Design a logic circuit for a simple automobile door and seatbelt buzzer system.

Question

Design a logic circuit for a simple automobile door and seatbelt buzzer system. Assume that sensors are available to providedigital signals representing the door and seat belt states. SignalA is from the door, where high implies the door is closed; signal Bis from seat belt, where high implies the seat belt is fastened andsignal C indicates weather the ignition switch is turned on. Yourcircuit should output a signal X that can be used to turn a buzzeron or off, where high implies on. The buzzer should be on if theignition is on and if the door is open or the seat belt is notfastened. Draw your logic circuit and construct a complete truthtable.

HINT: Construct the Truth Table,

           Try AND realization

           Implement the logic circuit.  

Explanation / Answer

A B C X=C(A'+B') 0 0 0 0 0 0 1 1 0 1 0 0 0 1 1 1 1 0 0 0 1 0 1 1 1 1 0 0 1 1 1 0 Sorry, my diagram editor isn't working. Just put A and Bas inputs to a NAND gate. Then use the output of the NAND andC as the inputs for an AND gate. If you use just thesetwo gates, there is no need to complement any of the signals. That is all you need for the diagram.

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