Ars Technica: Adafruit’s Cheekmate gets to the bottom (ahem) of chess cheating controversy

Ars Technica: Adafruit’s Cheekmate gets to the bottom (ahem) of chess cheating controversy. “Figuring out how to communicate with a player mid-match was tricky since any kind of visible LED or audible speakers would be far too obvious. The Adafruit team opted to use a tiny vibration motor similar to those used in cell phones, along with a small driver board to supply a bit more current. And because the receiving device must be concealed on (or in) a sweaty human body, it needed to be encased in something sufficiently moisture-proof to protect the electronics.”

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