Auto Pressure Sensor

Other Hardware Sensors
1

Hello:

Has anyone tried to use an automotive oil pressure sensor in a project? I need help trying to do same. The one I have is for a Chevy 2003 Silverado. It has just three wires Gray, Blue & Black, from GM wiring diagram Gray is 5V, Black is Grd and Blue is Signal. I can't seem to get any kind of signal out when I pipe in air pressure to the sensor, neither a voltage nor a resistance change. I am stumped.

Thanks

2

Very popular project, as a quick Google search will reveal. Hint: "arduino auto pressure sensor"

3

Find the part number for your sensor, and look up the data sheet. See what you can expect on "signal".

You sure you're supposed to get an analog signal? The wiring does suggest so, but better make sure.

4

in general, the auto pressure sensor has 3 kinds of operation modes

  1. works at 10-30V VDC -- in this case the signal could be 4-20mA,0-5V DC, 1-5V DC.
  2. works at 13-30V DC -- in this case, the signal could be 0-10V or 2-10V DC voltage
  3. works at 5-5.3V DC -- in this case, the output could be 0.5-4.5V DC ratio-metric output( also known as ratiometriC output).

looks like your sensor is the 3rd one. You will need a high gain ADC which can read very low voltages. Look into MCP3428/MCP3426/MCP3427. it has programmable gain with inbuilt voltage ref and 16 bit resolution.

5

Batman_429:
the output could be 0.5-4.5V DC...

You will need a high gain ADC which can read very low voltages.

:confused:

An output of 0.5 to 4.5 V DC would be a nice match for a 5v Arduino's no-gain ADC (provided 10-bits is acceptable to the OP).