51 Study Day 2 - 2. Flowing Light Design and Buzzer Sound

2. Flowing light design and buzzer sound

1. Simple delay program:

Use the while() loop to achieve a delay effect

#include

void main()

{

   sbit D1=p1^0; //declare a variable, set p0 equal to D1

   int=a；

   while(1) //This is an infinite loop

  {

      a=500; // indicates time delay

     D1=0; // indicates low level, i.e. the light is off

     while (a--); // means a is decremented to 0 and the following program is executed

     a=500；

    D1=1；

     while（a--）；

   }

}

2. Subroutine call:

Design a delay function first, then call it directly!

#include

#define uint unsigned char //This is a macro definition. In the future, you can directly input uahr using char without declaring it again!

#defne uint unsigned int

sbit D1=P1^0;

void delay(); //The main function calls the sub-function, declare the function first, a function without parameters!

void main()

{

  D1=0;

  delay();

  D1=1;

  delay();

}

void delay()//This is a delay function to control x, y can control the delay time! No parameters!

{

uint x，y；

for（x=100；x>0；x--）

           for（y=200；y>0；y--）

}

Sub-function with parameters: more convenient to adjust.

#include

#define uint unsigned char //This is a macro definition. In the future, you can directly input uahr using char without declaring it again!

#defne uint unsigned int

sbit D1=P1^0;

void delay(uint z);//The main function calls the sub-function, declare the function first, the function with parameters!

void main()

{

D1=0;

delay(600);

D1=1;

delay(600);

}

void delay(uint z) //This is a delay function to control x, y can control the delay time! With parameters!

{

uint x，y；

for（x=100；x>0；x--）

        for（y=z；y>0；y--）

}

3. Flowing water lamp design

A running light has 8 pieces, corresponding to 8 bits, and the binary representation is: 1111 1110 ~1111 1101~1111 1011~~~ This forms a running light (0 is bright)

At this time, you need to call the left shift function: to implement the above pipeline

#include

#include "instrins.h//Left shift function header file

#define uchar unsigned char //This is a macro definition. In the future, you can directly input uchahr using char without declaring it again!

#defne uint unsigned int

 uchar=temp; //define an eight-bit variable

void delay(uint z);//The main function calls the sub-function, declare the function first, the function with parameters!

void main()

{

    temp=0xfe; //0xfe means: 1111 1110 defines P1 port

    P1=temp；

    while（1）

    {

    temp=_crol_(temp,1);//Call left shift function

    delay（1000）；

    P1=temp；

    }

}

void delay(uint z) //This is a delay function to control x, y can control the delay time! With parameters!

{

uint x，y；

for（x=z；x>0；x--）

        for（y=z；y>0；y--）

}

4. Buzzer design

PNP transistor: When b is low level, the ec circuit forms a voltage drop, and the buzzer sounds. When b is high level, there is no voltage drop and the buzzer does not sound. (b is controlled by the microcontroller)

Method: Just control the buzzer io port directly!

#include

#include "instrins.h//Left shift function header file

#define uchar unsigned char //This is a macro definition. In the future, you can directly input uchahr using char without declaring it again!

#defne uint unsigned int

 uchar=temp; //define an eight-bit variable

sbit feng = P2^3; //The third bit of P2 port is the buzzer port

void main()

{

    temp=0xfe; //0xfe means: 1111 1110 defines P1 port

    P1=temp；

    feng=0;//At this time, the buzzer keeps ringing and the running light starts moving!

   while（1）

      {

      temp=_crol_(temp,1);//Call left shift function

      delay（60）；

      P1=temp；

       }

}

void delay(uint z) //This is a delay function to control x, y can control the delay time! With parameters!

{

uint x，y；

for（x=100；x>0；x--）

        for（y=z；y>0；y--）

}

加油！！！你一定行！