2) Differential Amplifier Circuit: In general, the output of
such a load cell is rather small – the maximum voltage change
of the load cell is less than 6 mV under stress corresponding to
the gravity of 50 kg object/subject (its capacity). This makes
it difficult to get the accurate value from the A/D converter.
Thus, we use a Differential Amplifier circuit to enhance the
signal that we get from the strain gauge. The amplifier model
that we use in our project is INA126 [2].