My project represents an MP3 player with a display that shows the current song playing.

The project can read the MP3 files in the SD card, and can pause and play the same as the device 10 years ago. And also it has previous song and next song function.

My aim is to make something simple and efficient while also including and adapting it to current standards.

My project uses an Arduino Uno board as its base connected to an oled display showing the current song playing, 3 buttons to use for its functions, an internal speaker and an sd card reader for reading the .mp3 files off of it.

List of Parts:

• Arduino Uno

• Mini MP3 player

• Speaker

• 1.3 inch oled display

• 3 100Ω resistors
• 3 Switch Buttons
• Jumper wires
• Breadboard
• 1k Resistor

This code is written for an Arduino board to control an MP3 module and display song information on an LCD screen. Here's a breakdown of the code:

• Libraries:
  • LiquidCrystal.h: This library allows communication with LCD displays.
  • SoftwareSerial.h: This library enables serial communication with the MP3 module.

• Constants:
  • Start_Byte, Version_Byte, Command_Length, End_Byte, and Acknowledge: These are predefined values used for communication with the MP3 module.

• Variables:
  • buttonNext, buttonPause, buttonPrevious: These variables store the pin numbers for the buttons used to control the MP3 module.
  • isPlaying: This boolean variable keeps track of the current playback state.
  • rs, en, d4, d5, d6, d7: These variables store the pin numbers for the LCD display.
  • lcd: This object represents the LCD display.
  • mySerial: This object represents the SoftwareSerial communication with the MP3 module.

• setup() function:
  • Initializes the LCD display with the specified dimensions.
  • Begins serial communication with the MP3 module.
  • Sets up the button pins as inputs with pull-up resistors.
  • Delays for 1 second to allow initialization.
  • Calls playFirst() to play the first track and sets isPlaying to true.

• loop() function:
  • Checks the state of the buttons and performs corresponding actions:
    • If the pause button is pressed, it toggles the playback state between play and pause.
    • If the next button is pressed, it plays the next track.
    • If the previous button is pressed, it plays the previous track.
  • Calls getSongDuration() to retrieve and display song duration information.

• Playback functions:
  • playFirst(): Sends commands to initialize the MP3 module and start playback of the first track.
  • pause(): Sends a pause command to the MP3 module.
  • play(): Sends a play command to the MP3 module.
  • playNext(): Sends a command to play the next track.
  • playPrevious(): Sends a command to play the previous track.
  • setVolume(): Sends a command to set the volume level.

• execute_CMD() function:
  • Calculates the checksum and builds the command line to send to the MP3 module.

• getSongDuration() function:
  • Sends a command to the MP3 module to retrieve the current track's duration.
  • Reads the response from the MP3 module and extracts the duration and remaining duration information.
  • Updates the LCD display with the song duration and remaining duration.

 1. Initialization:
     * The LCD display will initialize and show "Duration:" on the first line and "Remaining:" on the second line.
     * Serial communication will be established with the MP3 module.
     * The button pins will be configured as inputs with pull-up resistors.

 2. Playback Control:
     * If you press the pause button (buttonPause), it will toggle the playback state between play and pause. The LCD display will not update with the song duration or remaining duration.
     * If you press the next button (buttonNext) while playing a track, it will play the next track. The LCD display will not update with the song duration or remaining duration.
     * If you press the previous button (buttonPrevious) while playing a track, it will play the previous track. The LCD display will not update with the song duration or remaining duration.

 3. Song Duration Display:
     * The getSongDuration() function is called in the loop() function, but it is currently commented out (//getSongDuration();). Therefore, the song duration and remaining duration will not be displayed on the LCD screen.

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