Hello!
The bridge method should work. However, due to the accuracy of both fixed and
variable resistors, you should have some means to tune one of the other
resistors. Is it for a few samples or even one system, or is it for mass
production? In this latter case, you should have a way to auto-tune your
system. In this case, you may use digital potentiometers controlled by
your MCU, but the accuracy will be bound to the digital potentiometer accuracy.
What is your target accuracy?
Dora.