import RPi.GPIO as GPIO
from time import sleep
GPIO.setmode(GPIO.BOARD)
GPIO.setup(11, GPIO.OUT, initial = 0)
GPIO.setup(13, GPIO.OUT, initial = 0)
GPIO.setup(15, GPIO.OUT, initial = 0)
while True:
GPIO.output(15, 0)
GPIO.output(13, 0)
GPIO.output(11, 1)
sleep(1)
GPIO.output(15, 0)
GPIO.output(11, 0)
GPIO.output(13, 1)
sleep(1)
GPIO.output(11, 0)
GPIO.output(13, 0)
GPIO.output(15, 1)
sleep(1)