The diagram below describes a Wheatstone bridge designed with MATLAB Simulink, The resistor designated [R x] can be replaced with a variable resistance material and used in the construction of a strain gauge.
DC Voltage = 100 v
R 1 = 10 ohm, R 2 = 10 ohm, R 3 = 10 ohm, R x = 5 ohm
Connect the components as seen in the diagram then run the simulation, let [R x] be the variable resistance material; vary the resistance to see the difference in current.
NB: Resistors were taken from the powerlib Simulink components [Parallel RLC Branch]