Air pressure sensors - Length of cable

Hi All,

I'm building IoT project where I install air pressure sensors to monitor vacuum and air pressure of the machines. I think to use this sensor: https://ie.rs-online.com/web/p/products/1115921/

My question is: What is the length of cable I can use on those connected directly to Arduino or powered with the external power supply?

Best Regards,
Konrad

Wire length probably isn't a problem. The issue would be noise. It says the load resistance should be greater than 5K which "hints" that the output impedance is probably 500 Ohms or less and that should be fairly noise imume. If you get noise pick-up you can put a capacitor in parallel with the output, use shielded cable, or use a smoothing algorithm.

You can get shielded cable though with CAT the wires are very thin. Telecom pros use wire splicers like 3M SkotchLoks instead of solder. A box of splices can run 25 to 50 cents each... a few years ago at least.

You could add a small dedicated controller to the sensor. It would do the ADC and send digital data back to the main controller perhaps on the I2C bus with others also attached.

Thanks for help.

Perhaps filtering library like this one Exponential filter for smoothing noisy data - Reference - MegunoLink would be a good option too?

Also some tutorial here: Three Methods to Filter Noisy Arduino Measurements - Coding - MegunoLink

DVDdoug:
Wire length probably isn't a problem. The issue would be noise. It says the load resistance should be greater than 5K which "hints" that the output impedance is probably 500 Ohms or less and that should be fairly noise imume. If you get noise pick-up you can put a capacitor in parallel with the output, use shielded cable, or use a smoothing algorithm.

Any advice on what capacitor to use?

You don't say how far you want o run the wires. Since the Analog input of the Arduino is high-impedance, I wouldn't hesitate to try a run of 20 ft or more before exploring other more exotic solutions to a problem you may not even have,

+1

For sure, try the simple ways first!

PX3AG1BH010BSAAX is the 5volt analogue-out version.

If you're worried about wire length and noise,
then you should have bought the industrial version (CH) with 4-20mA output.
Leo..

Perfect, Thanks a mil for all the info.