blinking_led.py

#
# Source: https://thepihut.com/blogs/raspberry-pi-tutorials/27968772-turning-on-an-led-with-your-raspberry-pis-gpio-pins
#

import RPi.GPIO as GPIO              # Import Raspberry Pi GPIO library
from time import sleep               # Import the sleep function

pinLED = 27                          # LED GPIO Pin LED
GPIO.setmode(GPIO.BCM)               # Use GPIO pin number
GPIO.setwarnings(False)              # Ignore warnings in our case
GPIO.setup(pinLED, GPIO.OUT)         # GPIO pin as output pin

while True:                          # Endless Loop
    GPIO.output(pinLED, GPIO.HIGH)   # Turn on
    print("LED on")                  # Prints state to console
    sleep(1)                         # Pause 1 second
    GPIO.output(pinLED, GPIO.LOW)    # Turn off
    print("LED off")                 # Prints state to console
    sleep(1)                         # Pause 1 second