led_kai.pde

#define LED 13
#define BUTTON 7

int val;
int old_val;
int light;

void setup(){
  pinMode(LED, OUTPUT);
  pinMode(BUTTON, INPUT);
}

void loop(){
  old_val = val;
  val = digitalRead(BUTTON);
  
  if(old_val != val){
    if(val == HIGH){
      if(light == HIGH){
        digitalWrite(LED, LOW);
        light = LOW;
      }else{
        digitalWrite(LED, HIGH);
        light = HIGH;
      }
    }
  }
}