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Submission + - Self-built gyroscope messenger as Christmas gift (

Csiko writes: The ingredients in this do-it-yourself christmas project are a gyroscope built of a felt pen, a bunch of old CDs, an embedded microcontroller (MCU), some LEDs and a big portion of nerdism. While the gyroscope spins, the MCU controls the LEDs so that a writing appears in realtime. Nice project, but it definitely needs a nerd girlfried to appreciate that.
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Self-built gyroscope messenger as Christmas gift

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Numeric stability is probably not all that important when you're guessing.