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I threw together a straight forward iOS app for me to more easily test this thing and see data in real time and also allow me to calibrate more simply.  It also shows the weight of anyone standing on it.  All this is handled via bluetooth.

Not much to say about it so here's some screenshots:

Home Screen:

 

Raw data for each load cell in real time:

 

Calibration screen to calibrate each of the 4 load cells:

 

Display weight of a person:

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