We were given a task to design an

alarm system

We must do in group

“The system use 4 switches.(SW1,SW2.SW3.SW4). The alarm will be trigged if 2 or more switch is closed at the same time. Design the system by using NAND GATE

only.”

Construct a truth table.

Find the SOP.

Find the equation by

using Karnaugh

Map.

From the equation found, we

can draw the alarm circuit.

Change the circuit drawing

to Universal Logic gate drawing.

Simplify the circuit.

Make the practical based on the circuit.

From the K-Map , we got the equation as

below

L1 + L2 + L3 + L4 + L5 + L6

AC+ BC +AC + AB + BD + CD

A

B

C

D

A

B

C

D

A

B

C

D

At the end of this task, we learn that how to design an alarm system using NAND logic gate.

Furthermore we also learn that logic gate have a relationship between each other.

Finally , we need to learn about logic gate to make an alarm circuit to make it function well.

~(‘.’~)(~’.’)~