I am getting around 2.47 V. This is about what I want but there are still errors. When measuring the bridge voltage there is a voltage increase when the load cell is loaded but when measuring the op amp output there is no discernible change in voltage when loading the cell.
I am running out of time on this project and am very worried at this point.
I have tried various levels of gain from 100 to 10000 but still no improvement. I would also like to balance the bridge by attaching a potentiometer in parallel with one of the bridge resistors but no matter what potentiometer I use I can not get the unloaded bridge to read zero volts. As far as electrical engineers go I am on my own. I have mechanical and aerospace professors to ask questions to but no electrical.
The bridge and the op amp have separate voltage sources. The arduino is providing a 5 volt excitation voltage to the bridge and the op amp has a 9 v external excitation voltage.