Well, this is by far one of the coolest things I've seen on the internet this week. YouTuber 'Sufficiently Advanced' has created a pair of real life Harry Potter dueling wands. They're powered by a Raspberry Pi to handle speech recognition, and an Arduino which connects to the Pi and controls two TENS (Transcutaneous Electrical Nerve Stimulation) units. These send high voltage, low current electrical shocks to electrode pads which stick to your skin. They're quite safe and fairly harmless, although on the highest setting they can deliver quite a jolt.
Simply put, you speak the name of the spell you wish to use, and the NeoPixel equipped wand emits a pulse of Infrared light which, if directed at another unit's infrared receiver, will be received by the Arduino and perform a shock based on the spell that was used.
It made me smile the whole way through, and is a fantastic use of imagination, creativity, and technology.
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