I thought you guys might like to see the system
I'm working on for my F2. As you can see, the display will show MPH, Voltage, Ambient air temp and the current gear.

Gear is calculated based on the ratio of the engine RPM to wheel RPM.
MPH is calculated based on tire diameter and wheel RPM.
Temp is measured using a one-wire temperature sensor. I added it because I had the hardware sitting around.
Voltage is directly measured on the bike. Given the history of R/R/Stator issues, I find having the voltage on a display to be really, really handy.

Right now I've got the system mostly working, I'm just working on dialing in the speed sensor/healer functions. The cost to build one like this is about $50 for prototype parts, I'll likely reduce the cost one I have a production design worked up.

 

i like it man, good work.

 

damn, thats cool

 

great man, i'll pay much attention to your procedure post

good work

 

any ideas as to when you will have these ready for the masses?

 

How did you interface with the tachometer? And yes, I'm looking for the technical answer. I had a feeling that it might be you when I stumbled on your website of projects last week :-)

 

This is awesome - I'm very interested in building one of these for my F3. Other useful functions could be coolant temp and clock. Keep us posted with the progress!

And I'm assuming this is your blog
http://biobug.org/index.php/2010/04/...ycle-computer/

 

How will you deal with the clutch being pulled in? I would expect the display to show neutral. Maybe you can fix that with some fancy programming. I suppose you're limited on the amount of data you can display unless you go to a larger screen which is probably much more difficult to work with. If you do get room for a clock, I've had very good success with the DS1307 Real Time Clock (one-wire interface)

 

Right now just about everything is semi-working. The speed display has a bit of jitter to it, and once I have some more time I'm going to get that cleaned up. Once I do, I'll rework the design to a production board and order a prototype run before getting a batch made.

The 4fi gauges have a clock, but it should be pretty easy to add it. I'm tempted to add a clock chip anyway just so I can get data logging out of it with timestamps.

I'm seriously considering adding a sd or microsd card to the end design so that we can pull data off of it and use the output to tweak values.

 

thats pretty bad *** man. Id be interested in attempting