AVR ATmega32 Mini Development Board – Interfacing Buzzer

AVR ATmega32 Mini Development Board has an on-board buzzer connected to port pin PC7 via jumper J12. To use the buzzer, it is necessary to short the jumper. If PC7 is to be used for any other purpose, then the jumper should be left open.

Sample code to test the on-board buzzer is given below. As per the code given below, when the switch SW1 is pressed, it generates interrupt and toggles the status of buzzer.

Note: To use buzzer, don’t forget to short jumper J12. Leaving it open frees PC7 and it can be used for any other desired purpose.

Schematic

Sample Code

/********************************************************
                      HEADER FILES
*********************************************************/
#include<avr/io.h>
#include<avr/interrupt.h>

/********************************************************
                      MAIN FUNCTION
*********************************************************/
int main()
{
 DDRC |= 0X80;       /* PC7 configured as output        */
 DDRD &= 0XFC;       /* PD2 PD3 configured as input     */
 SREG  = 0X80;       /* Global Interrupt Enable         */
 MCUCR = 0X0F;       /* Rising edge generates interrupt */
 GICR  = 0XC0;       /* INT0 INT1 activated             */
 while(1);
}

/********************************************************
                 INTERRUPT SERVICE ROUTINE
*********************************************************/
ISR(_VECTOR(1))      /* External Interrupt Request 0    */
{
 GIFR   = 0XC0;      /* Interrupt Flag Clear            */
 PORTC ^= (0x80);
}

/*******************  END OF PROGRAM  *******************/

/********************************************************

HEADER FILES

*********************************************************/

#include<avr/io.h>

#include<avr/interrupt.h>

/********************************************************

MAIN FUNCTION

*********************************************************/

int main()

{

DDRC |= 0X80; /* PC7 configured as output */

DDRD &= 0XFC; /* PD2 PD3 configured as input */

SREG = 0X80; /* Global Interrupt Enable */

MCUCR = 0X0F; /* Rising edge generates interrupt */

GICR = 0XC0; /* INT0 INT1 activated */

while(1);

}

/********************************************************

INTERRUPT SERVICE ROUTINE

*********************************************************/

ISR(_VECTOR(1)) /* External Interrupt Request 0 */

{

GIFR = 0XC0; /* Interrupt Flag Clear */

PORTC ^= (0x80);

}

/******************* END OF PROGRAM *******************/

Topics related to AVR ATmega32 Mini Development Board

Resources

Softwares
- AVR Studio
Datasheets
- ATmega32
- MCP 9700
- LM 7805
- LD 1117
- MAX 232

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