Objective

After blinking the leds and Controlling them using switches, its time to make some noise using the buzzer. In the first part of the tutorial, we will beep the buzzer with a delay of 1sec. At the end we will control the buzzer using a switch.

Register Configuration

Please refer the below tutorial for basics of GPIO register configuration.

AVR I/O Register Configuration

Buzzer Beep Code

Below points needs to be considered for this example.

Include the io.h file as it has the definitions for all the PORT registers.
Include delay.h file to use the delay functions.
Configure the PORT as Output before writing any data to PORT pins.
Turn ON and OFF the buzzer with a delay of 1sec.

	#include <avr/io.h>
	#include <util/delay.h>

	int main()
	{
	DDRC = 0xff; // Configure PORTC as output

	while(1)
	{
	PORTC = 0xff; // Turn ON the Buzzer conneted to PORTC
	_delay_ms(1000); // Wait for some time
	PORTC = 0x00; // Turn OFF the Buzzer connected to PORTC
	_delay_ms(1000); // Wait for some time
	}
	return 0;
	}

view raw A0_Avr_Buzzer_Beep.c hosted with ❤ by GitHub

Switch And Buzzer Code

Below points needs to be considered for this example.

Include the io.h file as it has the definitions for all the PORT registers.
Configure PORTA as inputs to read the switch status.
Configure the PORTC as Output to turn ON/OFF the Buzzer.
Continuously read the switch status and control the buzzer accordingly.

	#include <avr/io.h>

	int main()
	{
	DDRC = 0xff; // Configure PORTC as output to connect Buzzer
	DDRA = 0x00; // Configure PORTA as Input to read the switchs
	PORTA = 0xff; // Enable The PullUps of PORTA.
	while(1)
	{
	PORTC = PINA; // Read the switch status and Turn ON/OFF the Buzzer
	}
	return 0;
	}