raspberry_rgb_supercar.js

let gpio = require('rpi-gpio');
let Promise = require('bluebird');

//mock
// gpio = {
//     setup: function (pin, direction, cb) {
//         console.log('setup', pin, direction);
//         cb();
//     },
//     write: function (channel, value, cb) {
//         console.log('write', channel, value);
//         cb();
//     },
//     DIR_OUT: 'out'
// };

Promise.promisifyAll(gpio);

let leds = [3, 5, 7, 8, 10, 11, 12, 13, 15, 16, 18, 19, 21, 22, 23, 24, 26, 29, 31, 32, 33, 35, 36, 37];
let blueLeds = leds.filter((led, i) => i % 3 === 0);
let greenLeds = leds.filter((led, i) => i % 3 === 1);
let redLeds = leds.filter((led, i) => i % 3 === 2);

let blueLedsRev = blueLeds.slice().reverse();
let greenLedsRev = greenLeds.slice().reverse();
let redLedsRev = redLeds.slice().reverse();


let initAll = () => Promise.map(leds, led => gpio
    .setupAsync(led, gpio.DIR_OUT)
    .then(() => gpio.writeAsync(led, 0))
);

let turnOnAndOff = led => gpio
    .writeAsync(led, 1)
    .delay(70)
    .then(() => gpio.writeAsync(led, 0));


let supercar = rev => Promise.resolve(rev)
    .then(rev => Promise.mapSeries(rev ? blueLeds : blueLedsRev, turnOnAndOff).then(() => Promise.resolve(!rev)))
    .then(rev => Promise.mapSeries(rev ? greenLeds : greenLedsRev, turnOnAndOff).then(() => Promise.resolve(!rev)))
    .then(rev => Promise.mapSeries(rev ? redLeds : redLedsRev, turnOnAndOff).then(() => Promise.resolve(!rev)))


let loopSupercar = rev => Promise.resolve(rev || false)
    .then(rev => supercar(rev).then(() => Promise.resolve(!rev)))
    .then(rev => loopSupercar(rev).then(() => Promise.resolve(!rev)));

Promise.resolve()
    .then(() => initAll())
    .then(() => loopSupercar())
    .then(() => console.log('done'));