/*
  Button

  Turns on and off a light emitting diode(LED) connected to digital pin 13,
  when pressing a pushbutton attached to pin 2.

  The circuit:
  - LED attached from pin 13 to ground through 220 ohm resistor
  - pushbutton attached to pin 2 from +5V
  - 10K resistor attached to pin 2 from ground

  - Note: on most Arduinos there is already an LED on the board
    attached to pin 13.

  created 2005
  by DojoDave <http://www.0j0.org>
  modified 30 Aug 2011
  by Tom Igoe

  This example code is in the public domain.

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

// constants won't change. They're used here to set pin numbers:
const int buttonPin = 2;  // the number of the pushbutton pin
const int ledPin = 13;    // the number of the LED pin green
const int ledPin2 = 11;    // the number of the LED pin red
// variables will change:
int buttonState = 0;  // variable for reading the pushbutton status

void setup() {
  pinMode(ledPin, OUTPUT);    // initialize the LED pin as an output:
  pinMode(ledPin2, OUTPUT);    // initialize the LED pin as an output:
  pinMode(buttonPin, INPUT);  // initialize the pushbutton pin as an input:
  Serial.begin(9600);         // initialize the serial moniter
}

void loop() {
  buttonState = digitalRead(buttonPin);   // read the state of the pushbutton value:
  
  // checks if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (buttonState == HIGH) {
    digitalWrite(ledPin, HIGH); // turn green led on
    digitalWrite(ledPin2, LOW); // turn red led off
    Serial.println("Button pressed = Green light"); // write the sentence in the serial moniter
  } else {
    digitalWrite(ledPin, LOW); // turn green led off
    digitalWrite(ledPin2, HIGH); // turn red led on
    Serial.println("Button not pressed = Red light"); // write the sentence in the serial moniter
  }
}