The goal is to use 4 units of 50kg load cells in Wheatstone bridge to act as a load detector. It should output a logic 0 or 1 if the load is greater than a threshold value. A MCU will read the states of 100 load detectors through a series of PISO shift register. Potentiometers will be used to adjust threshold level and they have to be placed near the MCU which is 5-10 meters away from the load detectors.
I have trouble determining a circuit to read the differential voltage signals from the bridge. A signal amplifier IC and a comparator IC might be sufficient. But is there other approach?
The default load is around 2kg. The threshold is around 5kg-20kg.