#!/bin/bash

trap ctrl_c INT

delay=0.05

function ctrl_c() {
 echo "0" > /sys/class/gpio/gpio17/value
 echo "0" > /sys/class/gpio/gpio27/value
 echo "0" > /sys/class/gpio/gpio23/value
 exit 0
}

# RED
echo "17" > /sys/class/gpio/export 2>/dev/null
echo "out" > /sys/class/gpio/gpio17/direction
# GREEN
echo "27" > /sys/class/gpio/export 2>/dev/null
echo "out" > /sys/class/gpio/gpio27/direction
# BLUE
echo "23" > /sys/class/gpio/export 2>/dev/null
echo "out" > /sys/class/gpio/gpio23/direction

while :
do
    echo "1" > /sys/class/gpio/gpio17/value
    sleep $delay
    echo "0" > /sys/class/gpio/gpio17/value
    echo "1" > /sys/class/gpio/gpio27/value
    sleep $delay
    echo "0" > /sys/class/gpio/gpio27/value
    echo "1" > /sys/class/gpio/gpio23/value
    sleep $delay
    echo "0" > /sys/class/gpio/gpio23/value
done