Output Voltage minimal Changing in bfs

[Rocky Richi]

Hello everyone,

I'm working on an electronics project that uses a flexi force sensor A201 , INA333 instrumentation amplifier and esp32 module ,and I've simulated the circuit using lt1167(in place of ina333), changing the resistance value(in place of sensor) and used behavioural voltage source (in place of adc value conversion on esp32) in LT spice.

However, I'm running into an issue:
when I apply force to the sensor, I observe minimal step variation in mV range in the LT1167's output voltage and  no or minimal step variation on bv source values

What I Have Tried So Far :
 
1.Tried to invoke the ina333 spice models but simulation was not behaving properly.
2. hence used lt1167 built in library ina which is present on ltspice platform.
3. I updated circuit to resolve the issue by adding capacitors to ensure the noise is the problem.
4. Later I checked for the different voltage levels but no change.
5. Later I thought voltage divider may  be problem and hence removed it but no effects.
6. also changed r2 value and gain r3 value but it just increased the output voltage swing and bv source value.
7.Also employed the opamp to provide the stable buffer to ref pin.

Are there any circuit modifications or additional components that could help enhance the sensitivity of the circuit?

Any suggestions would be greatly appreciated !

[/img]