Air Temp Sensor Conversion??? - Electronic Circuits Projects Diagrams Free

fritts · 25th May 2007, 09:14 PM

I would like to create a circuit (assuming needing a micro) to convert the sensor output of one NTC air temperature sensor to another. The two sensors have completely different voltage/temperature cures and are not linear. What would be the best way to go about taking one voltage input and converting it to another? Both sensors are run from 0-5 volts.

Thanks

bloody-orc · 25th May 2007, 09:28 PM

get another sensor...
it's quite hard to produce analog signal with a micro.

fritts · 25th May 2007, 09:39 PM

The issue is that the stock sensor is a closed element and does not react very quickly. I am trying to use a standard GM air intake temperature sensor with an open element to supply air temps to the ecu.

Oznog · 26th May 2007, 01:36 AM

Prob is that a sensor has a variable resistance. There are ways to do this with a PIC's pwm output but it varies depending on the circuit reading it. A resistance output is not so straightforward as a voltage output.

I'm in the "get another sensor" camp. Maybe you could cut up the GM sensor housing and insert the thermistor you took out of the stock sensor.

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25th May 2007, 09:14 PM	(permalink)
fritts	Air Temp Sensor Conversion??? I would like to create a circuit (assuming needing a micro) to convert the sensor output of one NTC air temperature sensor to another. The two sensors have completely different voltage/temperature cures and are not linear. What would be the best way to go about taking one voltage input and converting it to another? Both sensors are run from 0-5 volts. Thanks

25th May 2007, 09:28 PM	(permalink)
bloody-orc	get another sensor... it's quite hard to produce analog signal with a micro. __________________ Need Help? Press F1 If that doesn\'t help you, ask me... I might know better.

25th May 2007, 09:39 PM	(permalink)
fritts	The issue is that the stock sensor is a closed element and does not react very quickly. I am trying to use a standard GM air intake temperature sensor with an open element to supply air temps to the ecu.

26th May 2007, 01:36 AM	(permalink)
Oznog	Prob is that a sensor has a variable resistance. There are ways to do this with a PIC's pwm output but it varies depending on the circuit reading it. A resistance output is not so straightforward as a voltage output. I'm in the "get another sensor" camp. Maybe you could cut up the GM sensor housing and insert the thermistor you took out of the stock sensor. __________________ I thought what I'd do was I'd pretend I was one of those deaf-mutes.