Four key pronunciations designed by single chip microcomputer-EEWORLD

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Circuit Diagram:

Program implementation functions:

To achieve four buttons to emit different tones, the code is as follows:

#include

#define uchar unsigned char

#define uint unsigned int

sbit BEEP = P3^7; //Assign P3.7 interface to BEEP (connect to speaker)

sbit K1 = P1^4; //Assign P1.4 interface to K1

sbit K2 = P1^5; //Assign P1.5 interface to K2

sbit K3 = P1^6; //Assign P1.6 interface to k3

sbit K4 = P1^7; //Assign the p1.7 interface to K4

//Delay

void DelayMS(uint x)

{

uchar t;

while(x--)

{

for(t=0;t<120;t++);

}

void Play(uchar t)

{

uchar i;

for(i=0;i<100;i++)

{

BEEP = ~BEEP; //Invert once every half cycle

DelayMS(t); //delay

}

BEEP = 0;

}

void main()

{

P1 = 0xff;

while(1)

{

if(K1==0) Play(1);

if(K2==0) Play(2);

if(K3==0) Play(3);

if(K4==0) Play(4);

}

Reference address：Four key pronunciations designed by single chip microcomputer

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