I have been working on an electric power steering unit and have recently made a change because the sensor out put wanders some. I don't know, but suspect it is temperature related. I am using strain gauges to sense the torque on the steering wheel and then power the motor to reduce the torque back to zero. I was wondering if there is a way to capture the voltage of a Wheatstone bridge at rest to be compared that to the torqued bridge to derive how much drive the motor needs. Then if temp changes the at rest output of the bridge or if it just wanders, capture that voltage and updated and use that voltage. Updating the capture and hold could be tied to the key of the vehicle start up.
Here is a link to pictures of the strain gauge build and schematic, also shown below, of concern is the portion with in the brown box.
Thanks
Kinarfi
**broken link removed**