81 lines
1.9 KiB
JavaScript
81 lines
1.9 KiB
JavaScript
const Gpio = require("pigpio").Gpio;
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const schedule = require("./schedule.json");
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const HZ = 40000;
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let ledRed = new Gpio(12, {mode: Gpio.OUTPUT});
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let ledGreen = new Gpio(13, {mode: Gpio.OUTPUT});
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let timings = schedule.times.reduce((result, time) => {
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result.push({start: time.time, color: time.color});
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return result;
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}, []).sort((a, b) => a.start - b.start).map((timing, i, arr) => {
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timing.end = arr[(i+1) % arr.length].start;
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return timing;
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});
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splitAtMidnight(timings);
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let state = {
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color: "red"
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}
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updateState();
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let updateStateInterval = setInterval(updateState, 1000);
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let renderInterval = setInterval(render, 50);
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function updateState() {
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let time = getTime();
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let timing = timings.find(x => x.start <= time && x.end > time);
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if(timing.color !== state.color) {
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state = {
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color: timing.color
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};
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}
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}
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function render() {
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switch(state.color) {
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case "red":
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if(ledGreen.digitalRead()) {
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return ledGreen.digitalWrite(0);
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}
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return ledRed.hardwarePwmWrite(HZ, getBrightness(Date.now()));
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break;
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case "green":
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if(ledRed.digitalRead()) {
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return ledRed.digitalWrite(0);
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}
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if(!ledGreen.digitalRead()) {
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return ledGreen.digitalWrite(1);
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}
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//Commenting out. Probably don't need breathing on green leds
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//return ledGreen.hardwarePwmWrite(HZ, getBrightness(Date.now()));
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break;
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}
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}
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function getBrightness(x) {
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return Math.floor(breathingCurve(x, 8000, 250000, 700000));
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}
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function breathingCurve(x, interval = 3000, min, max) {
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let t = x * Math.PI/(interval/2);
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let y = Math.sin(t + Math.sin(t) * 0.2);
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let untranslatedY = Math.sin(t + Math.sin(t) * 0.25);
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y = (untranslatedY + 1)/2;
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return y * (max - min) + min;
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}
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function splitAtMidnight(arr) {
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let last = arr[arr.length -1];
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arr.unshift({ ...last, start: 0});
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arr[arr.length - 1].end = 2400;
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}
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function getTime() {
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let date = new Date(Date.now());
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return (date.getHours() * 100) + date.getMinutes() + 1
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}
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