import time
import RPi.GPIO as GPIO

# Pin definitions
led_pin_r = 4
led_pin_g = 5
led_pin_b = 6

# Use "GPIO" pin numbering
GPIO.setmode(GPIO.BCM)

# Set LED pin as output
GPIO.setup(led_pin_r, GPIO.OUT)
GPIO.setup(led_pin_g, GPIO.OUT)
GPIO.setup(led_pin_b, GPIO.OUT)

# Blink forever
try:
    while True:
        GPIO.output(led_pin_r, GPIO.HIGH) # Turn LED on
        time.sleep(1)                   # Delay for 1 second
        GPIO.output(led_pin_r, GPIO.LOW)  # Turn LED off
        time.sleep(1)                   # Delay for 1 second

# When you press ctrl+c, nicely release GPIO resources
finally:
    GPIO.cleanup()