Preliminary Shift Register Test utilizing push button switches.
More digital input than the 13 pins of Arduino board can readily handle were required for the elevator interface. Using a parallel to serial shift register allows information to be gathered from 8 or more switches while only using 3 of the pins on your Arduino. The shift registers can be daisy chained together to create an "unlimited" number of switches.
Elevator Interface Prototype utlizing three Shift Registers
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