BrainPad - Christmas light demo (Using APA102 LED belt, from BrainPad Beginners guide)

BrainPad_ChristmasLight.js

let center = 12
let startRed = 0
let startGreen = 0
let startBlue = 0
let red = 0
let green = 0
let blue = 0
let data: Buffer = pins.createBuffer(4)
let dummy: Buffer = pins.createBuffer(4)

pins.spiFrequency(1000000)

function SendStart() {
    data[0] = 0
    data[1] = 0
    data[2] = 0
    data[3] = 0

    pins.spiTransfer(data, dummy)
}

function SendRGB(red: number, green: number, blue: number) {
    data[0] = 255
    data[1] = blue
    data[2] = green
    data[3] = red

    pins.spiTransfer(data, dummy)
}

forever(function () {
    startRed = Math.constrain(startRed + Math.randomRange(-20, 20), 0, 255)
    startGreen = Math.constrain(startGreen + Math.randomRange(-20, 20), 0, 255)
    startBlue = Math.constrain(startBlue + Math.randomRange(-20, 20), 0, 255)

    SendStart()

    for (let index = 0; index <= 24; index = index + 1) {
        red = Math.constrain(startRed - Math.abs(index - center) * 16, 0, 255)
        green = Math.constrain(startGreen - Math.abs(index - center) * 16, 0, 255)
        blue = Math.constrain(startBlue - Math.abs(index - center) * 16, 0, 255)

        SendRGB(red, green, blue)
    }
})