I am building a Wheatstone bridge for strain gauge measurement. Due to component deviations a wheatstone bridge will often show an offset which needs to be trimmed:
If we assume that we're using 5% resistors, the worst case would be that R1=950ohm and R2=1050ohm, making the reference equal to 1.575V (when Vcc=3V), which will through the measurement way off - expecially when amplified 1000 times. So my question is, what do you think is the best way to trim such an offset digitally?
I want to be able to trim and calibrate the bridge with a microcontroller.