#define pinRelay1 27
#define pinRelay2 26

void setup()
{
  Serial.begin(115200);
  pinMode (pinRelay1, OUTPUT);
  pinMode (pinRelay2, OUTPUT);
}

void loop()
{
Serial.println("Liga/Desliga Azul");
digitalWrite(pinRelay1, HIGH);
digitalWrite(pinRelay2, LOW);
delay(500);
Serial.println("Liga/Desliga Amarelo");
digitalWrite(pinRelay1, LOW);
digitalWrite(pinRelay2, HIGH);
delay(500);
}