Many automobiles incorporate logic circuits to alert the driver to problems or potential problems. In one particular car, a buzzer is sounded whenever the ignition key is turned and either a door is open or a seat belt is not fastened. The buzzer also sounds when the key is not turned but the lights are on. In addition, the car will not start unless the key is in the ignition, the car is in park, and all doors are closed and seat belts fastened. Design a logic circuit that takes all the inputs listed and sounds the buzzer and starts the car when appropriate.

Question

What will be an ideal response?

Answer 1

Analysis:

Let's design two different circuits for the buzzer and the starting conditions.

For both circuits we find first the Karnaugh map and then the minimum expression and the circuit to implement it.

A = Ignition key (1 if turned); B = Door (1 if closed); C = Seat belt (1 if fasten); D = Lights (1 if on); E = Park (1 if on);