Microcontroller C language programming: doorbell designed with timer-EEWORLD

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/* Name: Doorbell designed with timer

Description: When the button is pressed, the buzzer emits a doorbell sound.

#include

#define uchar unsigned char

#define uint unsigned int

sbit Key=P1^7;

sbit DoorBell=P3^0;

if p=0;

//Main program

void main()

{

DoorBell=0;

TMOD=0x00; //T0 mode 0

TH0=(8192-700)/32; //700us timing

TL0=(8192-700)%32;

IE=0x82;

while(1)

{

if(Key==0) //Press the button to start the timer

{

TR0=1;

while(Key==0);

}

}[page]

//T0 interrupt controls the dot matrix screen display

void Timer0() interrupt 1

{

DoorBell=~DoorBell;

p++;

if(p<400) //If you need to prolong the sound, you can adjust 400 and 800

{

TH0=(8192-700)/32; //700us timing

TL0=(8192-700)%32;

}

else if(p<800)

{

TH0=(8192-1000)/32; //1ms timing

TL0=(8192-1000)%32;

}
else

{

TR0=0;

p=0;

}

Microcontroller C language programming: doorbell designed with timer

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