Goroutine on Wio Terminal (2)

https://gist.github.com/tzechienchu/3685e7a2b6680b86f11eaaa4bc03e98c

func pinDebounce(
	done <-chan interface{},
	pin machine.Pin,
	delay time.Duration,
) <-chan bool {
	pStream := make(chan bool)
	btnV := [2]bool{false, false}
	go func() {
		defer close(pStream)
		for {
			v1 := !pin.Get()
			btnV[0] = v1
			select {
			case <-done:
				return
			case pStream <- btnV[0] && btnV[1]:
			}
			time.Sleep(time.Duration(delay) * time.Millisecond)
			btnV[1] = btnV[0]
		}
	}()
	return pStream
}
func readLightSensor(
	done <-chan interface{},
	delay time.Duration,
) <-chan uint16 {
	sensor := machine.ADC{Pin: machine.WIO_LIGHT}
	sensor.Configure(machine.ADCConfig{})
	pStream := make(chan uint16)
	go func() {
		defer close(pStream)
		for {
			val := sensor.Get()
			select {
			case <-done:
				return
			case pStream <- val:
			}
			time.Sleep(time.Duration(delay) * time.Millisecond)
		}
	}()
	return pStream
}
func lowPass(
	done <-chan interface{},
	vStream <-chan uint16,
) <-chan uint16 {
	iStream := make(chan uint16)
	his := uint16(0)
	fir := func(val uint16) uint16 {
		his = (his * 9 / 10) + (val * 1 / 10)
		return his
	}
	go func() {
		defer close(iStream)
		for v := range vStream {
			select {
			case <-done:
				return
			case iStream <- fir(v):
			}
		}
	}()
	return iStream
}

Use Goroutine is so easy to compose different IO.
Latter will add a state machine use goroutine.