Picture of Playing Wave file using arduino
This is a simple circuit to play wav files using arduino Nano V3.0 ,it consist from 4 buttons ,each one play specific wav file loaded to SD card.
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Step 1: Parts

Picture of Parts
Funduino Nano V3.JPG
Funduino Nano V3 1.JPG
1- Arduino Nano V3.0 (I used the chines version called Funduino Nano).
2- SD card Module.
3- SD card.
4- Bread Board.
5- four push Button .
6- four 22K resistors.
7- one 4.7K resistor.
8- BC546B NPN transistor.
9- Speaker.
10- wires.

Step 2: Prepare your SD card

Picture of Prepare your SD card
Wav Sample Converter.png
1- Format SD card and make sure the setting as attached picture.
2- Convert your music to .WAV files and make sure the below:
-Samples Per second(Hz):16000
-Channel :Mono
- Bits Per Sample: 8
I use Wav Sample rate converter software (picture attached).
3- Wave files samples attached.

Step 3: Circuit Digram

Picture of Circuit Digram

Step 4: Source Code

Picture of Source Code
1-Before writing the code you need to install TMRpcm library from below link:
all information how to install and use the library included in the website .

2- Download the attached file and open it with arduino sketch ,I tried to copy and paste the Source Code from arduino sketch to instructable but for some reason the text convert to rubbish.

WavSW_ino.zip887 bytes
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can this project play voices


can i use another transistor aside from the BC546B NPN???

thank you

SteveK82 days ago

Hi Husham,

Thanks for sharing your great work!

I'm having a problem with initializing the sd card using 'SD.begin()'. I've formatted the card with FAT32 AND all the connections seems to be ok to me.

What could be the problem? Can you shed a light please?

voltman10 days ago

I can't compile the sketch I get

TMRpcm.h: No such file or directory, yet the library is there.

Husham Samir (author)  voltman7 days ago

this error telling you that you didn't install theTMRpcm library in the right location.

i also got a compile error:

TMRpcm.h: was not declared in this scope

But i have installed the library

AdieV13 days ago

Excuse me sir, i want to ask you about
how much voltage in your input ?
what is the spesificaton of your speaker?
i want to make a project same as yours..:D

Husham Samir (author)  AdieV7 days ago

5 Volt

oke thankyou sir
how can i check my push button works or not with my arduino program?
can you help me..

RameshK520 days ago
I did this project using an Arduino Uno and 8 Ohm speaker without the transistor and the sound volume was fair.

Thanks For Sharing It

what is the parts of project using Arduino Uno??
and what is the Connection method??

mfreire41 month ago

I did the same as his scheme . But the speaker sound is very low.

I used the speaker 0,25W 8ohm and the sound remains low.

How do I put the loudest sound?

Husham Samir (author)  mfreire423 days ago


first of all ,make sure that you connect the transistor correctly.

if yes ,then try to amplify the wav file using the software.

PenguinM25 days ago

Hi, first off great instructions. I am working with the same library and your converted files were very helpful. For some reason, the files you have converted work perfectly, but when I try to convert my own, which include vocals, I get jsut static. I have used Audacity to convert them, and converted your files using the same method, but only yours seem to work. Do you have any advice on how I can get my files converted properly?

Husham Samir (author)  PenguinM23 days ago

Hi,maybe the software you used not convert it probably , try to use the same software I used (WAV sample converter) and set it as below

Samples Per second(Hz):16000

Channel :Mono
Bits PerSample: 8

I hope it will work.

Meka281 month ago

Dear, this is a nice piece of work!

Though, I tried to apply it on a BareConductive Touch Board, but couldn't successfully upload the WavSW_ino file: "Error Compiling" message.

Any idea if this could work on such board please?

BasS21 month ago

This is almost perfect for what i want to create:)

I want a slight modification: because I can only use two wires for the 5 buttons I have to create a switchboard like this (my electronics skills are the worst :( ).

Is it possible to digitize this output so the Arduino knows what key(s) are pressed? Do you have an example of how i could try and make this work...

You could use an I2C bus exapander like a PCF8574. Take a look at this tutorial:

Very helpfull, thanks!

I'm currently looking into this with R-2R ladder setup:

Yes, the R ladder setup is an easier solution I guess.

tonini461 month ago

Does this library work with the Intel Galileo Boards Gen 1 and 2?

goldenshuttle2 months ago

Hi Husham. Great project, I was doing a speaking distance meter, using WTV020 which is also SD based sound file player. But WTV020 has so many issues and decided to dump it. I probably prefer to go for SD direct, can it speak different distance say usig If-else statement ? did you try it ?

Hey goldenshuttle, I also want to make same project which you mentioned. You said that there are some problem about WTV020. What kind of problem did you mention? ( I searched a lot, but everyone who used WTV020 is ok )

nvilocity1 month ago
Great project!! Good discription and explanation. Your awsome... Thanks
A.Ward885 months ago
Could one use piezoelectric sensors to play the sound file?

I guess you meant that you could use a piezo instead of a coil spealer.

So, did you get it to work? Does it sounds good?

Yep, I have the same idea, arduino codes are essentially if this happens, then do this. You can trigger them with distance, alcohol sensors, temperature, light, literally anything.
kpdavis5 months ago

We got this going without much trouble at all. Now we are trying to run the audio to a set of PC desktop speakers via a 3.5mm audio plug. We get a lot of hum. I see that one suggestion is adding a capacitor, so we will try that. But also saw the suggestion of just taking the transistor out. We can give that a try also. Just not sure what should be coming out of one of those 3.5mm audio plugs. It must be somewhat standard. If there are other suggestions, let me know.

Husham Samir (author)  kpdavis3 months ago


I believe the best solution to remove noise issue by using ceramic capacitor (code 104) .

We took the transistor out and ran the audio from the arduino to the powered speakers. We also improved the grounding. that make it much better.

thanks for the reply.

djdeeno4 months ago


What a great sampler is this, i gonna make also a sampler.

I have a little question about this one, is it poisable to make it for stereo line out? so without a speaker but left right line output? please let me know.

Ps is there a arduino topic on the forum there?

Kind regard from Amsterdam


Husham Samir (author)  djdeeno3 months ago


if you check the headphone jack ,The tip is the left channel,the ring is the right channel, and the sleeve is ground ,so if you short left and right channel ,you will get sound in both speaker but in mono mode.

if you need better quality and stereo mode ,below link might help you.

safayeta5 months ago

I am using BC547 transistor and 8 ohm 0.5 watt speaker
The sound is vary low
in your video the sound is quite high
how can i increase the sound.. Thanks

Husham Samir (author)  safayeta3 months ago

Hi ,

Try to find a software to increase the volume of the sound file ,then test t again in the circuit

varuna14 months ago

hi can the output of a ping sensor be made into a voice output

Hi I'm very interested in this project but when i have installed the library all examples haven't been correct for the ide because it told me that i havent installed the library but i have done it

RowanD14 months ago

Hello! This instructable is awesome, and I appreciate your writing it. I am, however, having major issues getting my audio files to play. I have gotten the whole set up working using the sample files, but I cannot get mine to play.

I have converted the files to 8bit 16 kHz mono wav files, and have tried multiple attempts with naming conventions with no luck. The files play fine on my computer (degraded in quality somewhat due to the 8bit 16 kHz factor, but certainly more recognizable the fuzz I'm getting out of the speaker in my set up).

Thanks for any help anyone could give me in this. I have multiple DAWs and am capable of manipulating the audio files however is necessary, but I'm at a loss of what to try.

ko.ten.76 months ago

i want to use with atmega8.

please help me!!!!!!!!!

alexr10 ko.ten.75 months ago

perhaps it is cause atmega328 has 4x flash memory of the atmega8, see how big the hex executable is. you may need a chip with more memory

KUPOV5 months ago

Hi, very nice and useful instructable, but my do not work at all. I use 0,2 W 8 ohm speaker. My code work properly. I thought that it is something with sd card, but when I wrote code for saving data it worked. Do you have any idea what may be cause of problem?

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