int rele = 7;
bool Konec;

void setup() {
 pinMode(rele, OUTPUT);
 Konec = LOW;
 digitalWrite(rele, LOW);
}

void loop() {
  do {
  }while (millis()<2000);
  i = 1
  interval = 2000
  do {
    doba = interval
    interval = interval/2
    mez = i+3
    j = 1
do {

} while (j<=mez)
  } while (i<=4)
    digitalWrite(rele, HIGH);
    delay(3000);
    digitalWrite(rele, LOW);
  }