Unitrack engine temp sensor

[mattc]

Hi folks, my two GPz1100B1 chassis have modified GPz Unitrack motors in them. They therefore do not have any of the usual Unitrack meters or wiring and I was wondering whether any members had done something clever and built a resistance to temp meter to display the actual engine temp in degrees C..? Something you can mount on the bike and get a constant read out from.

The cyl head temp sensor is a Thermistor with Negative Temp Coefficient (resistance to ground reduces as temp increases) and the manual provides an upper/lower spec of range of values. You need three values to work out the actual temperature at any specific resistance using the famous Steinhart-Hart equation......which hopefully some of you are experts with.

http://www.thinksrs.com/downloads/progr ... ulator.htm

So to be accurate for any individual Thermistor it needs to be calibrated and the three resistance/temp points found.

So I just need the design for some electronics to sense/measure the Thermistor resistance, probably convert to a voltage then a digital representation and use a microprocessor to do the maths and drive a 3 digit LED display. Simples.....

I could design this myself buy I would rather freeload off someones previous design if possible.

Any other smart ways people may have addressed this would be welcome.

Thanks

Mattt