Get tutorials /Raspberry Pi/ Sensor Kit V2.0 for Raspberry Pi B+

Lesson 10 Buzzer Module


 

 

Introduction

Buzzers can be categorized as active and passive ones (See the following picture).


             


Components

- 1 * Raspberry Pi

- 1 * Breadboard

- 4 * Jumper wires (Male to Male, 2 red and 2 black)

- 1 * Network cable (or USB wireless network adapter)

- 1 * Passive buzzer module

- 1 * Active buzzer module

- 1 * 3-Pin anti-reverse cable

 

Experimental Principle

Place the pins of two buzzers face up and you can see the one with a green circuit board is a passive buzzer, while the other with a black tape, instead of a board, is an active buzzer, as shown below.


 

Active buzzer                        Passive buzzer


The difference between an active buzzer and a passive buzzer is:

An active buzzer has a built-in oscillating source, so it will make sounds when electrified. But a passive buzzer does not have such source, so it will not beep if DC signals are used; instead, you need to use square waves whose frequency is between 2K and 5K to drive it. The active buzzer is often more expensive than the passive one because of multiple built-in oscillating circuits.  

The schematic diagram is as shown below:


 

 

Experimental Procedures

Active Buzzer

Note:

The active buzzer has built-in oscillating source, so it will beep as long as it is wired up, but it can only beep with fixed frequency.

Step 1: Build the circuit


Raspberry Pi

T-Cobbler

Active Buzzer Module

GPIO0

GPIO17

SIG

5V

5V0

VCC

GND

GND

GND

 

For C language users:

Step 2: Change directory

cd /home/pi/SunFounder_SensorKit_for_RPi2/C/10_active_buzzer/

Step 3: Compile

gcc active_buzzer.c –lwiringPi

Step 4: Run

sudo ./a.out


For Python users:

Step 2: Change directory

 cd /home/pi/SunFounder_SensorKit_for_RPi2/Python/

Step 3: Run

sudo python 10_active_buzzer.py

 

Now you can hear the active buzzer beeping.


 

Passive Buzzer

Step 1: Build the circuit


Raspberry Pi

T-Cobbler

Passive Buzzer Module

GPIO0

GPIO17

SIG

5V

5V0

VCC

GND

GND

GND

 

 

For C language users:

Step 2: Change directory

cd /home/pi/SunFounder_SensorKit_for_RPi2/C/10_passive_buzzer/

Step 3: Compile

gcc passive_buzzer.c –lwiringPi

Step 4: Run

sudo ./a.out


For Python users:

Step 2: Change directory

 cd /home/pi/SunFounder_SensorKit_for_RPi2/Python/

Step 3: Run

sudo python 10_passive_buzzer.py

 

Now you can hear the passive buzzer playing music.

 

 

 

 

C Code

Active Buzzer 


#include <wiringPi.h>
#include <stdio.h>

#define BuzzerPin      0

int main(void)
{
	if(wiringPiSetup() == -1){ //when initialize wiring failed,print messageto screen
		printf("setup wiringPi failed !");
		return 1; 
	}
//	printf("linker LedPin : GPIO %d(wiringPi pin)\n",VoicePin); //when initialize wiring successfully,print message to screen
	
	pinMode(BuzzerPin,  OUTPUT);

	while(1){
			digitalWrite(BuzzerPin, HIGH);
			delay(100);
			digitalWrite(BuzzerPin, LOW);
			delay(100);	
	}

	return 0;
}



 

Passive Buzzer 


#include <wiringPi.h>
#include <softTone.h>
#include <stdio.h>

#define BuzPin    0


#define  CL1  131
#define  CL2  147
#define  CL3  165
#define  CL4  175
#define  CL5  196
#define  CL6  221
#define  CL7  248

#define  CM1  262
#define  CM2  294
#define  CM3  330
#define  CM4  350
#define  CM5  393
#define  CM6  441
#define  CM7  495

#define  CH1  525
#define  CH2  589
#define  CH3  661
#define  CH4  700
#define  CH5  786
#define  CH6  882
#define  CH7  990

int song_1[] = {CM3,CM5,CM6,CM3,CM2,CM3,CM5,CM6,CH1,CM6,CM5,CM1,CM3,CM2,
				CM2,CM3,CM5,CM2,CM3,CM3,CL6,CL6,CL6,CM1,CM2,CM3,CM2,CL7,
				CL6,CM1,CL5};

int beat_1[] = {1,1,3,1,1,3,1,1,1,1,1,1,1,1,3,1,1,3,1,1,1,1,1,1,1,2,1,1,
				1,1,1,1,1,1,3};


int song_2[] = {CM1,CM1,CM1,CL5,CM3,CM3,CM3,CM1,CM1,CM3,CM5,CM5,CM4,CM3,CM2,
				CM2,CM3,CM4,CM4,CM3,CM2,CM3,CM1,CM1,CM3,CM2,CL5,CL7,CM2,CM1
				};

int beat_2[] = {1,1,1,3,1,1,1,3,1,1,1,1,1,1,3,1,1,1,2,1,1,1,3,1,1,1,3,3,2,3};

int main(void)
{
	int i, j;

	if(wiringPiSetup() == -1){ //when initialize wiring failed,print messageto screen
		printf("setup wiringPi failed !");
		return 1; 
	}

	if(softToneCreate(BuzPin) == -1){
		printf("setup softTone failed !");
		return 1; 
	}

	while(1){
		printf("music is being played...\n");

		for(i=0;i<sizeof(song_1)/4;i++){
			softToneWrite(BuzPin, song_1[i]);	
			delay(beat_1[i] * 500);
		}

		for(i=0;i<sizeof(song_2)/4;i++){
			softToneWrite(BuzPin, song_2[i]);	
			delay(beat_2[i] * 500);
		}	
	}

	return 0;
}



Python Code

Active Buzzer 


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

Buzzer = 11    # pin11

def setup(pin):
	global BuzzerPin
	BuzzerPin = pin
	GPIO.setmode(GPIO.BOARD)       # Numbers GPIOs by physical location
	GPIO.setup(BuzzerPin, GPIO.OUT)
	GPIO.output(BuzzerPin, GPIO.HIGH)

def on():
	GPIO.output(BuzzerPin, GPIO.LOW)

def off():
	GPIO.output(BuzzerPin, GPIO.HIGH)

def beep(x):
	on()
	time.sleep(x)
	off()
	time.sleep(x)

def loop():
	while True:
		beep(0.5)

def destroy():
	GPIO.output(BuzzerPin, GPIO.HIGH)
	GPIO.cleanup()                     # Release resource

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



 

Passive Buzzer 


#!/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()





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Apr 14 2017 at 09:25 am



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