Microsoft Word - Digital Logic Design v_4_6a

Example – Basics of Digital Logic
Develop a system diagram and truth table for two gates that ensure only one fish leaves the
Outer Door at any one time. Below is the physical diagram of the system:

Aquarium

Inner Door Outer Door

Holding Area

• Holding Area has a sensor with 2 bit output

( 00: empty, 01:one fish, 10 & 11: more than one fish)

• Each door has one input where logic “1” opens and logic “0” closes the door.