The purpose of my project is to build a sufficiently accurate "Strain indicator" based on the use of a Wheatstone bridge using an Arduino. Currently I am using a HX711 as load cell amplifier which is working well since I use it with a full bridge.
Currently I want to connect only one strain gauge to a wheatstone bridge built using 3 resistances of 120Ohm (0.1%). I am able to measure something but I want to balance the Wheatstone bridge. My inexperienced question is it is possible to add an accurate balance system to my Wheatstone bridge?
I know that classical solution use potentiometer but the principle is based on a choice of a variable resistance with similar value of the others 3 resistances on the Wheatstone bridge (in my case 120Ohm). Unfortunately, finding potentiometers around this value is not possible. In addition the potentiometer must allow very small change of the resistance around 120Ohm.
I am from the mechanical field, sorry if my question seems to be very common...