byte relay = 13;
byte button = 9;
byte led = 10;
unsigned long lastmillis = 0;

void setup() {
pinMode(relay, OUTPUT);
pinMode(button, INPUT);
pinMode(led, OUTPUT);
Serial.begin(9600);
}


void loop() {

  
  digitalWrite(led, HIGH);
  digitalWrite(led, LOW)
  if(digitalRead(button) == HIGH)
  {
    lastmillis = millis();
    Serial.println(millis());
    digitalWrite(relay,HIGH);
  }
  if(millis() > lastmillis + 10000){
    digitalWrite(relay,LOW);}
}

/*unsigned long currentTime;
unsigned long eventInterval = 500;
unsigned long previousTime = 0;
unsigned long lastStateChange = 0;

const int relayTime = 5 * 1000;
const byte relayPIN = 13;
const byte ledPIN = 12;
const byte buttonPIN = 9;
bool ledState = true;
int button;


void setup() {
  Serial.begin(9600);
  pinMode(relayPIN, OUTPUT);
  pinMode(ledPIN, OUTPUT);
  pinMode(buttonPIN, INPUT);
  digitalWrite(ledPIN, ledState);
}


void loop() {
  currentTime = millis();
  button = LOW;
  button = digitalRead(buttonPIN);
  Serial.println(button);

  if(button == HIGH) {
    digitalWrite(relayPIN, HIGH);
    lastStateChange = millis();
  }
  if(millis() > lastStateChange + relayTime) {
    digitalWrite(relayPIN, LOW);
  }

  if (currentTime - previousTime >= eventInterval) {
    ledState = !ledState;
    digitalWrite(ledPIN, ledState);
    previousTime = currentTime;
  }
 }*/