Tips & Tricks: MP3 Player

A media player, sampler, and looper in one module


The mp3 player module allows you to play your very own mp3 files using littleBits. Sending a signal to the mp3 player can make it work as a media player, sampler, or looper. Watch the following video to learn about all the features.

Loading mp3 Files Onto Your Module:

To put a new mp3 on your module you will need to remove the micro SD card from the bottom of the board. To do this, gently press the SD card in, which will cause it to pop out from it’s metal case.



Next, put the micro SD card in the adapter that came with your mp3 module. This card will fit into most card readers or the SD card slot on your computer.

remove_sd_card sd_card_into_adapter

Using your computer, add any mp3 files that you would like to play. To choose the order that files are played in simply rename the mp3 file so that it has a number in front of the file name. The mp3 player will then play your mp3 tracks in numerical order.


Momentary vs. Latching Inputs:

Momentary inputs are quick ON or OFF signals sent into your MP3 player. A great example would be adding a button before your MP3 module. If you briefly press the button, a quick 5 volt signal goes to the MP3 module triggering it to start or stop (depending on the mode you are in). Latching inputs stay ON or OFF for a longer period of time. For example, a toggle switch sends out a 5 volt signal for as long as it is in the ON position. For the MP3 module, any incoming signal that is longer than 3 seconds is considered a latched input, so pressing and holding the button for more than 3 seconds would be the same as leaving a toggle switch on for that same amount of time.

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Finding cool sounds online:

There are tons of places online where you can find cool mp3 sounds to load onto your module. Here are a few site that we’ve enjoyed using:


mp3 + Synth:

Delays, envelopes, and filters can all do very cool things to the signals coming from the mp3 player. Experiment with these modules in between the mp3 player and the speaker.



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