Programmable Resistor suggestions?

[z0d]

Hello world,

I'd like to create a sensor circuit say for either temp/pressure/conductivity [OR ALL THREE, SEPARATELY OFC] that incorporates a wheatstone bridge. In it, I'd like to have a programmable resistor that'll auto-compensate ( no manual adjustments necessary ) the changes in Rsensor.

Wanna add that the sensor just has to work in a limited range, so the programmable resistor doesn't need to have an insane range.

Is this far-fetched? Else any suggestions would be welcome and appreciated. Please ask if I'm missing out any important details.

Thanks y'all!

 

[Old Steve]

A digital pot and a micro with A-D?

 

[z0d]

Gratitude for the speedy response!

That simple eh. Yeah I actually just came across one, the CAT5270. I'll give it a try.

Thanks Steve!

 

[Old Steve]

No problem, glad to help. I figured that basically a micro with A-D and an op-amp or two for sensing could probably control a digital pot to do what you want, provided the digital pot has good enough resolution.
Also check out Xicor for digital pots, if the CAT5270 isn't suitable for your needs.

 

[z0d]

I figured that basically a micro with A-D and an op-amp or two for sensing could probably control a digital pot to do what you want, provided the digital pot has good enough resolution.
Also check out Xicor for digital pots, if the CAT5270 isn't suitable for your needs.

Yeah makes sense. I'd say a simple solution for a simple need. Aight will check out the other DP.

Thanks again!

 

[Old Steve]

Here are some others to check out, with 4 times the resolution of the CAT5270. These have 1024 taps, instead of 256:-
http://www.maximintegrated.com/en/datasheet/index.mvp/id/4730