Using Raspberry Pi to drive buzzer

Objective:

In this project, we will use raspberry Pi to drive buzzer and make alert sound repeatedly.

Parts and Devices

1 x raspberry Pi3

1 x raspberry Pi  T-style extension

1 x buzzer

mouse and keyboard

HDMI cable and HDMI monitor(or LCD TV)

1 x breadboard

Circuit Graph:

Software Installation:

1)Install git core(if you have already installed git core, please skip this step). Please run following shell command in Pi terminal:

sudo apt-get install git-core

sudo apt-get update

sudo apt-get upgrade

2)Install wiringPi libary(if you have installed wiringPi, please skip this step). Please run following command in Pi terminal:

git clone git://git.drogon.net/wiringPi

cd wiringPi

./build

3)Download/compile buzzer_rpi.c and run the program as following:

wget http://osoyoo.com/wp-content/uploads/2016/09/buzzer_rpi.c

Note:  In buzzer_rpi.c file, the buzzer is connected to port no.24. However, connection graph shows the buzzer is connected to GPIO 19. This is because buzzer_rpi.c includes wiringPi library whose port number does not match GPIO number. port 24 is actually GPIO 19. You can use gpio readall to check gpio port mapping(result as per following graph)

compile and run the code by typing following commands:

gcc -Wall -o buzzer buzzer_rpi.c -lwiringPi

sudo ./buzzer

you will hear buzzer sound.

use “Ctrl+c “ to stop the program