1 INTRODUCTION

The beauty of basic logic gates is their versatile use that ranges from almost all day to day life examples to highly sophisticated application areas including bio medical field, industrial field, automobile controls and flight control systems. This experiment demonstrates the use of AND-OR-INVERT (AOI) logic in cockpit warning light.

1.1 APPLICATION: COCKPIT WARNING LIGHT CONTROL

A jet aircraft employs a system for monitoring the rpm, pressure and temperature values of its engines using sensors that operate as follows:

RPM (R) sensor output = 0 only when speed < 5500 rpm

Pressure (P) sensor output = 0 only when pressure < 210 psi

Temperature (T) sensor output = 0 only when temperature < 2100 F

1.2 CONCEPT

A warning light is turned ON and an ALARM is activated whenever the engine temperature exceeds 2100 F AND either the pressure exceeds 210 psi OR the speed drops below 5500 rpm. The truth table is constructed to get the Boolean expression.

TRUTH TABLE