#!/usr/bin/env python
import RPi.GPIO as GPIO
import time

BZRPin = 11

GPIO.setmode(GPIO.BOARD) # Numbers pins by physical location
GPIO.setup(BZRPin, GPIO.OUT) # Set pin mode as output
GPIO.output(BZRPin, GPIO.LOW)
p = GPIO.PWM(BZRPin, 50) # init frequency: 50HZ
p.start(50) # Duty cycle: 50%
try:
	while True:
		for f in range(220, 880, 10):
			p.ChangeFrequency(f)
			time.sleep(0.01)

                for f in range(0, 4):
			p.ChangeFrequency(923.32)
			time.sleep(0.2)
			p.ChangeFrequency(880)
			time.sleep(0.2)

except KeyboardInterrupt:
	p.stop()
	GPIO.cleanup()
