buzzer.py

#!/usr/bin/env python
#---------------------------------------------------
#
#	This is a program for Passive Buzzer Module
#		It will play simple songs.
#	You could try to make songs by youselves!
# 
#		Passive buzzer 			   Pi 
#			VCC ----------------- 3.3V
#			GND ------------------ GND
#			SIG ---------------- Pin 11
#
#---------------------------------------------------

import RPi.GPIO as GPIO
import time

Buzzer = 11

CL = [0, 131, 147, 165, 175, 196, 211, 248]		# Frequency of Low C notes

CM = [0, 262, 294, 330, 350, 393, 441, 495]		# Frequency of Middle C notes

CH = [0, 525, 589, 661, 700, 786, 882, 990]		# Frequency of High C notes

song_1 = [	CM[3], CM[5], CM[6], CM[3], CM[2], CM[3], CM[5], CM[6], # Notes of song1
			CH[1], CM[6], CM[5], CM[1], CM[3], CM[2], CM[2], CM[3], 
			CM[5], CM[2], CM[3], CM[3], CL[6], CL[6], CL[6], CM[1],
			CM[2], CM[3], CM[2], CL[7], CL[6], CM[1], CL[5]	]

beat_1 = [	1, 1, 3, 1, 1, 3, 1, 1, 			# Beats of song 1, 1 means 1/8 beats
			1, 1, 1, 1, 1, 1, 3, 1, 
			1, 3, 1, 1, 1, 1, 1, 1, 
			1, 2, 1, 1, 1, 1, 1, 1, 
			1, 1, 3	]

song_2 = [	CM[1], CM[1], CM[1], CL[5], CM[3], CM[3], CM[3], CM[1], # Notes of song2
			CM[1], CM[3], CM[5], CM[5], CM[4], CM[3], CM[2], CM[2], 
			CM[3], CM[4], CM[4], CM[3], CM[2], CM[3], CM[1], CM[1], 
			CM[3], CM[2], CL[5], CL[7], CM[2], CM[1]	]

beat_2 = [	1, 1, 2, 2, 1, 1, 2, 2, 			# Beats of song 2, 1 means 1/8 beats
			1, 1, 2, 2, 1, 1, 3, 1, 
			1, 2, 2, 1, 1, 2, 2, 1, 
			1, 2, 2, 1, 1, 3 ]

def setup():
	GPIO.setmode(GPIO.BOARD)		# Numbers GPIOs by physical location
	GPIO.setup(Buzzer, GPIO.OUT)	# Set pins' mode is output
	global Buzz						# Assign a global variable to replace GPIO.PWM 
	Buzz = GPIO.PWM(Buzzer, 440)	# 440 is initial frequency.
	Buzz.start(50)					# Start Buzzer pin with 50% duty ration

def loop():
	while True:
		print ('\n    Playing song 1...')
		for i in range(1, len(song_1)):		# Play song 1
			Buzz.ChangeFrequency(song_1[i])	# Change the frequency along the song note
			time.sleep(beat_1[i] * 0.5)		# delay a note for beat * 0.5s
		time.sleep(1)						# Wait a second for next song.

		print ('\n\n    Playing song 2...')
		for i in range(1, len(song_2)):     # Play song 1
			Buzz.ChangeFrequency(song_2[i]) # Change the frequency along the song note
			time.sleep(beat_2[i] * 0.5)     # delay a note for beat * 0.5s

def destory():
	Buzz.stop()					# Stop the buzzer
	GPIO.output(Buzzer, 1)		# Set Buzzer pin to High
	GPIO.cleanup()				# Release resource

if __name__ == '__main__':		# Program start from here
	setup()
	try:
		loop()
	except KeyboardInterrupt:  	# When 'Ctrl+C' is pressed, the child program destroy() will be  executed.
		destory()