microbit Radio Control Robot Receiver

let adc: number[] = []
let channel_addr: number[] = []
let speed = 0
function read_adc()  {
    for (let index = 0; index <= 1; index++) {
        pins.i2cWriteNumber(
        72,
        channel_addr[index],
        NumberFormat.UInt8LE,
        false
        )
        adc[index] = pins.i2cReadNumber(72, NumberFormat.UInt16BE, false)
    }
}
function forward()  {
    pins.digitalWritePin(DigitalPin.P13, 1)
    pins.digitalWritePin(DigitalPin.P15, 0)
    pins.analogWritePin(AnalogPin.P14, speed)
    pins.analogWritePin(AnalogPin.P16, speed)
}
function backward()  {
    pins.digitalWritePin(DigitalPin.P13, 0)
    pins.digitalWritePin(DigitalPin.P15, 1)
    pins.analogWritePin(AnalogPin.P16, speed)
    pins.analogWritePin(AnalogPin.P14, speed)
}
function spin_right()  {
    pins.digitalWritePin(DigitalPin.P13, 1)
    pins.digitalWritePin(DigitalPin.P15, 1)
    pins.analogWritePin(AnalogPin.P16, speed)
    pins.analogWritePin(AnalogPin.P14, speed)
}
function spin_left()  {
    pins.digitalWritePin(DigitalPin.P13, 0)
    pins.digitalWritePin(DigitalPin.P15, 0)
    pins.analogWritePin(AnalogPin.P16, speed)
    pins.analogWritePin(AnalogPin.P14, speed)
}
function ao()  {
    pins.digitalWritePin(DigitalPin.P13, 0)
    pins.digitalWritePin(DigitalPin.P15, 0)
    pins.analogWritePin(AnalogPin.P16, 0)
    pins.analogWritePin(AnalogPin.P14, 0)
}
radio.onDataPacketReceived( ({ receivedNumber }) =>  {
    if (receivedNumber == 1) {
        forward()
    } else if (receivedNumber == 2) {
        spin_left()
        basic.pause(200)
        ao()
    } else if (receivedNumber == 3) {
        spin_right()
        basic.pause(200)
        ao()
    } else if (receivedNumber == 4) {
        backward()
    } else {
        ao()
    }
})
speed = 600
radio.setTransmitPower(7)
radio.setGroup(56)