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construct a wheatsotne bridge and connect it to an op-amp (it depends what signal you want to use how much amplification) once that is determined use signal isolation again u know the voltage. if u have trouble calculating then ma suggestion is to use something like electronic workbench
There is much better solution to solve the problem. It's better to use specialized chip AD7730 (Analog Devices) designed for strain gauges. The AD7730 is 16/24 bit A/D Sigma-Delta converter which has two differential inputs to connect strain gauges and four voltage (differential) ranges: 10, 20, 40 and 80 mV. The chip provides you with very useful functions such as zero and full scale trimming. The biggest advantage of the AD7730 is that it has special function called "tare removal" that is, possiblility of measuring voltages from unbalanced strain gauge bridges which can reach quite high levels: -37...+37mV. With AD7730 you're free of using any additional components such as potentiometers etc.
Data from the AD7730 is read via serial interface compatible with SPI. You have access to its internal registers which allows the user to change measurements parameters. Obviously, if some parameters are not satisfactory for you (for instance input ranges or conversion speed) you can be made to use classic methods, that is, istrumental amplifier + A/D converter + additional circuts (if necessary).
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