Jingle Bells with a Buzzer and Arduino

Christmas is coming and everyone is about to put wonderful colored trees in their houses. This year we bought a new tree but we didn't change all the decorating parts like balls and lights. We also had a little red and white box shaped like Santa Claus' head that used to play Christmas jingles with some sort of a buzzer (so monotone sounds were produced). But the problem is that it broke down since it was probably too old.
Since I had an Arduino UNO at hand, I built a similar thing with it.
Here you can find the Github repo for the code.

Parts

1. Arduino Uno (or whatever version you might already have)
2. A buzzer
3. A 220Ω resistor (but you don't need it if you want to destroy your buzzer!)
4. A case, wires, and a little breadboard

Wiring

Let's get dirty

I started developing it with the buzzer and the resistor on the breadboard. (as you can see from the photo I thought to use a potentiometer to adjust the volume, but the one that I have is 50K and it's just. too much for the buzzer)

I took a case and I made two holes on it (one for the wirings and another for the 5v power supply) and I put the Arduino inside it and the breadboard outside.
On Github's readme, you can find two other ideas I left there if you're keen to improve this project.

The code

This isn't the first time that I make something like this. The first time I've used a buzzer, I've translated the imperial march of Star Wars notes to frequencies in an Arduino sketch, calculating manually the pauses and adding them line by line. I lost that piece of code and now I coded this song in a cleaner way using cycles and arrays. Take a look:

int buzzerPin = 8;
int tempo = 200;
char notes[] = "eeeeeeegcde fffffeeeeddedg";
int duration[] = {1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2};

void playTheShit(char note, int duration) {
  char notesName[] = { 'c', 'd', 'e', 'f', 'g' };
  int tones[] = { 261, 293, 329, 349, 392 };

  for (int i = 0; i < sizeof(tones); i++) {
    // Bind the note took from the char array to the array notesName
    if (note == notesName[i]) {
      // Bind the notesName to tones
      tone(buzzerPin, tones[i], duration);
    }
  }
}

void setup() {
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  // Scan each char from "notes"
  for (int i = 0; i < sizeof(notes)-1; i++) {
    if (notes[i] == ' ') {
      // If find a space it rests
      delay(duration[i] * tempo);
    } else {
      playTheShit(notes[i], duration[i] * tempo);
    }

    // Pauses between notes
    delay((tempo*2)*duration[i]);
  }
}

And that is all

I hope that if you did or will do something along the lines of this little thing, you'll link it to me through social networks, but most importantly I wish you a Merry Christmas!

Enjoy 🎅🎄