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Help needed: Roller racing rig goes digital!

Anyone able to help me with a thing? I'm doing up an old roller racing rig and I want to give it a digital timing upgrade. in theory this is pretty straightforward:

  1. magnets on the rollers, hall effect sensors counting revolutions
  2. Arduino doing the counting and timing
  3. LED displays showing the times

There's a few other bits and bobs i'll probably add too, like a simple sound board. anyway, fixing up the rig i'm fine with and i can program an Arduino okay, but designing and building the circuit isn't my particular sphere of expertise. anyone out there interested in helping out?

If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.

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