COMBINATIONAL LOGIC Circuit Design

Steps Create the truth table Extract the Boolean Expression from the truth table or create a K-Map Simplify the expression Draw the schematic Build the circuit

Logic Problem Design a safety alarm system for a car that alerts the driver when the seatbelts have not been fastened, or when the door is ajar while the key is in the ignition. A=Key B=Door C=Seatbelt A B C X 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 Boolean Expression Is: ABC + ABC + ABC=X 1 ABC 1 ABC 1 ABC

Create Expression & Simplify K-Map Boolean Simplification C 1 AB 00 Dist. 01 Th. 6 11 1 1 Th. 4 Dist. 10 1 Th. 11 Dist.

Create Circuit Schematic X

NAND Only Solution

CircuitMaker Demo