byte LED_1=13; //red led
byte LED_2=12; //yellow led
byte LED_3=11; //red led
bool state;
unsigned long late1,late2,late3; //wait time 



void setup() {
  
  pinMode(13,LED_1 OUTPUT);
  pinMode(12,LED_2 OUTPUT);
  pinMode(11,LED_3 OUTPUT);

  digitalWrite(LED_1 LOW);
  digitalWrite(LED_2 LOW);
  digitalWrite(LED_3 LOW);

}

void loop() {
  if(millis()-late1 >=1000) {
    late1 =millis();
state = !state;
digitalRead()digitalWrite(LED_1, state);
    //digitalWrite(LED_1,!digitalRead(LED_1));
  }

}