51 single chip microcomputer key control LED light status

Preface

Update the programming of the key module today

First look at the circuit diagram

You can see ,K1,K2,K3 When not pressed ,KEY1,KEY2,KEY3 Three interfaces are connected with vcc Unicom , At high level .
When K1,K2,K3 When pressed ,vcc Connect with the earth ,KEY1,KEY2,KEY3 All are low level .
To sum up, we can see that , Press the switch interface to 0, Release the switch as 1.

Our goal is to use k1,k2,k3 Each control LED The lamp L0,L1,L2 On and off , Press the switch and the corresponding light will light up , Release the switch and the light goes out .

Let's take another look LED Circuit diagram of

LED In the last article , It's just more here .
Let's take a look at the code ：

#include <STC15F2K60S2.H>
sbit LedSel=P2^3;
sbit Key1=P3^2;
sbit Key2=P3^3;
sbit Key3=P1^7;
void Init(){
    
	P2M0=0x08;
	P2M1=0x00;
	
	P0M0=0xff;
	P0M1=0x00;
	
	LedSel=1;
	P0=0;
}

void main(){
    
	Init();
	while(1){
    
		if(Key1==0)  
        P0=0x01;  
			else P0=0;
       
    if(Key2==0)  
        P0=0x02; 
			else P0=0;
       
    if(Key3==0)  
        P0 = 0x04; 
			else P0=0;
			} 
}
	

There is nothing obscure about the code , It is necessary to pay attention to writing else, Otherwise, the light will not go out after it is on .

The following is the effect of the code ：

VID_20220719_093750

Postscript
That's all for the key module , If you have any questions, welcome to communicate
To be continued ······