#include <Bounce2.h>
#define BUTTON1_PIN 2
#define BUTTON2_PIN 3 
#define BUTTON3_PIN 4
#define BUTTON4_PIN 5 

Bounce2::Button button1 = Bounce2::Button();
Bounce2::Button button2 = Bounce2::Button();
Bounce2::Button button3 = Bounce2::Button();
Bounce2::Button button4 = Bounce2::Button();

  int out1State = LOW;
  int out2State = LOW;
  int out3State = LOW;
  int out4State = LOW;


void setup() {
Serial.begin(115200);

  button1.attach( BUTTON1_PIN, INPUT_PULLUP ); // USE EXTERNAL PULL-UP
  button2.attach( BUTTON2_PIN, INPUT_PULLUP );
  button3.attach( BUTTON3_PIN, INPUT_PULLUP ); 
  button4.attach( BUTTON4_PIN, INPUT_PULLUP );

  button1.interval(5); 
  button2.interval(5);
  button3.interval(5); 
  button4.interval(5);
  button1.setPressedState(LOW); 
  button2.setPressedState(LOW);
  button3.setPressedState(LOW); 
  button4.setPressedState(LOW);

}

void loop() {
    button1.update();
    button2.update();
    button3.update();
    button4.update();

  if ( button1.pressed() ) {
       out1State = !out1State; // SET outState TO THE OPPOSITE OF outState
       //digitalWrite(LED_PIN,outState); // WRITE THE NEW outState
      }
  if ( button2.pressed() ) {
       out2State = !out2State; // SET outState TO THE OPPOSITE OF outState
             }
  if ( button3.pressed() ) {
       out3State = !out3State; // SET outState TO THE OPPOSITE OF outState
       //digitalWrite(LED_PIN,outState); // WRITE THE NEW outState
      }
  if ( button4.pressed() ) {
       out4State = !out4State; // SET outState TO THE OPPOSITE OF outState
             }

	Serial.println(out1State);
	Serial.println(out2State);
  Serial.println(out3State);
	Serial.println(out4State);
  Serial.println("");
}