata[4]) / 65535.0;
 		return {
 			humidity: humidity,
 			temperature: cTemp
diff --git a/packages/tcs34725/tcs34725.mjs b/packages/tcs34725/tcs34725.mjs
index a8975f0..1223b55 100755
--- a/packages/tcs34725/tcs34725.mjs
+++ b/packages/tcs34725/tcs34725.mjs
@@ -44,11 +44,9 @@ TCS34725.prototype = {
 		this._active = false;
 		this.integration_time(2.4);
 		var sensor_id = await this.sensor_id();
-		console.log("TCS34725 sensor_id: 0x",sensor_id.toString(16));
 	},
 
 	active: async function(value){
-//		console.log("active:",value);
 		if (value == undefined ){
 			return this._active;
 		}
@@ -93,11 +91,11 @@ TCS34725.prototype = {
 				break;
 			}
 		}
-		if ( index == -1 ){
-			console.log("gain must be 1, 4, 16 or 60");
-			return ( false );
+		if (index == -1) {
+			console.error("gain must be 1, 4, 16 or 60");
+			return false;
 		}
-        this.i2cSlave.write8(this._REGISTER_CONTROL | this._COMMAND_BIT, index);
+    await this.i2cSlave.write8(this._REGISTER_CONTROL | this._COMMAND_BIT, index);
 	},
 	_valid: async function(){
 		var v = await this.i2cSlave.read8(this._REGISTER_STATUS | this._COMMAND_BIT);
@@ -139,24 +137,6 @@ TCS34725.prototype = {
 			lux: y
 		};
 	},
-	/**
-	readData: async function(){
-		await this.i2cSlave.write8(0x2C, 0x06); // High repeatability measurement
-		await sleep(100); // wait for measurement?
-		var mdata = await this.i2cSlave.readBytes(6); // prev data..
-		console.log("rawData:",mdata);
-		// cTemp MSB, cTemp LSB, cTemp CRC, Humididty MSB, Humidity LSB, Humidity CRC
-		cTemp = ((((mdata[0] * 256.0) + mdata[1]) * 175) / 65535.0) - 45; // celsius
-		fTemp = cTemp * 1.8 + 32; // f
-		humidity = 100 * (mdata[3] * 256 + mdata[4]) / 65535.0;
-//		console.log("t:",cTemp," h:",humidity);
-		return {
-			humidity: humidity,
-			temperature: cTemp
-		}
-
-	}
-	**/
 };
 
 export default TCS34725;
diff --git a/packages/vl53l0x/vl53l0x.mjs b/packages/vl53l0x/vl53l0x.mjs
index 7b06f2a..04deafb 100755
--- a/packages/vl53l0x/vl53l0x.mjs
+++ b/packages/vl53l0x/vl53l0x.mjs
@@ -585,12 +585,8 @@ VL53L0X.prototype = {
     var data = ((MSB << 8) + LSB) / 128.0;
     return data;
   },
-  getSVal: function(val) {
-    if (val & 0x8000) {
-      return (-val ^ 0xffff) + 1;
-    } else {
-      return val;
-    }
+  getSVal: function (val) {
+    return new Int16Array([val])[0];
   },
   setVcselPulsePeriod: async function(vcselPeriodType, period_pclks) {
     // for longRangeMode init()
diff --git a/packages/vl53l1x/vl53l1x.mjs b/packages/vl53l1x/vl53l1x.mjs
index 6a75055..a11d459 100755
--- a/packages/vl53l1x/vl53l1x.mjs
+++ b/packages/vl53l1x/vl53l1x.mjs
@@ -1218,9 +1218,7 @@ VL53L1X.prototype = {
     this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
     await sleep(10);
     if ((await this.readReg16Bit(this.IDENTIFICATION__MODEL_ID)) != 0xeacc) {
-      throw "Failed to find expected ID register values. Check wiring!";
-    } else {
-      console.log("OK! Is VL53L1X");
+      throw new Error("Failed to find expected ID register values. Check wiring!");
     }
 
     // VL53L1_software_reset() begin
@@ -1259,7 +1257,6 @@ VL53L1X.prototype = {
     this.osc_calibrate_val = await this.readReg16Bit(
       this.RESULT__OSC_CALIBRATE_VAL
     );
-    //		console.log(this.fast_osc_frequency,this.osc_calibrate_val);
 
     // VL53L1_DataInit() end
 
@@ -1359,8 +1356,6 @@ VL53L1X.prototype = {
       (await this.readReg16Bit(this.MM_CONFIG__OUTER_OFFSET_MM)) * 4
     );
 
-    console.log("VL53L1X Init completed : ");
-
     return true;
   },
 
@@ -1423,7 +1418,6 @@ VL53L1X.prototype = {
 	  }
 		**/
     await this.readResults();
-    //		console.log("readResults end:",this.results);
     if (!this.calibrated) {
       this.setupManualCalibration();
       this.calibrated = true;
@@ -1434,7 +1428,6 @@ VL53L1X.prototype = {
     await this.getRangingData();
 
     await this.writeReg(this.SYSTEM__INTERRUPT_CLEAR, 0x01); // sys_interrupt_clear_range
-    //console.log("STAT:",this.ranging_data.range_status);
 
     return this.ranging_data.range_mm;
   },
@@ -1447,7 +1440,6 @@ VL53L1X.prototype = {
 
     switch (mode) {
       case "short":
-        console.log("ShortMode");
         // from VL53L1_preset_mode_standard_ranging_short_range()
         // timing config
         await this.writeReg(this.RANGE_CONFIG__VCSEL_PERIOD_A, 0x07);
@@ -1460,7 +1452,6 @@ VL53L1X.prototype = {
         await this.writeReg(this.SD_CONFIG__INITIAL_PHASE_SD1, 6); // tuning parm default
         break;
       case "medium":
-        console.log("MediumMode");
         // from VL53L1_preset_mode_standard_ranging()
         // timing config
         await this.writeReg(this.RANGE_CONFIG__VCSEL_PERIOD_A, 0x0b);
@@ -1473,7 +1464,6 @@ VL53L1X.prototype = {
         await this.writeReg(this.SD_CONFIG__INITIAL_PHASE_SD1, 10); // tuning parm default
         break;
       case "long": // long
-        console.log("LongMode");
         // from VL53L1_preset_mode_standard_ranging_long_range()
         // timing config
         await this.writeReg(this.RANGE_CONFIG__VCSEL_PERIOD_A, 0x0f);
@@ -1491,7 +1481,6 @@ VL53L1X.prototype = {
     }
     // reapply timing budget
     await this.setMeasurementTimingBudget(budget_us);
-    //		console.log("budget_us:",budget_us);
     // save mode so it can be returned by getDistanceMode()
     this.distance_mode = mode;
     return true;
@@ -1618,15 +1607,12 @@ VL53L1X.prototype = {
   checkForDataReady: async function() {
     var IntPol = await this.getInterruptPolarity();
     var Temp = await this.readReg(this.GPIO__TIO_HV_STATUS);
-    //		console.log("IntPol,GPIO__TIO_HV_STATUS : ",IntPol,Temp);
     var isDataReady = (Temp & 1) == IntPol ? 1 : 0;
     return isDataReady;
   },
   getInterruptPolarity: async function() {
     var Temp = await this.readReg(this.GPIO_HV_MUX__CTRL);
     Temp = Temp & 0x10;
-    //		console.log("getInterruptPolarity:",Temp);
-    //		return( !(Temp>>4));
     var ans;
     if (Temp >> 4 == 0) {
       ans = 1;
@@ -1669,15 +1655,12 @@ VL53L1X.prototype = {
   },
   // read measurement results into buffer
   readResults: async function() {
-    //console.log("readResults:",(this.RESULT__RANGE_STATUS >>> 8).toString(16), (this.RESULT__RANGE_STATUS & 0xFF).toString(16));
     await this.i2cSlave.writeBytes([
       this.RESULT__RANGE_STATUS >>> 8,
       this.RESULT__RANGE_STATUS & 0xff
     ]);
     var readData = await this.i2cSlave.readBytes(17);
 
-    //console.log("readData:",readData);
-
     //  last_status = Wire.endTransmission();
 
     this.results.range_status = readData[0];
@@ -1886,22 +1869,18 @@ VL53L1X.prototype = {
   readReg: async function(addr16) {
     await this.i2cSlave.writeBytes([addr16 >>> 8, addr16 & 0xff]);
     var dat = await this.i2cSlave.readBytes(1);
-    //		console.log("readReg16Bit:",addr16.toString(16),ans.toString(16),":",(addr16 >>> 8).toString(16), (addr16 & 0xFF).toString(16), (dat[0]).toString(16), (dat[1]).toString(16));
     return dat;
   },
   readReg16Bit: async function(addr16) {
     await this.i2cSlave.writeBytes([addr16 >>> 8, addr16 & 0xff]);
     var dat = await this.i2cSlave.readBytes(2);
     var ans = (dat[0] << 8) + dat[1];
-    //		console.log("readReg16Bit:",addr16.toString(16),ans.toString(16),":",(addr16 >>> 8).toString(16), (addr16 & 0xFF).toString(16), (dat[0]).toString(16), (dat[1]).toString(16));
     return ans;
   },
   writeReg: async function(addr16, dat8) {
-    //		console.log("writeReg8Bit:",addr16.toString(16),dat16.toString(16),":",(addr16 >>> 8).toString(16), (addr16 & 0xFF).toString(16), (dat16>>>8).toString(16), (dat16 & 0xFF).toString(16));
     await this.i2cSlave.writeBytes([addr16 >>> 8, addr16 & 0xff, dat8 & 0xff]);
   },
   writeReg16Bit: async function(addr16, dat16) {
-    //		console.log("writeReg16Bit:",addr16.toString(16),dat16.toString(16),":",(addr16 >>> 8).toString(16), (addr16 & 0xFF).toString(16), (dat16>>>8).toString(16), (dat16 & 0xFF).toString(16));
     await this.i2cSlave.writeBytes([
       addr16 >>> 8,
       addr16 & 0xff,
@@ -1910,7 +1889,6 @@ VL53L1X.prototype = {
     ]);
   },
   writeReg32Bit: async function(addr16, dat32) {
-    //		console.log("writeReg32Bit:",addr16.toString(16),dat32.toString(16),":",(addr16 >>> 8).toString(16), (addr16 & 0xFF).toString(16), (dat32>>>24).toString(16), (dat32>>>16 & 0xFF).toString(16) , (dat32>>>8 & 0xFF).toString(16), (dat32 & 0xFF).toString(16));
     await this.i2cSlave.writeBytes([
       addr16 >>> 8,
       addr16 & 0xff,