Today I am back with another project which is like a fire detector and is very accurate. So, the video for this project is found here:

Diagram (simplified)

This is what the diagram would have looked like in a simple view:

Requirements

There are certain requirements depending on what tools you have. The first one is that your fire sensor must support a digital output. To check if yours does support one, try seeing if yours has a pin that is labeled 'D0'. The second requirement is that you need to have a IR fire sensor. To check if yours is, your fire sensor should not look like that:

Or that:

But it should look something like that:

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EXPANDED TECHNICAL DETAILS

Rapid Thermal Anomaly Detection

A foundational security project that uses both optical and thermal sensors to provide redundant fire detection for home or workshop use.

• Dual-Sensor Fusion Logic: Combines an IR flame sensor with a thermistor or LM35 temperature sensor. The Arduino only triggers a "Critical Alarm" if both sensors show a sudden spike, drastically reducing false alarms from sunlight or heaters.
• 90dB Acoustic Strobe: Pulsates a high-current piezo siren at 2.4kHz, the frequency most likely to wake humans from deep sleep, providing a reliable early warning.

Reliability

• Battery Backup Monitoring: The Arduino monitors the 9V battery voltage; if the power is low, it emits a short "Chirp" every 32 seconds to alert the user.