diff --git a/examples/adxl345/index.html b/examples/adxl345/index.html
index cdd57de..2412b65 100755
--- a/examples/adxl345/index.html
+++ b/examples/adxl345/index.html
@@ -7,9 +7,8 @@
       content="width=device-width, user-scalable=no, initial-scale=1"
     />
     <title>Grove Digital Accelerometer sensor</title>
-    <script src="node_modules/@chirimen-raspi/polyfill/polyfill.js"></script>
-    <script src="node_modules/@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer/GROVEACCELEROMETER.js"></script>
-    <script src="./main.js" defer></script>
+    <script src="https://r.chirimen.org/polyfill.js"></script>
+    <script src="./main.js" type="module"></script>
     <style>
       p {
         color: blue;
diff --git a/examples/adxl345/main.js b/examples/adxl345/main.js
index cbb0012..ee37b8c 100755
--- a/examples/adxl345/main.js
+++ b/examples/adxl345/main.js
@@ -1,21 +1,23 @@
+import GROVEACCELEROMETER from "https://unpkg.com/@chirimen/grove-accelerometer?module";
+
 main();
 
 async function main() {
-  var ax = document.getElementById("ax");
-  var ay = document.getElementById("ay");
-  var az = document.getElementById("az");
-  var i2cAccess = await navigator.requestI2CAccess();
-  var port = i2cAccess.ports.get(1);
-  var groveaccelerometer = new GROVEACCELEROMETER(port, 0x53);
+  const ax = document.getElementById("ax");
+  const ay = document.getElementById("ay");
+  const az = document.getElementById("az");
+  const i2cAccess = await navigator.requestI2CAccess();
+  const port = i2cAccess.ports.get(1);
+  const groveaccelerometer = new GROVEACCELEROMETER(port, 0x53);
   await groveaccelerometer.init();
   for (;;) {
     try {
-      var values = await groveaccelerometer.read();
+      const values = await groveaccelerometer.read();
       ax.innerHTML = values.x ? values.x : ax.innerHTML;
       ay.innerHTML = values.y ? values.y : ay.innerHTML;
       az.innerHTML = values.z ? values.z : az.innerHTML;
     } catch (err) {
-      console.log("READ ERROR:" + err);
+      console.error("READ ERROR:" + err);
     }
     await sleep(1000);
   }
diff --git a/examples/adxl345/node_modules/@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer/GROVEACCELEROMETER.js b/examples/adxl345/node_modules/@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer/GROVEACCELEROMETER.js
deleted file mode 100755
index a218896..0000000
--- a/examples/adxl345/node_modules/@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer/GROVEACCELEROMETER.js
+++ /dev/null
@@ -1,57 +0,0 @@
-var GROVEACCELEROMETER = function(i2cPort,slaveAddress){
-  this.i2cPort = i2cPort;
-  this.i2cSlave = null;
-  this.slaveAddress = slaveAddress;
-};
-
-GROVEACCELEROMETER.prototype = {
-  EARTH_GRAVITY_MS2:9.80665,
-  SCALE_MULTIPLIER:0.0039,
-  init: function(){
-    return new Promise((resolve, reject)=>{
-      this.i2cPort.open(this.slaveAddress).then(async (i2cSlave)=>{
-        await i2cSlave.write8(0x2d,0x00); // stop sample
-        await i2cSlave.write8(0x31,0x08); // FULL_RES , +/-2g
-        await i2cSlave.write8(0x2d,0x08); // start 8Hz sample
-        this.i2cSlave = i2cSlave;
-        resolve();
-      },(err)=>{
-        reject(err);
-      });
-    });
-  },
-  read: function(){
-    return new Promise(async (resolve, reject)=>{
-      if(this.i2cSlave == null){
-        reject("i2cSlave Address does'nt yet open!");
-      }else{
-        await this.i2cSlave.writeByte(0x32);
-        this.i2cSlave.readBytes(6).then((v)=>{
-          var x = v[0] + (v[1] << 8);
-          if(x & (1 << 16 - 1)){x = x - (1<<16);}
-          var y = v[2] + (v[3] << 8);
-          if(y & (1 << 16 - 1)){y = y - (1<<16);}
-          var z = v[4] + (v[5] << 8);
-          if(z & (1 << 16 - 1)){z = z - (1<<16);}
-            
-          x = x*this.SCALE_MULTIPLIER;
-          y = y*this.SCALE_MULTIPLIER;
-          z = z*this.SCALE_MULTIPLIER;
-          x = x*this.EARTH_GRAVITY_MS2;
-          y = y*this.EARTH_GRAVITY_MS2;
-          z = z*this.EARTH_GRAVITY_MS2;
-            
-          x=Math.round(x*10000)/10000;
-          y=Math.round(y*10000)/10000;
-          z=Math.round(z*10000)/10000;
-        
-          var values = {"x": x, "y": y, "z": z};
-          resolve(values);
-        },(err)=>{
-          reject(err);
-
-        });
-      }
-    });  
-  }
-};
diff --git a/examples/adxl345/node_modules/@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer/package.json b/examples/adxl345/node_modules/@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer/package.json
deleted file mode 100644
index 9526be2..0000000
--- a/examples/adxl345/node_modules/@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer/package.json
+++ /dev/null
@@ -1,45 +0,0 @@
-{
-  "_from": "@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer",
-  "_id": "@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer@1.0.0",
-  "_inBundle": false,
-  "_integrity": "sha512-j+M8zyNa/+vmAX9LH0ov+C/IsoEyGRY0cEz1K9cu2V1bNKPXM5KaIAL7gdoYl8FwgJJWMr9ojtv5cVQPQQ/2yA==",
-  "_location": "/@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer",
-  "_phantomChildren": {},
-  "_requested": {
-    "type": "tag",
-    "registry": true,
-    "raw": "@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer",
-    "name": "@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer",
-    "escapedName": "@chirimen-raspi%2fchirimen-driver-i2c-grove-accelerometer",
-    "scope": "@chirimen-raspi",
-    "rawSpec": "",
-    "saveSpec": null,
-    "fetchSpec": "latest"
-  },
-  "_requiredBy": [
-    "#USER",
-    "/"
-  ],
-  "_resolved": "https://registry.npmjs.org/@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer/-/chirimen-driver-i2c-grove-accelerometer-1.0.0.tgz",
-  "_shasum": "66182977ee5c64fced82aff4118e39be2b7ad376",
-  "_spec": "@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer",
-  "_where": "/home/kou029w/chirimen-raspi3/gc/i2c/i2c-grove-accelerometer",
-  "bugs": {
-    "url": "https://github.com/chirimen-oh/chirimen-drivers/issues"
-  },
-  "bundleDependencies": false,
-  "deprecated": false,
-  "gitHead": "c5f38d95e39d9d3e64ec9f2e0223fc6f1cf305ae",
-  "homepage": "https://github.com/chirimen-oh/chirimen-drivers#readme",
-  "license": "MIT",
-  "main": "GROVEACCELEROMETER.js",
-  "name": "@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer",
-  "publishConfig": {
-    "access": "public"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/chirimen-oh/chirimen-drivers.git"
-  },
-  "version": "1.0.0"
-}
diff --git a/examples/adxl345/node_modules/@chirimen-raspi/polyfill/package.json b/examples/adxl345/node_modules/@chirimen-raspi/polyfill/package.json
deleted file mode 100644
index bf7a3da..0000000
--- a/examples/adxl345/node_modules/@chirimen-raspi/polyfill/package.json
+++ /dev/null
@@ -1,34 +0,0 @@
-{
-  "_from": "@chirimen-raspi/polyfill@^1.0.1",
-  "_id": "@chirimen-raspi/polyfill@1.0.1",
-  "_inBundle": false,
-  "_integrity": "sha512-XMNwF/ECJk6MRfaIYblaiJQi49zpwrZFu5DdC1fJqHYethCcOnKr/bgesw2Rfftld4HMclx+4sXyxQo0bY0bZA==",
-  "_location": "/@chirimen-raspi/polyfill",
-  "_phantomChildren": {},
-  "_requested": {
-    "type": "range",
-    "registry": true,
-    "raw": "@chirimen-raspi/polyfill@^1.0.1",
-    "name": "@chirimen-raspi/polyfill",
-    "escapedName": "@chirimen-raspi%2fpolyfill",
-    "scope": "@chirimen-raspi",
-    "rawSpec": "^1.0.1",
-    "saveSpec": null,
-    "fetchSpec": "^1.0.1"
-  },
-  "_requiredBy": [
-    "/"
-  ],
-  "_resolved": "https://registry.npmjs.org/@chirimen-raspi/polyfill/-/polyfill-1.0.1.tgz",
-  "_shasum": "3f5441ef1a4e02cac2b41dadc8fabd56fcbd8e04",
-  "_spec": "@chirimen-raspi/polyfill@^1.0.1",
-  "_where": "/home/kou029w/chirimen-raspi3/gc/i2c/i2c-grove-accelerometer",
-  "bundleDependencies": false,
-  "deprecated": false,
-  "main": "polyfill.js",
-  "name": "@chirimen-raspi/polyfill",
-  "publishConfig": {
-    "access": "public"
-  },
-  "version": "1.0.1"
-}
diff --git a/examples/adxl345/node_modules/@chirimen-raspi/polyfill/polyfill.js b/examples/adxl345/node_modules/@chirimen-raspi/polyfill/polyfill.js
deleted file mode 100755
index 313156b..0000000
--- a/examples/adxl345/node_modules/@chirimen-raspi/polyfill/polyfill.js
+++ /dev/null
@@ -1,571 +0,0 @@
-(function(){
-
-var serverURL = "wss://localhost:33330/";
-
-
-function infoLog(str){
-// console.log("info: "+str);
-}
-
-function errLog(str){
-  console.log("error: "+str);
-}
-
-
-var bone = (()=> {
-  function router(){}
-  router.prototype = {
-    wss : null,
-    send: null,
-    queue: null,        // function queue
-    onevents: null,     // onevent queue
-    waitQueue: null,
-    status: 0,  // 0: init 1: wait connection 2: connected
-    session: 0,
-    init: function (serverURL) {
-      infoLog("bone.init()");
-      this.waitQueue = new Array();
-      this.queue = new Map();
-      this.onevents = new Map();
-      this.wss = new WebSocket(serverURL);
-      this.wss.binaryType = 'arraybuffer';
-      this.status = 1;
-      this.wss.onopen = ()=> {
-        infoLog("onopen");
-        for(var cnt=0;cnt < this.waitQueue.length;cnt++){
-          if(typeof this.waitQueue[cnt] === 'function'){
-            this.waitQueue[cnt](true);
-          }
-        }
-        this.status = 2;
-        this.waitQueue = [];
-      };
-      this.wss.onerror = error => {
-        errLog("ws error: "+error);
-        var length = this.waitQueue ? this.waitQueue.length : 0;
-        for(var cnt=0;cnt < length;cnt++){
-          if(typeof this.waitQueue[cnt] === 'function'){
-            this.waitQueue[cnt](false);
-          }
-        }
-        this.status = 0;
-        this.waitQueue = [];
-      };
-      this.wss.onmessage = (mes)=> {
-        var buffer = new Uint8Array(mes.data);
-        infoLog("on message:"+buffer);
-        if(buffer[0] == 1){
-          this.receive(buffer);
-        }else if(buffer[0] == 2){
-          this.onEvent(buffer);
-        }
-      };
-    },
-    send: function(func,data){
-      return new Promise((resolve, reject)=>{
-        if(!(data instanceof Uint8Array)){
-          reject("type error: Please using with Uint8Array buffer.");
-          return;
-        }
-        var length = data.length + 4;
-        var buf = new Uint8Array(length);
-
-        buf[0] = 1; // 1: API Request
-        buf[1] = (this.session) & 0x00ff;  // session LSB
-        buf[2] = (this.session >> 8);      // session MSB
-        buf[3] = func;
-
-        for(var cnt=0;cnt<data.length;cnt++){
-          buf[4+cnt] = data[cnt];
-        }
-        infoLog("send message:"+buf);
-        this.queue.set(this.session,(data)=>{
-          resolve(data);
-        });
-        this.wss.send(buf);
-        buf=null;
-        this.session ++;
-        if(this.session > 0xffff){
-          this.session = 0;
-        }
-      });
-    },
-
-    receive: function(mes){
-      if(!(mes instanceof Uint8Array)){
-        errLog("type error: Please using with Uint8Array buffer.");
-        return;
-      }
-      var session = ((mes[1] & 0x00ff) | (mes[2] << 8));
-      var func = this.queue.get(session);
-      if(typeof func === 'function'){
-        infoLog("result");
-        var data = new Array();
-        for(var cnt=0;cnt < (mes.length-4);cnt++){
-          data.push(mes[4+cnt]);
-        }
-        func(data);
-        this.queue.delete(session);
-      }else{
-        errLog("func type error: session="+session+" func="+func);
-      }
-    },
-
-    registerEvent: function(f,port,func){
-      var key = (f << 8) | port;
-      this.onevents.set(key,func);
-    },
-
-    removeEvent: function(f,port){
-      var key = (f << 8) | port;
-      this.onevents.delete(key);
-    },
-
-    onEvent: function(data){
-      if(!(data instanceof Uint8Array)){
-        errLog("type error: Please using with Uint8Array buffer.");
-        return;
-      }
-
-    // [0] Change Callback (2)
-    // [1] session id LSB (0)
-    // [2] session id MSB (0)
-    // [3] function id (0x14)
-    // [4] Port Number
-    // [5] Value (0:LOW 1:HIGH)
-      var key = data[3];
-      key = (key << 8)| data[4];
-
-      var func = this.onevents.get(key);
-      if(typeof func === 'function'){
-        infoLog("onevent");
-        func(data);
-      }
-    },
-
-    waitConnection: function(func){
-      return new Promise((resolve, reject)=>{
-        if(this.status == 2){
-          resolve();
-        }else if(this.status == 0){
-          reject();
-        }else{
-          this.waitQueue.push((result)=>{
-            if(result == true){
-              resolve();
-            }else{
-              reject();
-            }
-          });
-        }
-      });
-    }
-  };
-
-  var rt = new router();
-  rt.init(serverURL);
-  return rt;
-})();
-
-
-//////////////////////////////////////////////////////////////////////////
-// GPIOAccess
-// Raspberry Pi GPIO Port Number
-
-// todo: add portName and pinName
-var gpioPorts = [4,17,18,27,22,23,24,25,5,6,12,13,19,16,26,20,21];
-
-var GPIOAccess = function () {
-  this.init();
-};
-
-GPIOAccess.prototype = {
-  init: function(){
-    this.ports = new Map();
-    for(var cnt = 0;cnt < gpioPorts.length;cnt++){
-      this.ports.set(gpioPorts[cnt],new GPIOPort(gpioPorts[cnt]));
-    }
-  },
-  ports: new Map(),
-  unexportAll: null,
-  onchange: null,
-};
-
-var GPIOPort = function (portNumber) {
-  infoLog("GPIOPort:"+portNumber);
-  this.init(portNumber);
-};
-
-GPIOPort.prototype = {
-  init: function (portNumber) {
-    this.portNumber = portNumber;
-    this.portName = '';
-    this.pinName = '';
-    this.direction = '';
-    this.exported = false;
-    this.value = null;
-    this.onchange = null;
-  },
-
-  export : function(direction){
-    return new Promise((resolve,reject)=>{
-      var dir = -1;
-      if(direction === 'out'){
-        dir = 0;
-        bone.removeEvent(0x14,this.portNumber);
-      }else if(direction === 'in'){
-        dir = 1;
-//        console.dir(bone);
-        bone.registerEvent(0x14,this.portNumber,(buf)=>{
-          if(typeof this.onchange === 'function'){
-            infoLog("onchange");
-            this.onchange(buf[5]);
-          }
-        });
-      }else{
-        reject("export:direction not valid! ["+direction+"]");
-      }
-      infoLog("export: Port:"+this.portNumber+" direction="+direction);
-      var data = new Uint8Array([this.portNumber,dir]);
-      bone.send(0x10,data).then((result)=>{
-        if(result[0]==0){
-          reject("GPIOPort("+this.portNumber+").export() error");
-        }else{
-          resolve();
-        }
-      },(error)=>{
-        reject(error);
-      });
-    });
-  },
-  read : function(){
-    return new Promise((resolve,reject)=>{
-      infoLog("read: Port:"+this.portNumber);
-      var data = new Uint8Array([this.portNumber]);
-      bone.send(0x12,data).then((result)=>{
-        if(result[0]==0){
-          reject("GPIOPort("+this.portNumber+").read() error");
-        }else{
-          resolve(result[1]);
-        }
-      },(error)=>{
-        reject(error);
-      });
-    });
-  },
-  write : function(value){
-    return new Promise((resolve,reject)=>{
-      infoLog("write: Port:"+this.portNumber+" value="+value);
-      var data = new Uint8Array([this.portNumber,value]);
-      bone.send(0x11,data).then((result)=>{
-        if(result[0]==0){
-          reject("GPIOPort("+this.portNumber+").write() error");
-        }else{
-          resolve();
-        }
-      },(error)=>{
-        reject(error);
-      });
-    });
-  },
-  onchange : null,
-  unexport : function(){
-    return new Promise((resolve,reject)=>{
-      infoLog("unexport: Port:"+this.portNumber);
-      var data = new Uint8Array([this.portNumber,value]);
-      bone.send(0x13,data).then((result)=>{
-        if(result[0]==0){
-          reject("GPIOPort("+this.portNumber+").unexport() error");
-        }else{
-          resolve();
-        }
-      },(error)=>{
-        reject(error);
-      });
-    });
-  }
-};
-
-//////////////////////////////////////////////////////////////////////////
-// I2CAccess
-
-var i2cPorts = [1];
-
-var I2CAccess = function () {
-  this.init();
-};
-
-I2CAccess.prototype = {
-  init: function(){
-    this.ports = new Map();
-    for(var cnt = 0;cnt < i2cPorts.length;cnt++){
-      this.ports.set(i2cPorts[cnt],new I2CPort(i2cPorts[cnt]));
-    }
-  },
-  ports: new Map()
-};
-
-function I2CPort(portNumber) {
-  this.init(portNumber);
-}
-
-I2CPort.prototype = {
-  init: function (portNumber) {
-    this.portNumber = portNumber;
-  },
-
-  portNumber: 0,
-  open: function (slaveAddress){
-    return new Promise((resolve,reject)=>{
-      new I2CSlaveDevice(this.portNumber, slaveAddress).then((i2cslave)=>{
-        resolve(i2cslave);
-      },(err)=>{
-        reject(err);
-      });
-    });
-  },
-};
-
-function I2CSlaveDevice(portNumber,slaveAddress){
-  return new Promise((resolve,reject)=>{
-    this.init(portNumber, slaveAddress).then(()=>{
-      resolve(this);
-    },(err)=>{
-      reject(err);
-    });
-  });
-}
-
-I2CSlaveDevice.prototype = {
-  portNumber:null,
-  slaveAddress:null,
-  slaveDevice:null,
-
-  init: function (portNumber,slaveAddress) {
-    return new Promise((resolve,reject)=>{
-      this.portNumber = portNumber;
-      this.slaveAddress = slaveAddress;
-      var data = new Uint8Array([this.slaveAddress,1]);
-      bone.send(0x20,data).then((result)=>{
-        if(result[0] != 0){
-          infoLog("I2CSlaveDevice.init() result OK");
-          resolve(this);
-        }else{
-          errLog("I2CSlaveDevice.init() result NG");
-          reject("I2CSlaveDevice.init() result NG:");
-        }
-      },(error)=>{
-        reject(error);
-      });
-    });
-  },
-
-  read8: function (registerNumber) {
-    return new Promise((resolve, reject)=>{
-      var data = new Uint8Array([this.slaveAddress,registerNumber,1]);
-      bone.send(0x23,data).then((result)=>{
-        infoLog("I2CSlaveDevice.read8() result value="+result);
-        var readSize = result[0];
-        if(readSize == 1){
-          resolve(result[1]);
-        }else{
-          reject("read8() readSize unmatch : "+readSize);
-        }
-      },(error)=>{
-        reject(error);
-      });
-    });
-  },
-
-  read16: function (registerNumber) {
-    return new Promise((resolve, reject)=>{
-      infoLog("I2CSlaveDevice.read16() registerNumber="+registerNumber);
-      var data = new Uint8Array([this.slaveAddress,registerNumber,2]);
-      bone.send(0x23,data).then((result)=>{
-        infoLog("I2CSlaveDevice.write8() result value="+result);
-        var readSize = result[0];
-        if(readSize == 2){
-          var res_l = result[1];
-          var res_h = result[2];
-          var res = res_l + (res_h << 8);
-          resolve(res);
-        }else{
-          reject("read16() readSize unmatch : "+readSize);
-        }
-      },(error)=>{
-        reject(error);
-      });
-    });
-  },
-
-  write8: function (registerNumber, value) {
-    return new Promise((resolve, reject)=>{
-      infoLog("I2CSlaveDevice.write8() registerNumber="+registerNumber," value="+value);
-      var size = 2;
-      var data = new Uint8Array([this.slaveAddress,size,registerNumber,value]);
-      bone.send(0x21,data).then((result)=>{
-        infoLog("I2CSlaveDevice.write8() result value="+result);
-        if(result[0] != size){
-          reject("I2CSlaveAddress("+this.slaveAddress+").write8():error")
-        }else{
-          resolve();
-        }
-      },(error)=>{
-        reject(error);
-      });
-    });
-  },
-
-  write16: function (registerNumber, value) {
-    return new Promise((resolve, reject)=>{
-      infoLog("I2CSlaveDevice.write16() registerNumber="+registerNumber," value="+value);
-      var value_L = value & 0x00ff;
-      var value_H = (value >> 8) & 0x00ff;
-      var size = 3;
-      var data = new Uint8Array([this.slaveAddress,size,registerNumber,value_L,value_H]);
-      bone.send(0x21,data).then((result)=>{
-        infoLog("I2CSlaveDevice.write16() result value="+result);
-        if(result[0] != size){
-          reject("I2CSlaveAddress("+this.slaveAddress+").write16():error")
-        }else{
-          resolve();
-        }
-      },(error)=>{
-        reject(error);
-      });
-    });
-  },
-
-  readByte: function () {
-    return new Promise((resolve, reject)=>{
-      var data = new Uint8Array([this.slaveAddress,1]);
-      bone.send(0x22,data).then((result)=>{
-        infoLog("I2CSlaveDevice.readByte() result value="+result);
-        var readSize = result[0];
-        if(readSize == 1){
-          resolve(result[1]);
-        }else{
-          reject("readByte() readSize unmatch : "+readSize);
-        }
-      },(error)=>{
-        reject(error);
-      });
-    });
-  },
-
-  readBytes: function (length) {
-    return new Promise((resolve, reject)=>{
-      if((typeof length !== 'number')||(length > 127)){
-        reject("readBytes() readSize error : "+length);
-      }
-      var data = new Uint8Array([this.slaveAddress,length]);
-      bone.send(0x22,data).then((result)=>{
-        infoLog("I2CSlaveDevice.readBytes() result value="+result);
-        var readSize = result[0];
-        if(readSize == length){
-          var buffer = result;
-          buffer.shift();  // readSizeを削除
-          resolve(buffer);
-        }else{
-          reject("readBytes() readSize unmatch : "+readSize);
-        }
-      },(error)=>{
-        reject(error);
-      });
-    });
-  },
-
-  writeByte: function (value) {
-    return new Promise((resolve, reject)=>{
-      infoLog("I2CSlaveDevice.writeByte() value="+value);
-      var size = 1;
-      var data = new Uint8Array([this.slaveAddress,size,value]);
-      bone.send(0x21,data).then((result)=>{
-        infoLog("I2CSlaveDevice.writeByte() result"+result);
-        if(result[0] != size){
-          reject("I2CSlaveAddress("+this.slaveAddress+").writeByte():error")
-        }else{
-          resolve();
-        }
-      },(error)=>{
-        reject(error);
-      });
-    });
-  },
-
-  writeBytes: function (buffer) {
-    return new Promise((resolve, reject)=>{
-      if(buffer.length == null){
-        reject("readBytes() parameter error : "+buffer);
-      }
-      var arr = [this.slaveAddress,buffer.length];
-      for(var cnt=0;cnt < buffer.length;cnt ++){
-        arr.push(buffer[cnt]);
-      }
-      var data = new Uint8Array(arr);
-      bone.send(0x21,data).then((result)=>{
-        infoLog("I2CSlaveDevice.writeBytes() result value="+result);
-        if(result[0] == buffer.length){
-          var resbuffer = result;
-          resbuffer.shift();  // readSizeを削除
-          resolve(resbuffer);
-        }else{
-          reject("writeBytes() writeSize unmatch : "+result[0]);
-        }
-      },(error)=>{
-        reject(error);
-      });
-    });
-  }
-
-};
-
-
-//////////////////////////////////////////////////////////////////////////
-// navigator
-
-if (!navigator.requestI2CAccess) {
-  navigator.requestI2CAccess = function () {
-    return new Promise(function(resolve,reject){
-//      console.dir(bone);
-      bone.waitConnection().then(()=>{
-        var i2cAccess = new I2CAccess();
-        infoLog("I2CAccess.resolve");
-        resolve(i2cAccess);
-      }).catch(e=>{
-        reject(e);
-      });
-    });
-  };
-}
-
-if (!navigator.requestGPIOAccess) {
-  navigator.requestGPIOAccess = function () {
-    return new Promise(function(resolve,reject){
-//      console.dir(bone);
-      bone.waitConnection().then(()=>{
-        var gpioAccess = new GPIOAccess();
-        infoLog("gpioAccess.resolve");
-        resolve(gpioAccess);
-      }).catch(e=>{
-        reject(e);
-      });
-    });
-  };
-}
-
-})()
-
-//////////////////////////////////////////////////////////////////////////
-// common utility functions
-
-/**
- * Utility function for async/await code.
- * @param {number} ms - milliseconds to wait
- * @return {Promise} A promise to be resolved after ms milliseconds later.
- */
-function sleep(ms) {
-  return new Promise(function(resolve) {
-    setTimeout(resolve, ms);
-  });
-}
diff --git a/examples/adxl345/package.json b/examples/adxl345/package.json
index 8784c13..34ed236 100644
--- a/examples/adxl345/package.json
+++ b/examples/adxl345/package.json
@@ -1,9 +1,5 @@
 {
   "name": "i2c-grove-accelerometer-example",
   "version": "1.0.0",
-  "private": true,
-  "dependencies": {
-    "@chirimen-raspi/chirimen-driver-i2c-grove-accelerometer": "^1.0.0",
-    "@chirimen-raspi/polyfill": "^1.0.1"
-  }
+  "private": true
 }
diff --git a/node-examples/adxl345/main.js b/node-examples/adxl345/main.js
new file mode 100755
index 0000000..7d3fa67
--- /dev/null
+++ b/node-examples/adxl345/main.js
@@ -0,0 +1,23 @@
+const { requestI2CAccess } = require("node-web-i2c");
+const GROVEACCELEROMETER = require("@chirimen/grove-accelerometer");
+const { promisify } = require("util");
+const sleep = promisify(setTimeout)
+
+
+main();
+
+async function main() {
+  const i2cAccess = await requestI2CAccess();
+  const port = i2cAccess.ports.get(1);
+  const groveaccelerometer = new GROVEACCELEROMETER(port, 0x53);
+  await groveaccelerometer.init();
+  for (;;) {
+    try {
+      const values = await groveaccelerometer.read();
+      console.log(`ax: ${values.x}, ax: ${values.y}, ax: ${values.z}`)
+    } catch (err) {
+      console.error("READ ERROR:" + err);
+    }
+    await sleep(1000);
+  }
+}
diff --git a/node-examples/adxl345/package.json b/node-examples/adxl345/package.json
new file mode 100644
index 0000000..ee0c015
--- /dev/null
+++ b/node-examples/adxl345/package.json
@@ -0,0 +1,9 @@
+{
+  "name": "i2c-grove-accelerometer-example",
+  "version": "1.0.0",
+  "private": true,
+  "dependencies": {
+    "@chirimen/grove-accelerometer": "^1.0.0-alpha.1",
+    "node-web-i2c": "^1.1.1"
+  }
+}
diff --git a/node-examples/adxl345/readme.md b/node-examples/adxl345/readme.md
new file mode 100644
index 0000000..0120934
--- /dev/null
+++ b/node-examples/adxl345/readme.md
@@ -0,0 +1,3 @@
+# 回路図
+
+![回路図](./schematic.png "schematic")
\ No newline at end of file
diff --git a/node-examples/adxl345/sandbox.config.json b/node-examples/adxl345/sandbox.config.json
new file mode 100644
index 0000000..5866ed7
--- /dev/null
+++ b/node-examples/adxl345/sandbox.config.json
@@ -0,0 +1,3 @@
+{
+  "template": "static"
+}
diff --git a/node-examples/adxl345/schematic.png b/node-examples/adxl345/schematic.png
new file mode 100644
index 0000000..916baa4
Binary files /dev/null and b/node-examples/adxl345/schematic.png differ