51 single chip microcomputer uses an independent button to control the buzzer-EEWORLD

After the key is pressed for the first time, the buzzer sounds;

After pressing the key for the second time, the buzzer stops.

#include

sbit beep=P1^5;

sbit key=P3^1;

unsigned int mode; //define a mode

void delay(unsigned int i)

{

while(i--);

}

void voice()

{

if(mode)

{

beep=~beep;

delay(100); //Changing the delay can make the buzzer emit different sounds

}

else

{

beep=0;

}

void main()

{

while(1)

{

voice();

if(key==0)

{

delay(1000);

if(key==0)

{

mode=!mode;

while(!key);

}

Reference address：51 single chip microcomputer uses an independent button to control the buzzer

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

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