rgb-led-flash.go

package main

import (
	"github.com/stianeikeland/go-rpio"
	"time"
)

var green rpio.Pin
var red rpio.Pin
var blue rpio.Pin

func main() {

	err := rpio.Open()
	if err != nil {
		panic(err)
	}

	green := rpio.Pin(17)
	green.Output()

	red := rpio.Pin(18)
	red.Output()

	blue := rpio.Pin(27)
	blue.Output()

	red.Low()
	green.Low()
	blue.Low()

	display := make(chan rpio.Pin)

	go func(in chan rpio.Pin) {
		var previousPin rpio.Pin

		for newPin := range in {
			if previousPin != 0 {
				previousPin.Low()
			}

			previousPin = newPin
			newPin.High()
		}
	}(display)

	for {
		display <- blue
		time.Sleep(500 * time.Millisecond)
		display <- red
		time.Sleep(500 * time.Millisecond)
		display <- green
		time.Sleep(500 * time.Millisecond)
	}

}