How To Play MP3 Files on Arduino from SD Card

So let’s prepare the following materials:
1. Arduino Uno (or any microcontroller you are comfortable with).
2. SD card loaded with mp3 file.
3. A speaker (optional audio amplifier).
4. 3 pieces tactile switch for player control.
5. Breadboard.
6. Some jumper wires.
7. Source code provided below.

So let us begin by:

2. Connect the speaker to Arduino Uno as follows:
* Speaker (+) pin to Arduino Uno pin 9.
* Speaker (-) pin to Arduino Uno GND pin.
3. Connect the Arduino Uno to a computer.

4. Upload the following sketch. After successfully uploading the sketch to our microcontroller, it should function as follows:
* Pressing the first button should play the previous mp3 file.
* Pressing the middle button should play / pause the currently playing mp3 file.
* Pressing the third button should play the next mp3 file.
* Long pressing the first button should decrease the volume.
* Long pressing the third button should increase the volume.
5. Lastly, feel free to modify the source code for learning and fun.

Video Demonstration:

#include "SD.h"
#include "TMRpcm.h"
#include "SPI.h"


#define SD_ChipSelectPin 10
#define spkrPin 9


TMRpcm tmrpcm;

void setup() {
  
  tmrpcm.speakerPin = spkrPin;

  SD.begin(SD_ChipSelectPin);

  tmrpcm.setVolume(6);
  tmrpcm.play("CannotBe.wav");
  delay(3000);

}

void loop() {
  
  tmrpcm.play("AyeSir.wav");
  delay(3000);  
  
}