Utilisations : entrées, sorties, …

Elevate your permissions to root user to allow IO access

sudo -i

Setup to control pin as output

Substitute 23 in the following commands for your GPIO number (GPIO, not pin number)

echo “23” > /sys/class/gpio/export echo “out” > /sys/class/gpio/gpio23/direction

Control Output State

echo “1” > /sys/class/gpio/gpio23/value echo “0” > /sys/class/gpio/gpio23/value

Setup to read pin as an input

Substitute 23 in the following commands for your GPIO number (GPIO, not pin number)

echo “23” > /sys/class/gpio/export echo “in” > /sys/class/gpio/gpio23/direction

Read its state

cat /sys/class/gpio/gpio23/value

To Release A Pin Afterwards

echo “23” > /sys/class/gpio/unexport

Avec la biblio RPI.gpio et la biblio gpiozero : Here’s a list of devices which currently supported:

• LED (also PWM LED allowing change of brightness)
• RGB LED
• Buzzer
• Motor
• Button
• Motion Sensor
• Light Sensor
• Analogue-to-Digital converters MCP3004 and MCP3008
• Robot

Vidéo d'introduction

Ressources

• La documentation de gpiozero
• gpiozero - tutorial
• Article RPI - PWM

from gpiozero import Button
mybutton = Button(2)
mybutton.wait_for_press()
print('You pushed me')

Lancer une fonction

from gpiozero import Button
from signal import pause
 
def say_hello():
	print("Hello!")
 
button = Button(2)
button.when_pressed = say_hello
 
pause()

Lancer un programme

from gpiozero import Button
from signal import pause
import subprocess
 
button = Button(2)
button.wait_for_press()
subprocess.call(['omxplayer test.mkv'], shell=True)

Déclencher deux sons avec deux boutons Avec Pygame : http://nerdparadise.com/tech/python/pygame/basics/part3/

from gpiozero import Button
from signal import pause
import pygame
 
b1 = Button(2)
b2 = Button(3)
 
pygame.mixer.init()
son1 =pygame.mixer.Sound('/usr/share/scratch/Media/Sounds/Electronic/Zoop.wav')
son2 =pygame.mixer.Sound('/usr/share/scratch/Media/Sounds/Electronic/Laser1.wav')
 
def launch_sound1():
    son1.play()
 
def launch_sound2():
    son2.play()
 
b1.when_pressed = launch_sound1
b2.when_pressed = launch_sound2
 
pause()

Même chose en plus souple

from gpiozero import LED, Button
from signal import pause
import pygame
 
 
button1 = Button(2)
button2 = Button(3)
led = LED(17)
pygame.mixer.init()
monson1 =pygame.mixer.Sound('/usr/share/scratch/Media/Sounds/Electronic/Zoop.wav')
monson2 =pygame.mixer.Sound('/usr/share/scratch/Media/Sounds/Electronic/Laser1.wav')
 
# dictionnaire clé/valeur pour lister les sons
sounds = {button1: monson1,
          button2: monson2}
 
def stateON(button):
    sounds[button].play()
    led.on()
 
def stateOFF(button):
    sounds[button].stop()
    led.off()  
 
def btntest():
    # parcours l'ensemble des clés du dictionnaire sounds
    for button in sounds.keys():
        # when_pressed envoie apr defaut le bouton en tant qu'argument de la fonction stateON / stateOFF
        button.when_pressed = stateON
        button.when_released = stateOFF
 
btntest()
pause()