int led_red = 23;
int led_yellow = 19;
int led_green = 18;

void setup() {
  // put your step code here,to run once:
 pinMode(led_red,OUTPUT);
 pinMode(led_yellow, OUTPUT);
 pinMode(led_green, OUTPUT);

 Serial.begin(9600);
 Serial.println("TESTING.1!");
}


 void loop() {
   // put you main code here, to run sepeatedly:
Serial.println("ON");
digitalWrite(led_red, HIGH);
digitalWrite(led_yellow, HIGH);
digitalWrite(led_green, HIGH);
delay(200);
Serial.println("OFF");
digitalWrite(led_red, LOW);
digitalWrite(led_yellow, LOW);
digitalWrite(led_green, LOW);
delay(200);
}