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Temp display

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G-wiz

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Another one for my track bike.

As im ditching the original instrument cluster. I need a temp display, i'd like to make use of the orignal temp sensor fitted in the engine. This has a single wire feeding a resisted ground back to the display.

I understand that the range of resistance isn't known to any who can answer so if there's a circuit that would work and allow me to calabrate the reading this would be great !

Many thanks again guys

Glen
 
If you're measuring the water temp of the engine, you can use a bowl of water and a thermometer to measure the resistance of the sensor at different temperatures.

You can make a voltage divider with the sensor and a pot. Connect to an op-amp & use another pot in the feedback circuit to control gain.
 
stef said:
You can make a voltage divider with the sensor and a pot. Connect to an op-amp & use another pot in the feedback circuit to control gain.

Thanks for the reply mate, but i'm not sure how i would make a circuit up with a op-amp ??

You'll have to treat as a bit of an idiot, as using IC's is all new to me.

Can anyone help ???

Cheers
 
Don't worry, op-amps are not exactly my forte either; give me a PIC any day :D :D

Unfortunately I don't have a schematic to post, but here goes: connect a resistor & the sensor in series between supply pos & neg. The node between sensor & resistor goes to inverting input of op-amp. Non-inverting input goes to Gnd. Connect resistor between output & inverting input(feedback).

Not sure which IC is best, but search the forum for op-amp related topics, you should find loads of info.
 
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