int motorPin1 = D0;
int motorPin2 = D1;
int ledPin = D9;

void setup() {
  pinMode(motorPin1, OUTPUT);
  pinMode(motorPin2, OUTPUT);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // Compressor ON
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, LOW);
  digitalWrite(ledPin, HIGH);
  delay(3000);

  // Compressor OFF
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, LOW);
  digitalWrite(ledPin, LOW);
  delay(3000);
}