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GPIO / LED control#

The PiBox has 3 user-controllable LEDs on the front panel that can be controlled via the Pi’s GPIO pins 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()