Based on 51 microcontroller buttons to control the speaker to produce a variety of sounds

Specific implementation functions:

The 51 microcontroller buttons control the speaker to emit a variety of sounds.

Design introduction

Introduction to 51 microcontroller

The 51 monolithic chip is a low-power, high-performance CMOS-8-bit microcontroller with 8K programmable Flash memory, making it a highly flexible and ultra-effective solution for many embedded control application systems.

The 51 series microcontrollers have the following standard features:

8k bytes Flash, 512 bytes RAM,

32-bit I/O port line, watchdog timer,

Built-in 4KB EEPROM,

MAX810 reset circuit,

Three 16-bit timer/counters,

A 6-vector 2-level interrupt structure,

Full duplex serial port.

In addition, in the idle mode of the 51 series, the CPU stops working and allows the RAM, timers/counters, serial ports, and interrupts to continue working. In power-down protection mode, the RAM contents are saved, the oscillator is frozen, and the microcontroller stops working until the next interrupt or hardware reset. The chip used in this design is compatible with all the following 51 series microcontrollers (including AT series and STC series).

Design ideas

Literature research method: collect and organize relevant research materials, read literature, and prepare for research;

Investigation and research method: Discover relevant existing problems and solutions through investigation, analysis, specific experiments and other methods;

Comparative analysis method: Compare the specific principles of different designs and the performance differences of the same type of sensors, and analyze the research status and development prospects of the system;

Software and hardware design method: realize the hardware through software and hardware design, and finally test whether each function meets the requirements.

Reference template for microcontroller design papers:

Worry-free Graduation | MCU Graduation Thesis Template

design content

Simulation diagram (protues8.7)

This design uses protues8.7 software to implement simulation design, as shown in the figure.

Note: Free sharing, please follow the picture below to draw the simulation yourself! !

protues8.7 software information and simulation solutions:

proteus8.7 installation and cracking tutorial (installation package included)

Solutions to common problems in protues simulation

Protues8.7 simple tutorial

Program (Keil5)

This design uses KEIL5 software to implement programming.

Note: All codes are shared for free, please create your own project! !

This design is written in C language, and the entire code is as follows:

#include 

#define uchar unsigned char

#define uint unsigned int

sbit BEEP = P3^7;

sbit K1 = P1^4;

sbit K2 = P1^5;

sbit K3 = P1^6;

sbit K4 = P1^7;

void DelayMS(uint x)

{

   uchart;

  while(x--)

  {

     for(t=0;t<120;t++);

  }

}

void Play(uchar t)

{

   uchar i;

  for(i=0;i<100;i++)

  {

     BEEP = ~BEEP;

    DelayMS(t);

  }

  BEEP = 0;

}

void main()

{

   P1 = 0xff;

  while(1)

  {

     if(K1==0) Play(1);

    if(K2==0) Play(2);

    if(K3==0) Play(3);

    if(K4==0) Play(4);

  }

}

The running result is as shown in the figure: