A Fire alarm is a simple electronic circuit that determines the presence of any hazardous fire in its vicinity & triggers an array of preventive measures such as overhead sprinklers or an alarming array. Fire alarms are an integral safety feature in today's industry, with the government requiring mandatory fire safety SOPs & fire alarm systems for every existing industry. So, in this tutorial, we will go through a step-by-step procedure on how to make a simple fire alarm circuit using a thermistor.

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Hardware  Components

Circuit Diagram

Working Explanation

The working of this circuit is pretty simple. On powering up the circuit and bringing a heating element close to it, the temperature around the thermistor begins to increase. Subsequently, the resistance of the thermistor decreases Due to which the output voltage of the voltage divider increases.