initial commit.

.gitignore

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+node_modules
+schedule.json

package-lock.json

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+{
+  "name": "sleeplight",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "bindings": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.3.1.tgz",
+      "integrity": "sha512-i47mqjF9UbjxJhxGf+pZ6kSxrnI3wBLlnGI2ArWJ4r0VrvDS7ZYXkprq/pLaBWYq4GM0r4zdHY+NNRqEMU7uew=="
+    },
+    "nan": {
+      "version": "2.11.1",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.11.1.tgz",
+      "integrity": "sha512-iji6k87OSXa0CcrLl9z+ZiYSuR2o+c0bGuNmXdrhTQTakxytAFsC56SArGYoiHlJlFoHSnvmhpceZJaXkVuOtA=="
+    },
+    "pigpio": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/pigpio/-/pigpio-1.2.0.tgz",
+      "integrity": "sha512-DGopuMdjmRguqydLZ3A16PYOiJWtl705aGF3a48Tnc6woLyts4Zj01FklJYgTqFMCZy4ZBHg49xe+W5yG5+jOw==",
+      "requires": {
+        "bindings": "^1.3.0",
+        "nan": "^2.11.1"
+      }
+    }
+  }
+}

package.json

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+{
+  "name": "sleeplight",
+  "version": "1.0.0",
+  "description": "",
+  "main": "runSchedule.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "pigpio": "^1.2.0"
+  }
+}

runSchedule.js

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+const Gpio = require("pigpio").Gpio;
+const schedule = require("./schedule.json");
+const HZ = 10000;
+
+let ledRed = new Gpio(18, {mode: Gpio.OUTPUT});
+let ledGreen = new Gpio(12, {mode: Gpio.OUTPUT});
+
+let timings = schedule.times.reduce((result, time)  => {
+	result.push({start: time.time, color: time.color});
+	return result;
+}, []).sort((a, b) => a.start - b.start).map((timing, i, arr) => {
+	timing.end = arr[(i+1) % arr.length].start;
+	return timing;
+});
+
+splitAtMidnight(timings);
+
+let state = {
+	color: "red"
+}
+
+let updateState = setInterval(() => {
+	let time = getTime();
+	let timing = timings.find(x => x.start <= time && x.end > time);
+	if(timing.color !== state.color) {
+		state = {
+			color: timing.color
+		};
+	}
+}, 1000);
+
+let render = setInterval(() => {
+	switch(state.color) {
+		case "red":
+			if(ledGreen.digitalRead()) {
+				return ledGreen.digitalWrite(0);
+			}
+			return ledRed.hardwarePwmWrite(HZ, getBrightness(Date.now()));
+			break;
+		case "green":
+			if(ledRed.digitalRead()) {
+				return ledRed.digitalWrite(0);
+			}
+			return ledGreen.hardwarePwmWrite(HZ, getBrightness(Date.now()));
+			break;
+	}
+}, 50);
+
+function getBrightness(x) {
+	return Math.floor(breathingCurve(x, 3000, 1000000, 100000));
+}
+
+function breathingCurve(x, interval = 3000, max, min) {
+	let t = (x)/interval;
+	let y = (Math.sin(t) + 1)/2;
+	return ((max-min) * y) + min;
+}
+
+function splitAtMidnight(arr) {
+	let last = arr[arr.length -1];
+	arr.unshift({ ...last, start: 0});
+	arr[arr.length - 1].end = 0;
+}
+
+function getTime() {
+	let date = new Date(Date.now());
+	return (date.getHours() * 100) + date.getMinutes() + 1
+}

schedule.json.example

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+{
+	"times": [
+		{
+			"time": 1915,
+			"color": "red"
+		},
+		{
+			"time": 700,
+			"color": "green"
+		}
+	]
+}