Buzzer experiment based on stm32f103zet6 library function

Buzzer

type

elite STM32 The buzzer on the development board is an electromagnetic active buzzer .

Passive

The active power here doesn't refer to the power supply “ Source ”, It's about whether there's a self oscillating circuit , The active buzzer has its own oscillation circuit , It will be electrified ; The passive buzzer does not have its own oscillation circuit , It has to be provided externally 2~5Khz Right and left square wave drive , To make a sound .

Driving mode

We don't have to STM32 Of IO Direct drive buzzer , It is Drive the buzzer after current expansion through triode

Hardware design

Schematic diagram

The driving signal of the buzzer is connected to STM32 Of PB8 On

In the picture we use a NPN triode （S8050） To drive the buzzer ,R33 It is mainly used to prevent the buzzer from misfiring The sound . When PB.8 When the output is high , The buzzer will sound , When PB.8 When the output is low , The buzzer stops .

stay BEEP A very small current is input through the amplification of the triode , Make the end connected to the buzzer output the amplified current , Can make the buzzer ring

software design

beep.c

#include "beep.h"

void BEEP_Init(void)
{
    
 
 GPIO_InitTypeDef  GPIO_InitStructure;
 	
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);	 // Can make  GPIOB  Port clock  
 
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;				 //BEEP-->GPIOB.8  port configuration  
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; 		 // Push pull output  
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;	   // Speed is  50MHz 
 GPIO_Init(GPIOB, &GPIO_InitStructure);	 // Initialization according to parameters  GPIOB.8 
 
 GPIO_ResetBits(GPIOB,GPIO_Pin_8);// Output  0, Turn off the buzzer output  
}

The design here is mainly to set GPIO and LED The configuration of is roughly the same

beep.h

#ifndef __BEEP_H 
#define __BEEP_H 

#include "sys.h" // Buzzer port definition  

#define BEEP PBout(8) // BEEP, Buzzer interface  

void BEEP_Init(void);     // initialization  
          
#endif 

Here, a bit band operation is used to realize a certain IO Port output control ,BEEP On behalf of Watch PB8 The output state of . We just need to make BEEP=1, You can make the buzzer sound

main.c

#include "sys.h" 
#include "delay.h" 
#include "led.h" 
#include "beep.h" 

int main(void)  
{
      
	delay_init();          // Delay function initialization  
	LED_Init();       // Initialization and  LED  Connected hardware interface  
	BEEP_Init();            // Initialize the buzzer port  
	while(1)  
	{
       
		LED0=0;   
		BEEP=0;       
		delay_ms(300);   
		LED0=1;      
		BEEP=1;     
		delay_ms(300);  
	}  
}