Music can be very confort. I want to know how to drive the sound output by Arduino, DFPlayer Mini and NFC, then bring rhythm to living place.

Process and reflection: 

[Your text goes here; at least 150 words. Address what your process was, e.g. what did you make/do first; how did it go; what did you make/do next; etc.

Include a reflection at a minimum addressing what you learned, any surprises along the way, and how you feel about where you ended up.]

/*

    60-223 Intro to Physical Computing, fall 2025

    Domain-specific Skill Building exercise: [Insert name of your project here]

    [Write a short description of what this sketch does. What hardware does

    it connect to? What is its function? Imagine you're describing it to someone

    over the telephone.]

    Pin mapping:

    Arduino pin | role  | details

    ------------------------------

    5             input   momentary button

    8             output  external LED

    Released to the public domain by the author, January 2024

    Robert Zacharias, rzachari@andrew.cmu.edu

*/

const int BUTTON_PIN = 5;

const int LED_PIN = 8;

void setup() {

  pinMode(BUTTON_PIN, INPUT);

  pinMode(LED_PIN, OUTPUT);

  Serial.begin(9600);

}

void loop() {

  int buttonState = 0;

  buttonState = digitalRead(BUTTON_PIN);

  int ledBrightness = 0;

  if (buttonState == HIGH) { // if the button was pressed

    ledBrightness = 200;     // bright

  }

  else if (buttonState == LOW) { // otherwise, if the button wasn't pressed

    ledBrightness = 30;    // dim

  }

  analogWrite(LED_PIN, ledBrightness);

  Serial.print("buttonState = "); // just write that text to the screen

  Serial.print(buttonState); // then send the value of the variable

  Serial.print(", ledBrightness = "); // write that text to the screen

  Serial.println(ledBrightness); // send the value of the variable

  delay(10);

}