Need to do an experiment where I masure the strain of wood due to changes in temperature. I believe I need to use 2 strain gauges, one to measure the strain and the other to act as a dummy to cancel out any affects that heating will have on the strain gauge. I also know that a wheatstone bridge needs to be used to find out the very small changes in resistance. What I don't know is how to link all that together to get some results of strain. Does anyone know how I can put my strain gauges into the wheat stone bridge equation to come up with a value of strain? I think it will look something like this: 4(Vout/vexternal)/Gauge factor = strain Is it right? Many thanks!