docs:raspberrypi:controlling_led_s_with_gpio [hartungdesign.net wiki]

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====== controlling LED's with GPIO ======

===== turn on 1 LED =====
**led-on.py**<code python>
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(17,GPIO.OUT)

GPIO.output(17,GPIO.HIGH)
</code>

===== turn off 1 LED =====
**led-off.py**<code python>
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(17,GPIO.OUT)

GPIO.output(17,GPIO.LOW)
</code>

===== 1 blinking LED =====
**led-blink.py**<code python>
import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(17,GPIO.OUT)

while True:
        GPIO.output(17,GPIO.HIGH)
        time.sleep(1)
        GPIO.output(17,GPIO.LOW)
        time.sleep(1)
</code>

===== 3 blinking LED's =====
**led-blink-3.py**<code python>
import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(17,GPIO.OUT)
GPIO.setup(27,GPIO.OUT)
GPIO.setup(22,GPIO.OUT)

while True:
        GPIO.output(17,GPIO.HIGH)
        time.sleep(.2)
        GPIO.output(17,GPIO.LOW)
        GPIO.output(27,GPIO.HIGH)
        time.sleep(.2)
        GPIO.output(27,GPIO.LOW)
        GPIO.output(22,GPIO.HIGH)
        time.sleep(.2)
        GPIO.output(22,GPIO.LOW)
</code>

===== turn off 3 LED's =====
**led-off-3.py**<code python>
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(17,GPIO.OUT)
GPIO.setup(27,GPIO.OUT)
GPIO.setup(22,GPIO.OUT)

GPIO.output(17,GPIO.LOW)
GPIO.output(27,GPIO.LOW)
GPIO.output(22,GPIO.LOW)
</code>