The platform is based on four 1 kg load cells connected to instrumentation op-amps. The idea is to measure the force distribution on the four sensors according to the finger position on the plate. Please see schematics and picture below.However I have inconsistent data coming from the four sensors. One sensor seems to be at end of its range even without pushing on the plate, another seems to be at the other end of the range, there's only one providing expected data. I wonder if it has something to do with the electronics or rather with the mechanics.
it seems I have electronic issues (several inputs reacting to the same sensor, very strange...).
If you want to use 4 cells, you will need to have some sort of adjustable spacer to support one of them so that you can get it level.