Smoke Detector Alarm Using LM358 Op-Amp

Description

Smoke Detector Alarm Using LM358 Op-Amp

In this tutorial, I will be going to show you a simple smoke detector alarm without using any microcontroller. A smoke detector alarm is a smoke-detecting gadget that shows fire. Smoke alarms are exceptionally normal in homes, workplaces, schools, and industries. Smoke alarms are extremely helpful gadgets as the harm brought about by fire mishaps is disastrous. These days, smoke alarms and smoke cautions are modest as their use is expanding and the expense of assembling is diminishing. In this undertaking, we are executing a basic smoke detector alarm circuit utilizing basic equipment. We utilized a Gas/Smoke sensor for distinguishing smoke.

There are two kinds of smoke alarms i.e Photoelectric smoke alarms and Ionization smoke alarms.

Photoelectric smoke alarms comprise a light source like LED and a light detector like a photocell. The photocell leads as long as the light falls on it. When there is smoke, the light from the source is hindered and the photocell doesn’t conduct.

Ionization smoke alarms comprise two cathodes and an ionization chamber loaded up with particles. When there is no smoke, the particles move openly and the electrodes conduct typically.

Within the sight of smoke, the chamber is loaded up with smoke and intrudes on the development of particles. The anodes don’t conduct any longer. Contingent upon the kind of sensor and maker, the conductivity conditions may change yet the thought continues as before.

In view of the output of the smoke alarm, a caution framework can be executed.

The sensor utilized in this project is the MQ-2 Gas/Smoke sensor. It is delicate to LPG, Hydrogen, Smoke, Methane, Propane, Alcohol, Butane, and other mechanical burnable gases.

It has two anodes made of Aluminum Oxide (Al2O3) and a warming component made of Tin dioxide (SnO2) which goes about as the principal detecting layer.

Components Required

• MQ-2 Gas Sensor
• LM358 IC
• Resistor (10 KΩ, 330 Ω
• LED
• 0.1µF Ceramic Capacitor
• 10 KΩ Potentiometer