Perspex Bar Load Cell

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Uploaded by on Jun 1, 2009

This could probably be called version 0.1 of my load cell. It uses a 350-Ohm gauge glued to a perspex bar. The gauge forms one arm of a Wheatstone bridge circuit (which you can just see on the rear-most prototype board). The output of the bridge then goes through an op-amp setup, which is connected to an A/D-conversion pin of the microcontroller (a PIC18F4550).

This is really just a proof of concept to check that I know how to build a simple amplifier for the load cell, and could put together the Wheatstone bridge circuit correctly. The real load cell will use an instrumentation-quality differential amplifier instead.

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