This board provides 12-bit sampling and playback of audio and comes with an example sketch for a digital ring modulator voice changer effect (think Daleks and Cybermen, and many other robotic voices). Many other voice effects can be achieved with this board and more example sketches will be available soon.
You now have the choice of buying the PCB alone for $9.99 or buying a fully assembled version that even includes the required electret mic for an additional $19.99.
In addition to this board, you will also need the following:
I wanted a board that offloaded the ADC/DAC work to external chips so that the Arduino was capable of more processing, allowing for real-time adjustments to the sound manipulation logic i.e. adding pots to control pitch and frequency. The board also has a connector for external LEDs, which is very useful when you need to trigger lights along with the sound effect. This is very useful for cosplay or Halloween costumes!
As far as I know this is the only board currently available targeted specifically at making voice changers with corresponding light effects.
You can 3D print a case to hold the Arduino and voice changer shield using designs available on Thingiverse at https://www.thingiverse.com/thing:1615697/#made
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I'm a professional software developer but enjoy tinkering with Arduoinos, Raspberry Pis, electronics and 3D printing in my spare time.
I've invented a couple handy boards so far, which I sell here to help cover some of the costs of my hobby.