import RPi.GPIO as GPIO
import time

mota = 22
motb = 23

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(mota,GPIO.OUT)
GPIO.setup(motb,GPIO.OUT)

p1 = GPIO.PWM(mota, 100) # GPIO PWM with 50Hz
p2 = GPIO.PWM(motb, 50) # GPIO PWM with 50Hz
print "CTRL+C = STOP program"

try:
    while True:
            n = 100
            p1.start(0)
            p1.ChangeDutyCycle(n)
            time.sleep(1)
            p1.stop()
            GPIO.output(mota,GPIO.LOW)
            time.sleep(2)

            n = 30
            p2.start(0)
            p2.ChangeDutyCycle(n)
            time.sleep(1)
            p2.stop()
            GPIO.output(motb,GPIO.LOW)
            time.sleep(2)            
           
except KeyboardInterrupt:
    GPIO.cleanup()  # must be executed before program stop