Mark18
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| posted on 10/2/05 at 03:59 PM |
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Bicycle speedo sensor with Tachometer
I have noticed some people use a bicycle speedo on their cars, but what would it involve getting just the bicycle speed sensor to work with the speedo
clock I have? Specifically Fireblade clocks.
I presume the little thing that was attached to the motorbike's sproket is a motor, so that would put out voltage with speed, essentially making
the bike's tacho a voltmeter. The one thing that's confusing me about the little motor is that there are 3 wires coming out of it instead
of just 2 as you would expect. I'll post a pic of this when I get home.
As for the bicycle sensor, I would imagine that gives out a small voltage everytime the magnet passes it although I have read that it may give out a
steady voltage which would be handy, then all you would need is just a way to multiply the voltage to the correct scale for the tacho. Even if the
bicycle sensor gives out pulses, couldn't you resolve this with a capacitor.
The last question I have is would the bicycle sensor be accurate if it was spinning at x hundred rpm if the magnet was mounted on the propshaft?
Mark
"I don't know what I may seem to the world. But as to myself I seem to have been only like a boy playing on the seashore and diverting myself
now and then finding a smoother pebble or a prettier shell than the ordinary, whilst the great ocean of truth lay all undiscovered before me." -
Isaac Newton
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britishtrident
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| posted on 10/2/05 at 05:45 PM |
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Cycle speed pickup is a simple reed switch that switches on for an instant as the magnet passes -- many speedos work this way including those used
in traffic police cars.
Most OEM car speedos use Hall effect swiches really a semiconductor doing the same job -- the hall effect type normally have 3 wires - power
(usually +5v), earth and output.
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Hellfire
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| posted on 10/2/05 at 06:47 PM |
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If you have the original Fireblade clocks, why not adapt the speedo pickup to run from the diff output flange. All you'll need then is a
speedohealer or yellowbox to correct the reading. Thats exactly how we did it and it was spot on. See our build diary for details. 
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Mark18
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| posted on 10/2/05 at 09:23 PM |
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quote:
Originally posted by Hellfire
If you have the original Fireblade clocks, why not adapt the speedo pickup to run from the diff output flange. All you'll need then is a
speedohealer or yellowbox to correct the reading. Thats exactly how we did it and it was spot on. See our build diary for details.
There's an idea - just as simple and no worrying about whether it will be accurate. What did you use for the rubber bits and how did you get
them to stick?
Mark
"I don't know what I may seem to the world. But as to myself I seem to have been only like a boy playing on the seashore and diverting myself
now and then finding a smoother pebble or a prettier shell than the ordinary, whilst the great ocean of truth lay all undiscovered before me." -
Isaac Newton
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Hellfire
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| posted on 11/2/05 at 12:32 PM |
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Bicycle inner-tube. Smallest diameter you can get. Tube is stretched over wheel to build up a good tyre depth. Doesn't require sticking at
all.
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Mark18
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| posted on 11/2/05 at 01:39 PM |
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Clever.
Mark
"I don't know what I may seem to the world. But as to myself I seem to have been only like a boy playing on the seashore and diverting myself
now and then finding a smoother pebble or a prettier shell than the ordinary, whilst the great ocean of truth lay all undiscovered before me." -
Isaac Newton
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