Adding music or sounds will always make our project look a lot cooler and more appealing. The best way to add sound effects to your project is by investing in an extra SD card module and a normal speaker, especially if you are using an Arduino and you have lots of open pins. Using your Arduino Board, I have created a simple Music Player/Sound Maker. Thank you to the Arduino community for developing some libraries for you to build this quickly and easily. The IC LM386 was also used here to increase the volume and cancel out the noise.

Arduino UNO SD Card Reader module SD card LM386 Audio Amplifier 10uf Capacitor (2 Nos) 100uf Capacitor (2 Nos) 1K, 10K Resistor Push buttons (2 Nos)

Breadboard Connecting Wires

The goal of this project is to play the .wav music files stored on the SD card. Through the LM386 Audio amplifier, we will play these .wav files on a speaker using an Arduino programmed to read them. This project cannot technically be called an Arduino Mp3 Player since this code can only read .wav files, but you still get to hear the music. Alternatively, consider an Arduino music player without SD card if you are looking for a simple alternative

Audio files in .wav format are necessary for playing sounds from SD cards using Arduino. Due to the inherent limitations of the Arduino Board, only wav format audio can be played. An Arduino mp3 player can be made using

many different mp3 shields which are available for Arduino. Alternatively, many websites provide instruments for the conversion of audio files into WAV files on your computer. Following the steps below will help you convert any audio file to wav

Step 1: Go to “ https://audio.online-convert.com/convert-to-wav ” website. Step 2: The following format is supported by Arduino. You can experiment with different settings later, however, the following settings were experimentally the best in quality. Bit Resolution8 Bit Sampling Rate 16000 Hz Audio ChannelMono PCM format PCM unsigned 8-bit

In the website, check the "choose file" box and select the file you will be converting. Then feed the settings into the field. Once done, your conversion should look like the image below.

Step 4: Afterwards, click on “Convert File” and your Audio will be converted into .WAV format. Once the conversion is completed, the .WAV file will be downloaded.

Once you've formatted your SD card, save the audio .wav file onto it. Before adding this file, make sure it is formatted correctly. Keep in mind the name of your audio file as well. You can do the same with your four audio files, selecting any one of them and saving them as 1, 2, 3, and 4. As shown

below, I have converted four songs created by a particular digital music converter to wav, mp3, mp4, and mp3 audio formats. We interface the Arduino with a SD card reader module since we haven't been able to interface our Arduino directly with some of our audio files. With the SD card and Arduino, communication is accomplished using SPI. Thus, the Module is connected to the Arduino's SPI pins as shown above in the diagram. The following table provides further details. ArduinoSD card module +5V Vcc Gnd Gnd Pin 12 MISO (Master in Slave out) Pin 11 MOSI (Master Out Slave In) Pin 13 SCK (Synchronous Clock)

Pin 4 CS (Chip Select) After the SD card is read, the Arduino will be capable of playing the music on pin number 9. On pin 9, the audio signals generated by the Arduino are not loud enough to be audible much. Therefore, LM386 Low voltage Audio amplifier IC is used to amplify it. Amplifiers like the one shown above have Gains as high as 200 and the 5V pin of the Arduino is powering the Vdd pin. If you want to adjust the volume, the voltage applied to this pin can be increased/decreased. There are 200 watts of gain amplification in this device, which is ideal for use in low power circuits for LM386. Additional buttons are also connected to pins 2 and 3 on the Arduino. The switches can play/pause the music and play/skip the next track of a song respectively. The buttons below were used only to demonstrate the song's capabilities; you can play the song whenever desired.