const int BUTTON_PIN = 7; // Arduino pin connected to button's pin
const int LED_PIN    = 2; // Arduino pin connected to LED's pin

// variables will change:
boolean ledState = false;     // the current state of LED
boolean lastButtonState = false;    // the previous state of button
boolean currentButtonState = false; // the current state of button

void setup() {
  Serial.begin(9600);                // initialize serial
  pinMode(BUTTON_PIN, INPUT_PULLUP); // set arduino pin to input pull-up mode
  pinMode(LED_PIN, OUTPUT);          // set arduino pin to output mode


}

void loop() {
  lastButtonState    = currentButtonState;      // save the last state
  currentButtonState = digitalRead(BUTTON_PIN); // read new state

  if(lastButtonState == HIGH && currentButtonState == LOW) {
    Serial.println("The button is pressed");

    // toggle state of LED
    ledState = !ledState;

    // control LED arccoding to the toggled state
    if (ledState == true){
    digitalWrite(LED_PIN, HIGH); 

    }
    if (ledState == false){
          digitalWrite(LED_PIN, LOW); 
    }  
    
    delay(500);
  }



}