Motion detection circuit for electronic weighing system

摘要

For use in an electronic digitizer such as employed in an electronic weighing system, a circuit for detecting motion and providing a digital output signal. The circuitry includes a dual slope analog-to-digital converter having means for retaining a representation of the integrated analog level of a present and previous conversion cycle, the levels being representative of sampled data. The stored amplitudes are compared to provide an analog difference signal, and an output signal representative of measured weight is provided only when the difference signal is less than a predetermined reference threshold.