/*
  State change detection (edge detection)

  Often, you don't need to know the state of a digital input all the time, but
  you just need to know when the input changes from one state to another.
  For example, you want to know when a button goes from OFF to ON. This is called
  state change detection, or edge detection.

  This example shows how to detect when a button or button changes from off to on
  and on to off.

  The circuit:
  - pushbutton attached to pin 2 from +5V
  - 10 kilohm resistor attached to pin 2 from ground
  - LED attached from pin 13 to ground through 220 ohm resistor (or use the
    built-in LED on most Arduino boards)

  created  27 Sep 2005
  modified 30 Aug 2011
  by Tom Igoe

  This example code is in the public domain.

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/StateChangeDetection
*/

// this constant won't change:
const int  buttonPin = 7; 
const int  buttonPin1 = 8;     // the pin that the pushbutton is attached to
const int ledPin = 13;       // the pin that the LED is attached to

// Variables will change:
int buttonPushCounter = 0;   // counter for the number of button presses
int buttonState = 0;         // current state of the button
int lastButtonState = 0;
int buttonPushCounter1 = 0;   // counter for the number of button presses
int buttonState1 = 0;         // current state of the button
int lastButtonState1 = 0;       // previous state of the button

void setup() {
  // initialize the button pin as a input:
  pinMode(buttonPin, INPUT);
   pinMode(buttonPin1, INPUT);
  // initialize the LED as an output:
  pinMode(ledPin, OUTPUT);
  // initialize serial communication:
  Serial.begin(9600);
}


void loop() {

  buttonState = digitalRead(buttonPin);
    buttonState1 = digitalRead(buttonPin1);

  
  if (buttonState != lastButtonState) {
  
    if (buttonState == HIGH) {
    
      buttonPushCounter++;
      Serial.println(buttonPushCounter);
    } else {
     
   
    }

    delay(50);
  }
 
  lastButtonState = buttonState;

  
  if (buttonState1 != lastButtonState1) {
  
    if (buttonState1 == HIGH) {
    
      buttonPushCounter--;
      Serial.println(buttonPushCounter);
    } else {
     
   
    }

    delay(50);
  }
 
  lastButtonState1 = buttonState1;

 

}