int LED_PIN_1= 2;
int LED_PIN_2 = 4;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(LED_PIN_1, OUTPUT);
  pinMode(LED_PIN_2, OUTPUT);
 digitalWrite(LED_PIN_1, LOW);
 digitalWrite(LED_PIN_2, LOW);
}

void loop() {
digitalWrite(LED_PIN_1, HIGH);
digitalWrite(LED_PIN_2, LOW);
delay(1000);
Serial.println("Led1 is ON");
digitalWrite(LED_PIN_1, LOW);
digitalWrite(LED_PIN_2, HIGH);
Serial.println("Led2 is On");
delay(1000);
}