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.
A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown component. Its operation is similar to the original potentiometer. It was invented by Samuel Hunter Christie in 1833 and improved and popularized by Sir Charles Wheatstone in 1843. One of the Wheatstone bridge’s initial uses was for the purpose of soils analysis and comparison read more
Simulink Circuit Schematic:
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]