Micro:bit "Lighting Desk"

//Micro:bit "Lighting Desk"
//Adam Robbins 2017

//RGB LED Connected to pins 1, 2 and 8
//Variable resistor to pin 0

let blue = 0
let green = 0
let value = 0
let red = 0
let select = 0

basic.forever(() => {
    update()
    value = pins.analogReadPin(AnalogPin.P0)
    switch (select) {
        case 0:
            red = value
            basic.showString("R")
            break;
        case 1:
            green = value
            basic.showString("G")
            break;
        case 2:
            blue = value
            basic.showString("B")
            break;
        case 99:
            basic.showString(" ")
            break;
        default:
            basic.showString("ERROR 1") //all errors are undocumented
            break;
    }
})
input.onButtonPressed(Button.A, () => {
    select += 1
    if (select >= 3) { //could be == if it was not for the special 99 case
        select = 0
    }
})
input.onButtonPressed(Button.B, () => {
    red = Math.random(1023)
    green = Math.random(1023)
    blue = Math.random(1023)
    select = 99
})
function update() {
    pins.analogWritePin(AnalogPin.P1, red)
    pins.analogWritePin(AnalogPin.P8, green)
    pins.analogWritePin(AnalogPin.P2, blue)
}
input.onButtonPressed(Button.AB, () => {
    basic.showString(".R")
    basic.showNumber(red)
    basic.showString(".G")
    basic.showNumber(green)
    basic.showString(".B")
    basic.showNumber(blue)
    basic.clearScreen()
})