Appendix
F Using SM231 Weighing Module and the Library
Weighing module converts the voltage signal of weighing sensor to digital AIW, the function of
SM231 weight module is to turn it into actual weight.
Figure F-1: The principle of measuring weight
You can obtain the linear relationship equation between weight and analog value via point a and
b from diagram above, then you can get the actual weight of AIW. So as to get the coordinate
value of point a and b, you need adjust zero and calibrate.
Zero Setting and Calibration method:
First suppose the weighting sensor has fixed to the horizontal direction, and the pallet has
horizontally fixed on the weighting sensor.
When setting zero, don't put anything on the the pallet, you can get the Zero-analog value while it
is stable.
When calibrating, the weights for calibrating are placed to the pallet, you can get the calibration
analog value while it is stable.
F.1 Weighing Library Function Illustration
Weighing module correspond to weighing library EM231_7WA_LIB (V1.4), library files download
address: www.co-trust.com
Weighing library instructions parameter:
Weighing library configuration
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