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Fire Detector

At a glance

Category: Public Safety & Emergency Systems In your kit: ×1 Status: 🚧 Full tutorial coming soon

What it is

An infrared flame-detector module. It has a photodiode tuned to the infrared wavelengths produced by an open flame (around 760–1100 nm). When it sees a flame within about 20–80 cm, its digital output goes LOW.

Fire Detector module

Use a safe flame source

For testing, use a small candle or long lighter held well away from the sensor and any flammable materials. Never use this with a petrol lighter near the ESP32, and always have an adult supervising. This is a learning sensor — not a certified fire-safety device.

What you'll build with it

  • Fire alarm (pairs naturally with the Active Buzzer and an LED)
  • Candle-monitored dinner timer
  • Smart fireplace cutoff (pairs with the Relay to close a fuel valve in a simulation)

This sensor is a good alternative to the PIR-based alarm projects you'll see elsewhere — it triggers on a specific real threat rather than any motion.

Before this page is filled in

See the DHT11 tutorial for the pattern every sensor page follows once complete.