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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?

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Drinfinity [205 posts] 1 month ago
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I had a look at something similar for our GoRide club. In the end we went with commercial ant+ sensors and a laptop with dongle, but whilst that was OK it didn’t really do what I wanted.  The available free software was a bit poor. Your approach sounds better.

You can basically just plug the Hall effect sensor directly to a pin on the Arduino. 

http://www.electronics-lab.com/project/using-hall-effect-sensor-arduino/