Charge rate, capacitive switch system

摘要

A plurality of capacitive switches, which are actuated by the touch of a user, are coupled to unique pairs of conductors. The conductors are sequentially actuated, or interrogated, and simultaneously coupled to a charge rate detector that compares the capacitance associated with each conductor to a reference capacitor. Storage means coupled to the output of the charge rate detector stores an indication of whether the capacitance associated with each conductor is greater or less than the reference capacitor such that the stored indications constitute a two of N code that identifies an actuated capacitive switch.