【Arduino】3.按键的使用进阶

本文为旧博客迁移的文章

代码1

#define LED 13  
#define BUTTON 7  
int val=0;  
 
int state=0;
  
void setup() {  
	pinMode(LED,OUTPUT);  
	pinMode(BUTTON,INPUT);  
}  
  
void loop() {  
val=digitalRead(BUTTON);  
  if(val==HIGH){  
      state=1-state;
  }
  if(state==1){
    digitalWrite(LED,HIGH);
  } else{
    digitalWrite(LED,LOW); 
  }
}

代码2

#define LED 13  
#define BUTTON 7  
 
int val=0;  
int old_val=0;  
int state=0;
  
void setup() {  
	pinMode(LED,OUTPUT);  
	pinMode(BUTTON,INPUT);  
}  
  
void loop() {  
	val=digitalRead(BUTTON);  
    
	if((val==HIGH) && (old_val==LOW)){  
		state=1-state;
		delay(10);
	} 
 
	old_val=val;
  
	if(state==1){
		digitalWrite(LED,HIGH);
	} else{
		digitalWrite(LED,LOW); 
	}
}