func loop(die <-chan int, t time.Duration, pin gpio.Pin) {
tick := time.Tick(t)
state := false
fmt.Println("")
for {
select {
case <-tick:
if state {
fmt.Print("\rclear ")
pin.Clear()
} else {
fmt.Print("\rset ")
pin.Set()
}
state = !state
case <-die:
fmt.Println("\ndying...")
return
}
}
}
