First off, I would like to say that this is an amazing project and introduction into the world of microcontrollers. What if we could do the same project, but as an intro to signal processing?

I am in the middle of this kit, and something occurs to me. Correct me if I’m wrong, but the brain machine needs only to A. Remember 2 frequencies: one for the left ear and eye, and one for the right ear and eye, and B. Express each of those frequencies as both a sine wave of an appropriate amplitude for headphones, and a square wave of an appropriate amplitude for LEDs.

My proposed idea is to satisfy A. and the first part of B. in a very simple way: simply create and play the frequencies through an MP3 player that supports stereo output, such as an iPod, computer, or $10 no-frills device. This device already outputs the desired frequency audio, and the only trick is to have it output the desired LED signal.

But wait! Aren’t the 2 LEDs going at the same frequency as the 2 audio channels? If that’s the case, can’t we build a circuit that takes the audio signal, converts the sine wave into a square wave with appropriate amplitude, and outputs both the original sine wave (amplified if necessary) and the LED driving square wave?

This device would be easy to program with multiple tracks that could be chosen on the fly, it would be completely platform-independent (Macs would load the same audio files as any other OS users), and it would be a completely different lesson for the same device!

I am in no way an electrical engineer, so I ask those of you in the know if this is actually feasible. I have taken enough courses to believe that it should be, and it could be just as fun as the original! Let me know what you think!
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