import time
from pololu_drv8835_rpi import motors, MAX_SPEED


try:
    motors.setSpeeds(0, 0)
    speed=0
    while(speed<=480):
        motors.motor1.setSpeed(speed)
        speed=speed+1
        time.sleep(0.01)

    while(speed>=0):
        motors.motor1.setSpeed(speed)
        speed=speed-1
        time.sleep(0.01)
   
    while(speed>=-480):
        motors.motor1.setSpeed(speed)
        speed=speed-1
        time.sleep(0.01)

    while(speed<=0): 
        motors.motor1.setSpeed(speed)
        speed=speed+1
        time.sleep(0.01)

finally:
  # Stop the motors, even if there is an exception
  # or the user presses Ctrl+C to kill the process.
  motors.setSpeeds(0, 0)