Added Espruino wifi led strip

EspruinoWifi-LEDStrip/README.md

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+# Espruino WiFi - LED Strip
+
+## Features
+
+- Control LED strip via MQTT
+- Built in Home Assistant support
+- RGB colour support
+- Built in effects - chaser, random and disco
+
+## Setup
+
+Populate the variables at the top of index.js with your WiFi and MQTT details then flash to an Espruino WiFi.
+
+## Usage

EspruinoWifi-LEDStrip/index.js

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+const WIFI_NAME = "";
+const WIFI_KEY = "";
+const MQTT_HOST = "";
+const MQTT_PORT = "";
+const MQTT_USER = "";
+const MQTT_PASS = "";
+const DEVICE_NAME = "";
+const LED_COUNT = 44;
+
+const Clock = require("clock").Clock;
+var clk = new Clock();
+const wifi = require("Wifi");
+const http = require("http");
+var mqtt;
+var intervalId;
+
+var configTopic = `homeassistant/light/${DEVICE_NAME}_Light/config`;
+var rootTopic = `custom/light/${DEVICE_NAME}_Light`;
+var config = {
+  "~": rootTopic,
+  "cmd_t": "~/set",
+  "stat_t": "~/state",
+  "device": {
+    "manufacturer": "Espruino",
+    "model": "WiFi",
+    "identifiers": getSerial(),
+    "sw_version": "0.0.1",
+    "name": `${DEVICE_NAME}_Light`
+  },
+  "name": `${DEVICE_NAME}_Light`,
+  "schema": "json",
+  "unique_id": getSerial(),
+  "effect": true,
+  "effect_list": ["none", "chaser", "random", "disco"],
+  "rgb": true
+};
+
+var lastSeenIntervalId;
+var state = {
+  "last_seen": clk.getDate().toISOString(),
+  "color":{"r":0,"g":0,"b":0},
+  "state":"OFF"
+};
+
+function updateLight() {
+  var ledArr = new Uint8ClampedArray(LED_COUNT*3);
+  var r = state.color.r;
+  var g = state.color.g;
+  var b = state.color.b;
+
+  if (state.state === "OFF") {
+    r = g = b = 0;
+  } else if (r == 0 && g == 0 && b == 0) {
+    r = g = b = 255;
+    state.color.r = state.color.g = state.color.b = 255;
+  }
+
+  if (intervalId) clearInterval(intervalId);
+
+  switch(state.effect) {
+    case "chaser":
+      var pos = 0;
+      var getPattern = function() {
+          pos = (pos + 1) % LED_COUNT;
+          ledArr[pos * 3 + 0] = g;
+          ledArr[pos * 3 + 1] = r;
+          ledArr[pos * 3 + 2] = b;
+
+          for(var i = 0; i < LED_COUNT * 3; i++) {
+            ledArr[i] *= 0.9;
+          }
+
+          return ledArr;
+      };
+      intervalId = setInterval(function() {
+        require("neopixel").write(B15, getPattern());
+      }, 50);
+      break;
+    case "disco":
+      var getPattern = function() {
+        r = Math.floor(Math.random() * 256);
+        g = Math.floor(Math.random() * 256);
+        b = Math.floor(Math.random() * 256);
+        for(var i=0;i<ledArr.length;) {
+          ledArr[i++] = g;
+          ledArr[i++] = r;
+          ledArr[i++] = b;
+        }
+        return ledArr;
+      };
+      intervalId = setInterval(function() {
+        require("neopixel").write(B15, getPattern());
+      }, 200);
+      break;
+    case "random":
+      r = Math.floor(Math.random() * 256);
+      g = Math.floor(Math.random() * 256);
+      b = Math.floor(Math.random() * 256);
+    default:
+      for(var i=0;i<ledArr.length;) {
+        ledArr[i++] = g;
+        ledArr[i++] = r;
+        ledArr[i++] = b;
+      }
+      require("neopixel").write(B15, ledArr);
+      break;
+  }
+}
+
+function setState(newState) {
+  state = Object.assign(state, newState);
+  updateLight();
+  state.last_seen = clk.getDate().toISOString();
+  mqtt.publish(rootTopic + "/state", JSON.stringify(state));
+}
+
+function onConnect() {
+  console.log("MQTT connected");
+  // Expose capabilities to HomeAssistant
+  mqtt.publish(configTopic, JSON.stringify(config), { retain: true });
+  // watch for updates
+  mqtt.subscribe(rootTopic + "/set");
+  console.log("Subscribed");
+  setState(state);
+
+  lastSeenIntervalId = setInterval(function() {
+    state.last_seen = clk.getDate().toISOString();
+    mqtt.publish(rootTopic + "/state", JSON.stringify(state));
+  }, 60*1000);
+}
+
+function onDisconnect() {
+  console.log("MQTT disconnected");
+  clearInterval(lastSeenIntervalId);
+  mqtt.connect();
+}
+
+function onMessage(pub) {
+  console.log("MQTT => ", pub.message);
+  var msg = JSON.parse(pub.message);
+  setState(msg);
+}
+
+function onInit() {
+  console.log("Connecting to WiFi");
+  wifi.connect(WIFI_NAME, { password : WIFI_KEY }, function(err) {
+    if (err) {
+      console.log("WiFi Connection error: "+err);
+      return setTimeout(onInit, 1000);
+    }
+  });
+
+  wifi.on('connected', function() {
+    console.log("Connected to WiFi");
+
+    http.get("http://www.espruino.com", function(res) {
+      clk = new Clock(res.headers.Date);
+
+      console.log("Connecting to MQTT");
+      mqtt = require("MQTT").connect({
+        host: MQTT_HOST,
+        port: MQTT_PORT,
+        username: MQTT_USER,
+        password: MQTT_PASS
+      });
+      mqtt.on('connected', onConnect);
+      mqtt.on('publish', onMessage);
+      mqtt.on("disconnected", onDisconnect);
+    });
+  });
+
+  wifi.on('disconnected',function() {
+    console.log("WiFi disconnected");
+    return setTimeout(onInit, 1000);
+  });
+
+}

README.md

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+# Smart Devices
+
+> A collection of the code powering my homemade smart devices
+
+## Devices
+
+- [Espruino WiFi powered LED Strip](EspruinoWifi-LEDStrip)