Program design of switch control alarm

Name: Switch Control Alarm

Description: Use K1 switch to control the alarm, program control P1.0 output two different frequency sounds, simulate very realistic alarm effect

*/

#include

#define uchar unsigned char

#define uint unsigned int

Sbit SPK=P1^0;

Sbit K1=P1^7;

// sound function

Void Alarm(uchar t)

{

Uchar i,j;

For(i=0;i<200;i++)

{

SPK=~SPK;

For(j=0;j

}

Void main()

{

SPK=0;

While(1)

{

If(K1==1)

{

Alarm(90);

Alarm(120);

}

}

}

Program design of switch control alarm

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