unsigned long interval=120000; // 2 MENIT
unsigned long previousMillis=0; // millis() returns an unsigned long.

#define RELAY 12
#define SENSOR1 11

void setup() {
 pinMode(SENSOR1, INPUT);
 pinMode(RELAY, OUTPUT);
}

void loop() {
if(SENSOR1==HIGH){
 unsigned long currentMillis = millis(); // grab current time
 if ((unsigned long)(currentMillis - previousMillis) >= interval) {
   digitalWrite(RELAY, HIGH); // AKTIFKAN RELAY
   previousMillis = millis();
 }
}

}