ok don't know whether this is the right place or not however this question relates to an automotive application. What I have is a voltage from an Engine Coolant Temperature sensor (ECT). As the temperature increases the voltage sent from the ECT to the ECU decreases. I would like to run a temperature gauge off this wire going to the ECU but I can't because it changes the signal and basically causes the engine to run rough as guts. What I would like to do is take this wire and use it as an input into a little circuit that gets its own power supply. I would then like to subtract the sensor voltage from a reference voltage (5V) and use this as the output to the temp gauge.
Is there an easy way to do this? I can get the required parts and assemble but have absolutely no idea what I'm doing with this side of things.
Sounds like an inverting op-amp is all that is required, if you keep the amplification at x1 then there will be a very high impedence and the ECU won't know it's there. So google, opamp inverting circuit, and look for the easiest one.
Sounds like an inverting op-amp is all that is required, if you keep the amplification at x1 then there will be a very high impedence and the ECU won't know it's there. So google, opamp inverting circuit, and look for the easiest one.