GPIO / LED control

The PiBox has a single RGB LED on the front panel (the top unlabeled LED) that is user controllable via 3 separate GPIO using a variety of languages.

Pinout

GPIO Pin	Function
GPIO 17	Red LED
GPIO 27	Green LED
GPIO 23	Blue LED

Controlling with Bash

The following example turns the Red LED on for 1 second, then off

# First make the GPIO pin accessible in user space
echo "17" > /sys/class/gpio/export

# Set the GPIO pin as an output
echo "out" > /sys/class/gpio/gpio17/direction

# Turn the LED ON, wait 1 second, then OFF
echo "1" > /sys/class/gpio/gpio17/value
sleep 1
echo "0" > /sys/class/gpio/gpio17/value

Controlling with Python

First, install the RPi.GPIO library.

sudo pip3 install RPi.GPIO

The following example toggles the Red channel of the RGB LED once every second, ten times

import RPi.GPIO as GPIO
import time

led = 17

GPIO.setmode(GPIO.BOARD)
GPIO.setup(led, GPIO.OUT)

for i in range(10):
    GPIO.output(led, GPIO.HIGH)
    time.sleep(0.5)
    GPIO.output(led, GPIO.LOW)
    time.sleep(0.5)

GPIO.cleanup()