Simple Fire Alarm Circuits at Low Cost

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Simple Fire Alarm Circuits at Low Cost

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Description

Simple Fire Alarm Circuits at Low Cost

Introduction

Fire Alarm Circuit is a simple circuit that detects the fire and activates the Siren Sound or Buzzer. Fire Alarm Circuits are very important devices to detect fire in the right time and prevent any damage to people or property.Fire Alarm Circuits and Smoke Sensors are a part of the security systems which help in detecting or preventing damage. Installing Fire Alarm Systems and Smoke Sensors in commercial buildings like offices, movie theatres, shopping malls and other public places is compulsory.

Circuit

  • The design of the Fire Alarm Circuit with Siren Sound is very simple. First, connect the 10 KΩ Potentiometer to the inverting terminal of the LM358 Op – Amp. One end of the POT is connected to +5V, other end is connected to GND and the wiper terminal is connected to Pin 2 of Op – Amp.
  • We will now make a potential divider using 10 K Thermistor and 10 KΩ Resistor. The output of this potential divider i.e. the junction point is connected to the non – inverting input of the LM358 Operational Amplifier.
  • We have chosen a small, 5V buzzer in this project to make the alarm or siren sound. So, connect the output of the LM358 Op – amp to the 5V Buzzer directly.
  • Pins 8 and 4 of the LM358 IC i.e. V+ and GND are connected to +5V and GND respectively.

Working

  • We will now see the working of the simple Fire Alarm Circuit. First thing to know is that the main component in detecting the fire is the 10 K Thermistor. As we mentioned in the component description, the 10 K Thermistor used here is a NTC type Thermistor.
  • If the temperature increases, the resistance of the Thermistor decreases.
  • In case of fire, the temperature increases. This increase in temperature will reduce the resistance of the 10 K Thermistor.
  • As the resistance decreases, the output of the voltage divider will increase.
  • Since the output of the voltage divider is given to the non – inverting input of the LM358 Op – Amp, its value will become more than that of the inverting input.
  • As a result, the output of the Op – Amp becomes high and it activates the buzzer.

Applications

  • Fire Alarm Circuits are very useful in homes, offices, schools, labs, etc. to detect and prevent any disasters due to fire.
  • Fire Alarm Systems can work as a stand – alone devices or be a part of a complex home security system with other security features like smoke detection, intruder alert, motion detection, etc.

 

Additional information

Weight 1.000000 kg

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