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import gpio

import time

servo_pin = "gpio2"

def delayMicroseconds(us):

time.sleep(1.0*us/1000/1000)

def delay(ms):

time.sleep(1.0*ms/1000)

def setup():

gpio.pinMode(servo_pin, gpio.OUTPUT)

def loop():

duty = 0

while True:

for i in range(5):

duty +=500

for j in range(20):

gpio.digitalWrite(servo_pin, gpio.HIGH)

delayMicroseconds(duty)

gpio.digitalWrite(servo_pin, gpio.LOW)

delayMicroseconds(20000-duty)

delay(500)

time.sleep(1.5)

for i in range(5):

duty -=500

for j in range(20):

gpio.digitalWrite(servo_pin, gpio.HIGH)

delayMicroseconds(duty)

gpio.digitalWrite(servo_pin, gpio.LOW)

delayMicroseconds(20000-duty)

delay(500)

time.sleep(1.5)

def main():

setup()

loop()

main()