5V Flame Detection & Relay Control Module

Description

Description

The 5V Flame Detection & Relay Control Module is an all-in-one fire detection and response solution that combines an infrared flame sensor with a powerful relay output on a single compact board. Unlike separate sensor and relay modules that require additional wiring and programming, this integrated module provides a complete “detect and act” system — when a flame is detected, the relay automatically activates, allowing you to directly control alarms, water sprinklers, exhaust fans, or any other high-power AC or DC equipment.

The module uses an infrared-sensitive phototransistor that detects flames and light sources within the 760nm to 1100nm wavelength range — the typical spectral signature of open flames from hydrocarbon fuels such as gas, oil, candles, and lighters. It can reliably detect a lighter flame from up to 80cm (31 inches) away, with larger flames detectable at even greater distances. The detection angle is approximately 60 degrees, providing a useful field of view for monitoring an area.

Key features include an onboard LM393 comparator with a blue potentiometer for adjustable sensitivity, allowing you to set the exact flame intensity threshold that triggers the relay. The relay provides SPDT (Single Pole Double Throw) contacts rated for 10A at 250V AC or 30V DC, making it capable of switching most common loads directly without external contactors.

This module is ideal for fire alarm systems, kitchen fire suppression, industrial safety monitoring, educational robotics, and any application where automatic response to flame presence is required. It operates directly from a 5V power supply (USB, Arduino, or dedicated adapter) and requires no microcontroller for basic operation — though it can easily be interfaced with one if more complex logic is needed.

Features

• Integrated flame sensor and relay on a single PCB

• Detects flame wavelengths: 760nm – 1100nm (infrared range)

• Detection distance: up to 80cm for lighter flame (larger flames detectable further)

• Detection angle: approximately 60 degrees

• Adjustable sensitivity via onboard blue potentiometer

• Onboard LM393 comparator for reliable threshold detection

• Relay directly triggered by comparator output (no MCU required)

• SPDT relay contacts: NO (Normally Open), NC (Normally Closed), COM (Common)

• LED indicator shows relay activation status

• Compact size with mounting holes for easy installation

• Screw terminal blocks for convenient wiring

Technical Parameters