Picture of How to use WTV020SD-16P with Arduino
WTV020SD-16P is an excellent module for adding music on to electronic projects. The module can be used with/without Arduino.

There are several things to be considered while working with this module. For example, it works with only 2GB microSD card and it supports only AD4 format music file.

Check this tutorial to know about AD4 file format and other important issues of this module.

I found that the module works in two different ways:
a. MP3 mode (Without Arduino): In this mode, AD4 format music files are played by basic connection. This is the simplest mode.
The following experiment photo depicts the MP3 mode of wtv020SD-16P.

WTV020SD Music Module with Audio amplifier

You can also check the following tutorials.
a. Mp3 mode circuit-basic.
b. Mp3 mode circuit with LM386 based audio amplifier


b. With Arduino: This music module also works with Arduino giving more flexibility in control over your music files.
Watch the video:

You can get details of the above experiment on the following pages:
a. Experiment 1- Arduino and WTV020SD-16P
b. Experiment 2
c. Library
shane7421 month ago

hi guys, im new to this and this has helped me a great deal but i cant get my wtv020 to work now. when i push the button, it makes a slight sound and then goes off. am i doing something wrong. can it be lack of power or wrong files, no idea

it makes a beep sound and goes off. please bear in mind that it was working but decided to stop

PierreM16 months ago


I tried this tutorial but no sound are played in the B mode (with arduino) (two line serial mode).
I've used the arduino code and library indicate in this page (the program run and the serial console indicate the sound should be played) but no sound.
I think the wtv020sd-16p module stay in mp3 mode and don't want run in two line serial mode.

The A mode work properly on my wtv020sd-16p module (without arduino) (MP3 Mode). But not the B mode of this tutorial...
I've verified all the wire...

Some idea of the issue of this problem ?

bobbokop1 year ago
Tried with 1Gb and worked properly.
What actually made me waste some time was the naming convention of the file. I had to check the specs to find out that the ad4 files should be named 0000.ad4, 0001.ad4 and so on...

mattotone1 year ago
Id like to add the importance of the SD card.
I ordered a Sandisk 2gb from amazon market, It did not turn up in retail packaging but was recognised by the PC.
Loaded the sample files and used the module without the arduino for simplicity. It did not work and believed the SD card to be FAKE!
Ordered another sandisk 2g card from a highstreet retailer in packaging, exact same setup and it now works properly.

IN summery make sure the card you order is Genuine theres lots of sandDisk fakes around.

Mp3 mode wiring diagram. Only need pins 4 5 8 16 13 for basic test.
music will play as soon as button on pin 13 is pressed.