relay-demo.py

import RPi.GPIO as GPIO
import time

in1 = 16
in2 = 18

GPIO.setmode(GPIO.BOARD)
GPIO.setup(in1, GPIO.OUT)
GPIO.setup(in2, GPIO.OUT)

GPIO.output(in1, False)
GPIO.output(in2, False)

try:
    while True:
        for x in range(5):
            GPIO.output(in1, True)
            time.sleep(0.1)
            GPIO.output(in1, False)
            GPIO.output(in2, True)
            time.sleep(0.1)
            GPIO.output(in2, False)

        GPIO.output(in1, True)
        GPIO.output(in2, True)

        for x in range(4):
            GPIO.output(in1, True)
            time.sleep(0.05)
            GPIO.output(in1, False)
            time.sleep(0.05)
        GPIO.output(in1, True)

        for x in range(4):
            GPIO.output(in2, True)
            time.sleep(0.05)
            GPIO.output(in2, False)
            time.sleep(0.05)
        GPIO.output(in2, True)


except KeyboardInterrupt:
    GPIO.cleanup()