On this Instructables, I will show you how I made a very rudimentary mp3 player. In short, there are melodies stored in the memory that will play based on which buttons are pressed.

Step 1: The Components

Resistors

1x 220 ohms

1x 560 ohms

1x 4.7k ohms

1x 1k ohms

1x 10k ohms

1x 1M ohms

1x LED

4x Pushbuttons

1x Piezo

Step 2: Setup

The placement of the buttons and resistors feed into an analog input, and it's called resistor ladder.

The first button is connected with just wire, the 2nd with a 220 ohm resistor, the 3rd with a 10K ohm resistor, and the 4th with a 1M ohm resistor.

At the end, the circuit should be completed with a 1K ohm resistor. Meanwhile, another wire should connect to analog in A0 to read the resistance.

In the center, a wire from digital pin 8 must be connected to the buzzer and the resistor. The output from pin 8 is the tune the buzzer will play and when the LED will turn on or off.

Lastly, the buzzer should be completed with a 4.7k ohm to lower the volume as well as make the sound more clear.

Step 3: The Code

For the code, it has two parts to it. The coding for the songs, and the coding for which song to play when a button is pressed.

The songs are and coded by:

Star Wars Imperial March

by eserra / www.instructables.com/id/How-to-Easily-Play-Music-With-Buzzer-on-Arduino-Th/

Harry Potter Theme Song

by Borderliner / www.instructables.com/id/Arduino-Harry-Potter-Theme-Song

Tetris

By electricmango / https://electricmango.github.io

I've made slight modification with the codes to make them work with my board.

MP3_player.ino
Download

Step 4: Improvements

There are many things I could improve in the future. These include, adding a potentiometer between the connection of pin 8 to the buzzer. With the potentiometer, I will be able to control the volume of the buzzer. Also, I should compress the notes into either separate libraries or all into one. Adding something like a 555 timer and connect several LEDS would make it flashier. Lastly, I could add an SCR and a button that stops any song midway when pressed.

Anyways, thanks for reading my Instructable.