A maker built an autonomous coin-flipping machine for a rare €1,000 commemorative Monaco coin. The device uses a 12V solenoid to launch the coin, a 3D-printed tray to catch it, and a computer vision system powered by a TFLite model and OpenCV on a raspberry Pi to classify heads or tails. A servo-driven iris mechanism recenters the coin for the next flip. The build ran reliably for 50,000 flips on a public livestream.
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