Problems with STM32 and passive buzzer playing sound

程序会不会

Problems with STM32 and passive buzzer playing sound [Copy link]

 

The pin drives the passive buzzer via PWM to produce different sounds

Looking at the examples on the Internet, the beat frequency and other parameters corresponding to the sound file are placed in an array and then called one by one to play the desired sound.

Now the question is how to get the beat and frequency parameters corresponding to a piece of audio

How do you get this data from MP3 files downloaded from the Internet?

wangerxian

MP3 files downloaded from the Internet cannot be converted into this kind of data. There are some audio data sharing on the Internet that you can use. Some development boards also come with audio data files.

maychang

The international standard for the sound a in the small letter group is 440Hz. All pitches can be obtained from this.

As for the beat, it is the duration of a certain sound.

jiaxxi

You can use malab to process audio files

jiaxxi

You can use matlab to do fft analysis on audio files

程序会不会

wangerxian posted on 2023-8-11 16:54 The MP3 downloaded from the Internet cannot be converted into this kind of data. There are some audio data shared on the Internet that you can use. Some development boards also have audio...

My current project is to compare the detection value with the alarm value, and make different sounds according to the difference. These sounds are only available in MP3 files

程序会不会

maychang posted on 2023-8-11 17:00 The international standard for a group of a sounds in small letters is 440Hz. From this, all pitches can be obtained. As for the beat, it is the duration of a certain sound.

what does it mean?

led2015

Use audio analysis software or use a programming language and corresponding audio processing library (such as Python's Librosa library)

秦天qintian0303

First edit the audio to get the desired segment, and then convert it into a C language array through Python

wangerxian

Will the program be published on 2023-8-12 08:12 My current project is to compare the detection value with the alarm value, and make different sounds according to the difference. These sounds are only available in MP3 files

I don't know if there is a tool that can write code to make sounds, so that you can test the sound corresponding to the code you wrote. I don't think there is a direct conversion tool.

damiaa

PCM encoding.

lugl4313820

I hope the OP can learn it and post again so I can learn from it too!

digital2Fox

Let's look at the simple notation, do re mi, and then map it to different frequencies. They are all standard middle C, which seems to be 440Hz.

吾妻思萌

I suggest you read this article about MIDI. If you want to use software to view the spectrum, you can search for Adobe software. I recommend Goldenwave.

freebsder

There is a lot of this kind of data on the Internet, and chatgpt can also give it to you directly.

yhk_1987

The most important thing is practice. You must have a hardware platform that can show you. Without this,

ylyfxzsx

The following figure shows the circuit diagram of the connection between the buzzer and STM32. The "PBeep" in the program is the macro definition of the "BEEP" IO port in the figure, which is usually defined in the header file:
#define PBeep PBout(8)

First, find a score online, look carefully, and figure out two arrays, one for pitch and one for note length.
Check the score, as follows:

When it comes to converting the musical notation to an array, you can see the benefit of choosing a nursery rhyme. All the tones are in the tone[] array, that is, between the bass 7 and the treble 5. Let's look at this array again:

// Low 7 1 2 3 4 5 6 7 High 1 High 2 High 3 High 4 High 5 Silent
uc16 tone[] = {247,262,294,330,349,392,440,494,523,587,659,698,784,1000}; // Audio data table

#include "beep.h"

int melody[] = {50, 50, 50, 50, 200, 200, 200, 400, 400, 500, 500, 500};

void BEEP_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //Enable port A clock
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //Push-pull output
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //Speed 50MHz
GPIO_Init(GPIOB, &GPIO_InitStructure); //Initialize GPIOD3,6
GPIO_SetBits(GPIOB,GPIO_Pin_5);
}

void Sound(u16 frq)
{
u32 time;
if(frq != 1000)
{
time = 500000/((u32)frq);
PBeep = 1;
delay_us(time);
PBeep = 0;
delay_us(time);
}else
delay_us (1000);
}
void Sound2(u16 time)
{
PBeep = 1;
delay_ms(time);
PBeep = 0;
delay_ms(time);
}
void play_successful(void)
{
int id=0;
for(id = 0;id < 12 ;id++)
{
Sound2(melody[id]);
}
}
void play_failed(void)
{
int id=0;
for(id = 11 ;id >=0 ;id--)
{
Sound2(melody[id]);
}
}
void play_music(void)
{
// low 7 1 2 3 4 5 6 7 High 1 High 2 High 3 High 4 High 5 Silent
uc16 tone[] = {247,262,294,330,349,392,440,294,523,587,659,698,784,1000}; //Audio data table
//Love song in the world
u8 music[] = {5,5,6, 8,7,6,5,6,13,13,//tone
5,5,6,8,7,6,5,3,13,13,
2,2,3,5,3,5,6 ,3,2,1,
6,6,5,6,5,3,6,5,13,13,

5,5,6,8,7,6,5,6,13,13,
5,5,6,8,7,6,5,3,13,13,
2,2,3,5,3, 5,6,3,2,1,
6,6,5,6,5,3,6,1,

// time 2,4,2,2,2,2,2,8,4 , 4, 2,4,2,4,2,2,4,2,2,8
, 2,4,2,2,2,2,2,8,4 ,4,

2,4,2,2,2,2,2,8,4, 4,
2,4,2,2,2,2,2,8,4, 4,
2,4,2,4,2, 2,4,2,2,8,
2,4,2,2,2,2,2,8,

4, 2,2,2, 4, 2,2,2, 2,2,8,
4, 2,2,2,4,2,2,2,2,2,8,
4, 2,2, 2,4,2,2,5,2,6,2,4,
2,2 ,2,4,2,4,2,2,12};
u32 yanshi;
u16 i,e;
yanshi = 10;
for(i=0;i<sizeof(music)/sizeof(music[0]);i++){
for(e=0;e<((u16)time)*tone[music ]/yanshi;e++){
Sound((u32)tone[music]);
}
}
}

#ifndef __BEEP__H
#define __BEEP__H

#include "sys.h"
#include "stdlib.h"
#include "delay.h"

//Define GPIOB bit address variable macro, bit input macro, output macro
#define PBeep PBout(5)

void BEEP_Init(void);
void Sound(u16 frq);
void Sound2(u16 time);
void play_music(void);
void play_successful(void);
void play_failed(void);

#endif