PIC Microcontroller - Buzzer Usage Example

PIC mid-range microcontroller buzzer schematic diagram:

Example of use:

/****************************************************** ****************************
* Jumper connection: short-circuit P2 2 and 3
* Function description: Passive buzzer sound
*************************************************** *******************************/
#include 
#include 
 
#define uint8 unsigned char
#define uint16 unsigned int
 
__CONFIG(WDTDIS & LVPDIS & HS & PWRTDIS & BORDIS); //Set configuration bits
//WDTDIS:disable watchdog timer
//LVPDIS: low voltage programming disabled
//HS:high speed crystal/resonator
//PWRTDIS:disable power up timer
//BORDIS:disable brown out reset
 
/***************************Declare function*******************************************/
 
void DelayUS(uint8 delay);
 
/****************************************************** ****************************
* Function name: DelayUS(uint8 delay)
* Function: microsecond delay for 20MHZ
* Input parameter: delay
* Return: None
*************************************************** *******************************/
 
void DelayUS(uint8 delay)
{
	while(--delay);
}
 
/****************************************************** *****************************
* Function name: main(void)
* Function: drive the passive buzzer to sound
* Input parameters: None
* Return: None
*************************************************** *******************************/
 
void main(void)
{	
	ADCON1 = 0x86; //PORTA is set as digital IO port
	TRISA0 = 0; //RA0 is set to output mode
	while(1)
	{	
		RA0 = 1;
		DelayUS(400);
		RA0 = 0;
		DelayUS(400);					    	
	}
}