/*
  Button

  Turns on and off a light emitting diode(LED) connected to digital pin D8,
  when pressing a pushbutton attached to pin D9.

  The circuit:
  - LED attached from pin D8 to ground through 1k resistor
  - pushbutton attached to pin D9 from with Built in XIAO RP2040 3V Resistor 
  - Button attached to pin 2 from ground



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

  modified 21 March 2023
  by Juliana Lozano

  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 = D9;  // the number of the pushbutton pin
const int ledPin = D8;    // the number of the LED pin

// variables will change:
int buttonState = 0;  // variable for reading the pushbutton status

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT-PullUp);
}

void loop() {
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (buttonState == HIGH) {
    // turn LED on:
    digitalWrite(ledPin, HIGH);
  } else {
    // turn LED off:
    digitalWrite(ledPin, LOW);
  }
}