Enjoy electronic work with GPIO on Raspberry Pi
Raspberry Pi 3 includes a library to operate GPIO from python as standard
- Preparation: ʻimport RPi.GPIO as GPIO`
- Specify the mode:
GPIO.setmode (GPIO.BOARD)--GPIO.BOARD: Physical pin number (serial number from top left) --GPIO.BCM: Role pin number (named by broadcom) - Pin settings:
GPIO.setup (channel, GPIO.out)--GPIO.in: Input --GPIO.out: Output - Pin operation:
- GPIO.output(channel, GPIO.HIGH)
- GPIO.output(channel, GPIO.LOW)
- val = GPIO.input(channel)
Example 1: LED flickering
led-blink.py
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
GPIO.setup(11, GPIO.OUT)
while True:
GPIO.output(11, True)
time.sleep(2)
GPIO.output(11, False)
time.sleep(2)
Example 2: Detect button input
led-blink.py
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_UP)
while True:
input_state = GPIO.input(18)
if input_state == False:
print('Button Pressed')
time.sleep(0.2)
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