int pbuttonPin = 2; //connect output to push button
int relayPin = 10; //connected to relay (LED)

int val = 0; //push value from pin 2
int lightON = 0; //light status
int pushed = 0; //push status

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(pbuttonPin, INPUT_PULLUP);
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
  val = digitalRead(pbuttonPin); //read the push button value

  if(val == HIGH && lightON == LOW){
    pushed = 1-pushed;
    delay(100);
  }
  Serial.println(pushed);

  lightON = val;
  if (pushed == HIGH){
    Serial.println("Light OFF");
    digitalWrite(relayPin, LOW);
  }
  else{
    Serial.println("Light ON");
    digitalWrite(relayPin, HIGH);
  }
  delay(100);
}