const int ledPin = 7;
const int buttonPin = 2;

int buttonState = 0;
int lastButtonState = 0;

bool ledOnOff = false;


void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
  buttonPress();
}

void buttonPress() {
  buttonState = digitalRead(buttonPin);

  if ((buttonState == HIGH) && (lastButtonState == LOW)) {
    ledOnOff = !ledOnOff;

    digitalWrite(ledPin, ledOnOff ? LOW: HIGH);
  }

  lastButtonState = buttonState;

  delay(10);
}