microbit HC-SR04 ultrasonic check

let distance = 0
basic.forever(() => {
    pins.digitalWritePin(DigitalPin.P1, 0)
    control.waitMicros(2)
    pins.digitalWritePin(DigitalPin.P1, 1)
    control.waitMicros(10)
    pins.digitalWritePin(DigitalPin.P1, 0)
    distance = pins.pulseIn(DigitalPin.P2, PulseValue.High)
    serial.writeValue("x", distance)
    serial.writeValue("y", distance / 38)
})