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Requires only $600 worth of additional equipment. "With Arduino" is doing some heavy lifting.


Technically still "hobby"-level, I recently acquired the OpenBCI Ultracortex [1] and that's sitting at $3k

[1] https://shop.openbci.com/products/the-complete-headset-eeg


Everything's hobby level if you have deep enough pockets.


Everything's a hobby until you want to start making money with it




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