Hi everyone,
I’m working on a simple pressure measurement project that should handle both negative and positive pressure. I chose the GZP168-003S pressure sensor, but the datasheet I found is very barebones. It shows a “general use circuit” / “amplifier example” but doesn’t give any resistor values or design notes.
I want to condition the sensor signal so I can read it with a STM32 ADC. I figured I’d follow the schematic and use a 3-op amp instrumentation amplifier topology, and I picked the AD623ARZ since it’s a common in-amp chip.
My issues / questions:

• What resistor values should I use for gain or filtering?
• Should I power the sensor/amp from 3.3 V or 5 V (MCU is 3.3 V)?
• Do I need extra filtering caps or RC networks before the ADC?
• Has anyone here worked with GZP sensors (or similar bridge-type/differential pressure sensors) and can share a schematic or example values?

I already tried asking on Reddit but got no replies, so I thought I’d ask here since this community seems more hardware-focused.
Any help or pointers to proper application notes would be greatly appreciated
Link to the datasheet
And that's what I've done so far, but I have no idea if it's right or not!!

 

If that pressure sensor is a full bridge type, then there is an error in the connections shown, BECAUSE there needs to be a connection for Vs- (bridge supply voltage negative.)
Now the questions:
What is the output voltage range of that GZP168-003S pressure sensor device?? What is the "zero-pressure" output?
Is that AD623ARZ amplifier intended for a single supply operation? Or should it have negative and positive supply voltages??
Will the STM32 ADC accept both positive and negative inputs??
Do you need to provide an output-offset voltage ?

Did I scare the TS away with those questions???

 

Evidently I did scare them away. Sorry, folks.