Practicing prestidig...prestidigiti...illusions requires one to take another in to one's confidence...or...
The assistant makes use of an optic to discretion between light and dark then store and reference the variance for a pass-fail search. The mechanical function is operated by an Arduino Uno and communicated by our resident artificial automation Jacob.
Written, Directed and Jazz Hands by TVMiller
Guest Starring Jacob
Filmed with Hypnosis and Droid Razr
Seeing as it was noted in a comment, the card coincidentally at the bottom is NOT the card Jacob chose if you look closely. I am no hack...see what I did there?!
HackADay.io - Magician's Assistant
Hackster.io - Magician's Assistant
Adafruit - Make A Magicianís Assistant With Arduino
An experiment with foreign objects; key chain edition.
Written, Directed and Nemesised by TVMiller
Filmed on Papyrus and Droid Razr