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any interest in a backlit speedo?
02GF74 - 6/1/06 at 09:20 AM

quite a few people are using bike speedo but on problem is no back light. also I am not sure if they will show speeds above 99 mph (2 digit LCD display).

I am looking for an excuse to buy a PIC development kit and one possible use is for a speedo.

The idea, and it probably be never get past that stage is for something like this:
- 2 LCD displays to show:
- 3 digit mph (4 digit is a pos. to show 1/10ths)
- 6 digit odomoter, (0-128,000 miles)
- simple one time programming according to tyre diameter set by switches
- coloured LED back light
- battery back odometer; reset by removing back up battery
- size should not be larger than a playing card (dunno for sure)
- could use 2 or 4 wheel sensors so can update faster than once a second although I reckon more than 4 times a second would be too fast.
- accuracy should be better than 5%

Now cost - dunno yet so is anyone interested? And how much would you be willing to pay? Bear in mind it is not much more sophisticated than a bike speedo.

Just looking for an excuse to get into PIC.

emsfactory - 6/1/06 at 02:02 PM

What is PIC?

chrisf - 6/1/06 at 02:22 PM

Have you looked at BobC's work? He's done a similar project. It takes a smarter man that I, but I suppose it would be fun to build--and quite the accomplishment!

--Chris

[Edited on 6/1/06 by chrisf]

02GF74 - 6/1/06 at 02:31 PM

quote:
Originally posted by chrisf
Have you looked at BobC's work? He's done a similar project. It takes a smarter man that I, but I suppose it would be fun to build--and quite the accomplishment!

--Chris

[Edited on 6/1/06 by chrisf]


I have and I don't mean to take business away from him. What he has done is far far more sophisticated, almost in the digidash realm.

My design is intended to be very lowcost; a small step past the cycle computer. I haven't done pricing but my gut feel it isn't going to be worth my while as it may sit too close to a off the shelf speedo which come in at around £60 or so. Something to do in the evenings until it gets wramer I guess.

PIC = a single chip microcomputer; comprises micropocessor, memory, I/O and other peripherals such a timers, A/D etc.

[Edited on 6/1/06 by 02GF74]