Add AS3935

README.md

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 - [@chirimen/amg8833](https://www.jsdelivr.com/package/npm/@chirimen/amg8833)
 - [@chirimen/apds9960](https://www.jsdelivr.com/package/npm/@chirimen/apds9960)
 - [@chirimen/arduino-stepping-motor](https://www.jsdelivr.com/package/npm/@chirimen/arduino-stepping-motor)
+- [@chirimen/as3935](https://www.jsdelivr.com/package/npm/@chirimen/as3935)
 - [@chirimen/bh1750](https://www.jsdelivr.com/package/npm/@chirimen/bh1750)
 - [@chirimen/bme280](https://www.jsdelivr.com/package/npm/@chirimen/bme280)
 - [@chirimen/bme680](https://www.jsdelivr.com/package/npm/@chirimen/bme680)

packages/as3935/.gitignore

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+/index.js

packages/as3935/README.md

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+[データシート]: https://www.sciosense.com/wp-content/uploads/documents/AS3935-Data-Sheet.pdf
+
+# AS3935
+
+## センサー概要
+AS3935は、雷センサーICです。内蔵された雷アルゴリズムが入力信号をチェックし暴風雨の頭部までの距離を推定します。
+- 製品ページ: https://www.sciosense.com/products/wireless-sensor-nodes/as3935-franklin-lightning-sensor-ic/
+
+- I2C スレーブアドレス (要注意)
+  - 0x03: 秋月電子が販売するブレークアウトボードのアドレス
+  - 他に、0x00のブレークアウトボードが存在するが、使用が難しくなる
+
+詳細な仕様は[データシート][]を参照してください。
+
+## ブレークアウトボード
+- 秋月電子通商 AE-AS3935 : [製品ページ](https://akizukidenshi.com/catalog/g/gK-08685/)
+  - I2Cアドレスは0x03に設定されています。（変更不可）
+  - このアドレスのデバイスをRaspberry PI のi2cdetectで検出するためには ```-a``` オプションが必要
+  - ```i2cdetect -y -a 1```
+
+## ドライバの使用例
+
+- [こちらのリンク](https://tutorial.chirimen.org/pizero/esm-examples/#I2C_as3935) を参照ください。
+

packages/as3935/as3935.js

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+// @ts-check
+// AS3935 driver for CHIRIMEN raspberry pi3
+// AMS Franklin Lightning Sensor. I2C Sensor
+// Ported from https://github.com/pcfens/RaspberryPi-AS3935/blob/master/RPi_AS3935/RPi_AS3935.py
+// Reference 1 : https://www.ne.jp/asahi/shared/o-family/ElecRoom/AVRMCOM/AS3935/AS3935_test.html
+// Reference 2 : https://www.ishikawa-lab.com/RasPi_lightning.html
+//
+// Programmed by Satoru Takagi
+
+/** @param {number} ms Delay for a number of milliseconds. */
+const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
+
+var AS3935 = function (i2cPort, slaveAddress) {
+    if (!slaveAddress) {
+        // 秋月電子 AE-AS3935のアドレスは03です。
+        // 標準外のアドレスなので検出には-aオプション必要。i2cdetect -y -a 1
+        slaveAddress = 0x03;
+    }
+    this.i2cPort = i2cPort;
+    this.i2cSlave = null;
+    this.slaveAddress = slaveAddress;
+}
+
+AS3935.prototype = {
+    init: async function () {
+        this.i2cSlave = await this.i2cPort.open(this.slaveAddress);
+    },
+    calibrate: async function (tun_cap) {
+        /** 
+        Calibrate the lightning sensor - this takes up to half a second
+        and is blocking.
+
+        The value of tun_cap should be between 0 and 15, and is used to set
+        the internal tuning capacitors (0-120pF in steps of 8pF)
+        **/
+        await sleep(80);
+        var reg08 = await this.i2cSlave.read8(0x08);
+        if (tun_cap && tun_cap >= 0 && tun_cap < 0x10) {
+            await this.i2cSlave.write8(0x08, ((reg08 & 0xf0) | tun_cap));
+        } else {
+            console.warn("Value of TUN_CAP must be between 0 and 15");
+        }
+        await this.i2cSlave.write8(0x3D, 0x96);
+        await sleep(10);
+        reg08 = await this.i2cSlave.read8(0x08);
+        await this.i2cSlave.write8(0x08, (reg08 | 0x20));
+        await sleep(10);
+        reg08 = await this.i2cSlave.read8(0x08);
+        await this.i2cSlave.write8(0x08, (reg08 & 0xdf));
+        await sleep(10);
+    },
+    reset: async function () {
+        // Reset all registers to their default power on values
+        await this.i2cSlave.write8(0x3c, 0x96);
+    },
+    get_interrupt: async function () {
+        /**
+        Get the value of the interrupt register
+        0x01 - Too much noise
+        0x04 - Disturber
+        0x08 - Lightning
+        **/
+        var reg03 = await this.i2cSlave.read8(0x03);
+        return (reg03 & 0x0f);
+    },
+    get_distance: async function () {
+        // Get the estimated distance of the most recent lightning event
+        var reg07 = await this.i2cSlave.read8(0x07);
+        if ((reg07 & 0x3f) == 0x3f) {
+            return false;
+        } else {
+            return (reg07 & 0x3f);
+        }
+    },
+    get_energy: async function () {
+        // Get the calculated energy of the most recent lightning event
+        var reg04 = await this.i2cSlave.read8(0x04);
+        var reg05 = await this.i2cSlave.read8(0x05);
+        var reg06 = await this.i2cSlave.read8(0x06);
+        return ((reg06 & 0x1f) << 16 | reg05 << 8 | reg04);
+    },
+    get_noise_floor: async function () {
+        // Get the noise floor value.
+        // Actual voltage levels used in the sensor are located in Table 16 of the data sheet.
+        var reg01 = await this.i2cSlave.read8(0x01);
+        return ((reg01 & 0x70) >> 4);
+    },
+    set_noise_floor: async function (noisefloor) {
+        // Set the noise floor value.
+        // Actual voltage levels used in the sensor are located in Table 16 of the data sheet.
+        noisefloor = (noisefloor & 0x07) << 4;
+        var reg01 = await this.i2cSlave.read8(0x01);
+        var write_data = (reg01 & 0x8f) + noisefloor;
+        await this.i2cSlave.write8(0x01, write_data);
+    },
+    lower_noise_floor: async function (min_noise) {
+        // Lower the noise floor by one step.
+        // min_noise is the minimum step that the noise_floor should be lowered to.
+        if (!min_noise) { min_noise = 0 }
+        var floor = await this.get_noise_floor();
+        if (floor > min_noise) {
+            --floor;
+            await this.set_noise_floor(floor);
+        }
+        return floor;
+    },
+    raise_noise_floor: async function (max_noise) {
+        // Raise the noise floor by one step
+        // max_noise is the maximum step that the noise_floor should be raised to.
+        if (!max_noise) { max_noise = 7 }
+        var floor = await this.get_noise_floor();
+        if (floor < max_noise) {
+            ++floor;
+            await this.set_noise_floor(floor);
+        }
+        return floor;
+    },
+    get_min_strikes: async function () {
+        // Get the number of lightning detections required before an interrupt is raised.
+        var reg02 = await this.i2cSlave.read8(0x02);
+        var value = (reg02 >> 4) & 0x03;
+        if (value == 0) {
+            return 1;
+        } else if (value == 1) {
+            return 5;
+        } else if (value == 2) {
+            return 9;
+        } else if (value == 3) {
+            return 16;
+        }
+    },
+    set_min_strikes: async function (minstrikes) {
+        // Set the number of lightning detections required before an interrupt is raised.
+        // Valid values are 1, 5, 9, and 16, any other raises an exception.
+
+        if (minstrikes == 1) {
+            minstrikes = 0
+        } else if (minstrikes == 5) {
+            minstrikes = 1
+        } else if (minstrikes == 9) {
+            minstrikes = 2
+        } else if (minstrikes == 16) {
+            minstrikes = 3
+        } else {
+            console.error("Value must be 1, 5, 9, or 16");
+            return;
+        }
+        var reg02 = await this.i2cSlave.read8(0x02);
+        var write_data = (reg02 & 0xCF) + minstrikes;
+        await this.i2cSlave.write8(0x02, write_data);
+    },
+    get_indoors: async function () {
+        // Determine whether or not the sensor is configured for indoor use or not.
+        // Returns True if configured to be indoors, otherwise False.
+        var reg00 = await this.i2cSlave.read8(0x00);
+        if ((reg00 & 0x20) == 0x20) {
+            return true;
+        } else {
+            return false;
+        }
+    },
+    set_indoors: async function (indoors) {
+        // Set whether or not the sensor should use an indoor configuration.
+        var write_value;
+        var reg00 = await this.i2cSlave.read8(0x00);
+        if (indoors) {
+            write_value = (reg00 & 0xc1) | 0x24;
+        } else {
+            write_value = (reg00 & 0xc1) | 0x1c;
+        }
+        await this.i2cSlave.write8(0x00, write_value);
+    },
+    set_mask_disturber: async function (mask_dist) {
+        // Set whether or not disturbers should be masked (no interrupts for what the sensor determines are man-made events)
+        var reg03 = await this.i2cSlave.read8(0x03);
+        var write_value;
+        if (mask_dist) {
+            write_value = reg03 | 0x20;
+        } else {
+            write_value = reg03 | 0xdf;
+        }
+        await this.i2cSlave.write8(0x03, write_value);
+    },
+    get_mask_disturber: async function () {
+        // Get whether or not disturbers are masked or not.
+        // Returns True if interrupts are masked, false otherwise
+        var reg03 = await this.i2cSlave.read8(0x03);
+        if ((reg03 & 0x20) == 0x20) {
+            return true;
+        } else {
+            return false;
+        }
+    },
+    set_disp_lco: async function (display_lco) {
+        // Have the internal LC oscillator signal displayed on the interrupt pin for measurement.
+        // Passing display_lco=True enables the output, False disables it.
+        var reg08 = await this.i2cSlave.read8(0x08);
+        if (display_lco) {
+            await this.i2cSlave.write8(0x08, (reg08 | 0x80));
+        } else {
+            await this.i2cSlave.write8(0x08, (reg08 & 0x7f));
+        }
+        await sleep(10);
+    },
+    get_disp_lco: async function () {
+        // Determine whether or not the internal LC oscillator is displayed on the interrupt pin.
+        // Returns True if the LC oscillator is being displayed on the interrupt pin, False otherwise
+        var reg08 = await this.i2cSlave.read8(0x08);
+        if ((reg08 & 0x80) == 0x80) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+};
+
+export default AS3935;

packages/as3935/package.json

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+{
+  "name": "@chirimen/as3935",
+  "version": "1.0.0",
+  "description": "Driver for AS3935 with WebI2C",
+  "main": "index.js",
+  "module": "as3935.js",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/chirimen-oh/chirimen-drivers.git",
+    "directory": "packages/as3935"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "scripts": {
+    "build": "rollup -c",
+    "prepublishOnly": "npm run build"
+  },
+  "devDependencies": {
+    "rollup": "^4.0.0"
+  }
+}

packages/as3935/rollup.config.js

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+import { module as input, main as outputFile } from "./package.json";
+
+export default {
+  input,
+  output: {
+    file: outputFile,
+    format: "umd",
+    name: "AS3935"
+  }
+};