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Digital Speedo readout
Mark H - 7/11/02 at 11:47 PM

Hi Guys,

Has anyone seen a little square three-digit lcd type speedo in any catalogue?

Any idea if it is harder to wire up than a standard mechanical one? (Although its a lot damn sexier!)

Cheers,

Mark

David Jenkins - 8/11/02 at 07:38 AM

Made my own!

MK9R - 8/11/02 at 08:00 AM

Try mountain/road bike magazines. Some of the speedos (computers) register into the 100's.

Dead easy to wire up, sensor picks up a magnetic field from a small magnet which goes on the wheel or drive shaft. You then calibrate it by putting in the diameter of the tyre. The cordless ones are a bit shitty as they can give false readings.

Try www.wiggle.co.uk or www.chainreactioncycles.com

Mark H - 8/11/02 at 08:06 PM

Cheers,

David - have you got a piccie of it, for research purposes you understand! I think that's gotta be the way to go...

MK9R - thanks for the website addresses, I will go and have a look.

Mark

stephen_gusterson - 8/11/02 at 10:46 PM

using puhbike speedos has been done before and can cost just a tenner!

i think TOL files section has a bit on it


atb

steve

david walker - 12/11/02 at 10:29 PM

Thanks Steven and the rest. I've been looking to fit a bike speedo for a while. Sunday pm I found this site: www.strangely.org/owned/bikecomp/index.html which gives a good summary of fitting same to a Caterham.

Sunday evening I ordered a Sigma Sport BC1400 for £25 all up (this is a top model!). I purchased directly from www.sigmasport.co.uk.

This morning, Tuesday it has arrived! That's what I call service.

I'll let you know how I get on with it.

David Jenkins - 14/11/02 at 09:14 AM

quote:
Originally posted by Mark H
David - have you got a piccie of it, for research purposes you understand! I think that's gotta be the way to go...

Mark,

I would, If I could put a picture somewhere!

I can't update my site at the moment 'cos ftp isn't working to Virgin at the moment. I'd put one here, but...

All I can say is that I've mounted the speedo and tacho on a single board about 5" x 4". The speedo is 7-seg LED displays and the tacho is a line of 40 or so rectangular LEDs.

It's only been tried on the bench so far, and I don't know how it will behave in the hostile environment of the car, but I've tried my best to make it 'spike-proof' and resistant to interference.

cheers,

David

interestedparty - 14/11/02 at 11:07 AM

David, all you need to do is reply, and at the bottom of the reply panel there's an attachment browse button. Just navigate to the picture and it should appear with your post. I think. I'll just experiment with a convenient picture

John

edited to say that instead of the picture a link appears, and those interested can download the picture (Sparky was one of our foster cats, BTW, so don't bother downloading unless you like cats

[Edited on 14/11/02 by interestedparty] Rescued attachment sparky having a snooze.JPG
Rescued attachment sparky having a snooze.JPG

David Jenkins - 15/11/02 at 08:34 AM

Fine... but the photo has to be somewhere that can be accessed with a URL - and my ftp isn't working.


David

David Jenkins - 21/11/02 at 01:56 PM

I've managed to get my FTP working (under Linux!) so hopefully I can get a picture up in the near future.

David

geoff shep - 24/11/02 at 01:10 PM

The attachment option adds a file from your computer.

If you want to add a picture that is already on the www to your post, use the
button



The problem with pictures any bigger than that is that they slow the BB down so its best to link.

David Jenkins - 24/11/02 at 08:42 PM

Sorry for not posting a picture - I haven't taken it yet, as I've been busy working on my car!

In the mean time, you can look at the circuitry on a prototyping board - only the nearest processor is involved - the other is a pulse generator used for calibration.

speedo prototype

regards,

David

P.S. If you select the following link - mypages - then select the steering wheel, then 'instrumentation', you will see the background to this project.

[Edited on 24/11/02 by David Jenkins]