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Old 05-06-2004, 02:27 PM   #1
banman
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Default How does a bike odo work?

I'm setting up a car for novice TSD rallying, but I'm experimenting with a custom computer setup. Does anyone know how the signalling works on a bike odo? There are only two wires and two contacts, so is it as simple as a reed switch closing the circuit whenever the magnet passes? So you just get a square-wave signal?
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Old 05-06-2004, 02:41 PM   #2
Bonzo
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methinks that is how it works.

The one thing you need to do is program in the circumfrence of the wheel.
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Old 05-06-2004, 02:44 PM   #3
banman
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Yeah, I have one already, I'm just trying to figure out how I would tap the signal to feed to a laptop.
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Old 05-06-2004, 02:48 PM   #4
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A few ways I can think that it would be connected.

1) there are two pickups... one connected to each wire. As the magnet passes each pickup, the voltage on the wire would change state (0->1 or 1->0). You could figure out the direction of the wheel turning by watching the edge on each transition. Problem with this theory is that you'd need 2 more wires... one for power one for ground.

2) the 2 wires are power and ground. There is one pickup with the output capacitively coupled to the power line... when the state of the pickup changes there would be a quick pulse on the power wire... these pulses could be counted.... direction would not be possible on the odo.

You'd really just need to use an oscilloscope on each line to find out what's going on... it won't be that complicated.
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Old 05-06-2004, 02:48 PM   #5
anders8
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dunno, could be different for different bike odos. however, youwouldn't want to use a reed switch. you've got the right idea though. what you want is a "hall effect sensor" or the like. it's the same thing, detecting a magnetic field, but it's solid state with no moving parts. however, it really does depend on the design of your odometer. Fortunately, the inputs to these things expect some rough (electrical) handling, so you should be about to try out several ideas to get it working. get it working on your bench first, and _then_ figure out how to install it on the car.

Anders
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Old 05-06-2004, 02:50 PM   #6
rexxer
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The "pickups" I talked about are Hall Effect sensors. How they are connected would be the mystery.
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Old 05-06-2004, 02:58 PM   #7
banman
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I have a SigmaSport BC500 installed on the front half-shaft . . . seems to work pretty well. Looking at the sensor, I can't tell if it's solid-state or not, but it probably is. The bike computer can't tell direction, so given the fact that there are only two wires and two contacts, I think rexxer's 2nd scenario is what's going on.
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Old 05-06-2004, 02:59 PM   #8
anders8
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I designed and built a custom rally computer a while back:

Rallyac-7

Still using it for stage rally competition.
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