int led_pin1 = 26;
int led_pin2 = 27;
int led_pin3 = 14;

void setup() {
  Serial.begin(9600);
  pinMode(led_pin1, OUTPUT);
  pinMode(led_pin2, OUTPUT);
  pinMode(led_pin3, OUTPUT);
}
void loop() {
  digitalWrite(led_pin1, HIGH);
  digitalWrite(led_pin2, HIGH);
  digitalWrite(led_pin3, HIGH);
  Serial.println("LED ON");
  delay(1000);
  digitalWrite(led_pin1, LOW);
  digitalWrite(led_pin2, LOW);
  digitalWrite(led_pin3, LOW);
  Serial.println("LED OFF");
  delay(1000);
}