#define LED 26
#define Relay 25 

const int periodLED = 5000;
const int periodRelay = 10000;

int current;
int previousLED = 0;
int previousRelay = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(LED, OUTPUT);
  pinMode(Relay, OUTPUT);
}

void loop() {
  current = millis();
  if((current - previousLED) >= periodLED){
    Serial.print("Time-LED: ");
    Serial.println(current - previousLED);
    previousLED = current;
    digitalWrite(LED, HIGH);
    delay(1000);
    digitalWrite(LED, LOW);
  }

  if((current - previousRelay) >= periodRelay){
    Serial.print("Time LED(Relay): ");
    Serial.println(current - previousRelay);
    previousRelay = current;
    digitalWrite(Relay, HIGH);
    delay(3000);
    digitalWrite(Relay, LOW);
  }
}