Version 1.0, August 31, 2001, Copyright, Hugh Jack 1993-2001
· This method switches between two logical DC voltages.
· Typically the low voltage is 0V and it indicates a false condition.
· The true state is normally indicated with a high voltage. 5V is quite common, but other voltages can be used for certain sensors.
· The voltage levels have certain tolerances built in. For example 0V indicates false, but a voltage up to 1.2V might still be considered false. This also means there is an ambiguous zone where the voltage will be judged neither true or false. This zone can be eliminated using schmitt triggers.
