Make a Switch Counter using Arduino

Instruction:

1. A push-button is connected to pin number 2. 
2. Write a program that will count the number of time the button is pressed. Whenever a button is pressed the program will send the count including the latest one. That is the program will send the count if and only if button is pressed.

Design:

Code:

/*
Name: Switch Counter
*/
int pin_2 = 2;  //button pin              
int buttonState; //button state
int val;                        
int cnt = 0;  //button press counter        

void setup() {
  pinMode(pin_2, INPUT);  //setup button pin as input   
  Serial.begin(9600); //initialize serial          
  buttonState = digitalRead(pin_2);   //read the button state
}


void loop(){
  val = digitalRead(pin_2);      //read the button state
  if (val != buttonState) {          
    if (val == HIGH) {                
      cnt++; //increment button counter              
      Serial.println(cnt); //print the value of button press counter
    }
  }
  buttonState = val;                 
}