<
import time
import RPi.GPIO as GPIO
GPIO
.setmode(GPIO.BOARD)
GPIO
.setup(12, GPIO.OUT)

p
= GPIO.PWM(12, 50)  # channel=12 frequency=50Hz
p
.start(0)
try:
   
while 1:
       
for dc in range(0, 101, 5):
            p
.ChangeDutyCycle(dc)
            time
.sleep(0.1)
       
for dc in range(100, -1, -5):
            p
.ChangeDutyCycle(dc)
            time
.sleep(0.1)
except KeyboardInterrupt:
   
pass
p
.stop()
GPIO
.cleanup()


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