51 MCU PWM modulation to achieve simulated breathing light-EEWORLD

Using PWM modulation to achieve the breathing light effect

. Without further ado,

the simulation schematic diagram is as follows

The microcontroller source program is as follows:

//Function: simulate breathing light through PWM modulation

//Name: Breathing Light

#include //Call the header file containing 51 special registers

#define uchar unsigned char // for uchar substitute for unsigned char

#define uint unsigned int // for uint alternative to unsigned int

void delayms(int xms) //Pulse width modulation function

{

while(xms--);

}

void main() //Main function

{

uint T=400,N=0; //define cycle

while(1)

{

for(N=1;N {

P1=0x00;

delayms(N);

P1=0xff;

delayms(T-N);

}

P1=0xff;

for(N=T-1;N>0;N--) //gradually change from bright to dark

{

P1=0x00;

delayms(N);

P1=0xff;

delayms(T-N);

}

delayms(N+10); //Increase the extinguishing effect seen

}

Reference address：51 MCU PWM modulation to achieve simulated breathing light

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

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