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
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.
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.
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.
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.
Clever.
Mark