Closed Loop Control Circuit Design of an Automatic Fire Suppression System

Automatic fire suppression systems control and extinguish fires in buildings without human intervention from widespread use of the techniques of measurements and control. Automatic control is achieved here by a design and implementation process. This system implements an early detection system and communicates it to the inhabitants. The system is designed with the input voltage from the smoke detector sensors, BC107B transistor used as the input, Opto-coupler circuit, an alarm and photoelectric detector. For this case we have voltage divider circuit using a Light Dependent Resistor and potentiometer. This design uses a fan instead of a pump as it uses the same principle to test its performance giving standard resistance, Opto-coupler circuit biasing voltage and resistance of the light dependent resistor. Generally the components used are cost effective and feasible.