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Single chip microcomputer--flowing light production

Publisher:幸福的家园Latest update time:2016-01-19 Source: eefocus Reading articles on mobile phones Scan QR code
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Task requirements: Use the microcontroller P1 port to control 8 light-emitting diodes to light up in a cycle
 Component name  parameter    quantity
 MCU Minimum System    1
 DC power supply  5V  1
 led    8
 resistance  1kΩ  8

Circuit Schematic

Power module: Use 4 No. 5 batteries in series to provide 6V DC power, which is converted into 5V DC power through the LM2940 power chip.

8 LEDs, made into a small board for easy use, using common anode connection


Program source code

//Program: ex3_7.c
//Function: A flow light control program implemented using a loop structure
#include    //Includes header file REG51.H
void delay(unsigned char i);   //Delay function declaration
void main()    //Main function
{
  unsigned char i,w;
  while(1) {
    w=0x01;     //The initial value of the signal light display word is 01H
    for(i=0;i<8;i++)
    {
      P1=~w;    //After the display word is inverted, send it to port P1
      delay(200);   //Delay
       w<<=1;    //The display word is shifted left by one position         
    }
           }
}
//Function name: delay
//Function function: Implement software delay
//Formal parameter: unsigned char i;
//          i controls the number of outer loops of the empty loop, a total of i*255 loops
//Return value: None
void  delay(unsigned char i)  //Delay function, unsigned character type variable i is the formal parameter
{
   unsigned char j,k;   //Define unsigned character variables j and k
   for(k=0;k //Double for loop statement to implement software delay
     for(j=0;j<255;j++);
}
 

Reference address：Single chip microcomputer--flowing light production

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He Limin Column Microcontroller and Embedded Systems Bible

Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.

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