The Flame Detector IR Module is designed to detect the presence of fire or other infrared light sources within the 760nm to 1100nm wavelength range. It utilizes a high-speed, highly sensitive NPN silicon phototransistor and an LM393 comparator to provide both analog and digital outputs. This module is a core component for fire-fighting robots and alarm systems, offering a 60° detection angle for precise source tracking.

Specifications

• Operating Voltage: 3.3V to 5.5V DC.
• Wavelength Detection Range: 760nm to 1100nm.
• Detection Angle: Approximately 60°.
• Comparator IC: LM393 (onboard).
• Outputs: Dual output (Analog and Digital).

Features

• High Sensitivity: The far-infrared probe converts detected light into current changes, which are conditioned by the onboard circuit to trigger a signal.
• Adjustable Threshold: Features a multi-turn potentiometer (variable resistor) to calibrate the sensitivity and set the specific distance/intensity at which the digital output triggers.
• Dual Output Signals:
  • Digital Output (DO): Provides a simple High/Low signal (TTL) when the detected flame exceeds the set threshold.
  • Analog Output (AO): Provides a real-time voltage level corresponding to the intensity of the IR light, ideal for calculating distance or flame size with a microcontroller.
• Stable Operation: Includes onboard capacitors and resistors to filter noise and ensure consistent performance in various environments.

Pin Configuration

• VCC: 3.3V – 5.5V Power Input.
• GND: Ground.
• DO (Digital Output): Interface for digital signals (0 and 1).
• AO (Analog Output): Interface for analog voltage readings.

Common Applications

• Fire-Fighting Robots: Enabling autonomous robots to locate and approach or extinguish fire sources.
• Industrial Safety: Monitoring machinery for overheating or sparks that emit infrared light.
• Fire Alarms: Serving as a primary sensor in DIY fire detection and notification systems.
• Safety Interlocks: Automatically shutting down gas valves or power when a flame is detected in a restricted area.

Usage Tips

• Distance Awareness: The detection range is typically up to 80cm; as the flame gets larger, the detection distance increases.
• Safety Precaution: Keep the sensor probe a safe distance from the actual flame to prevent high temperatures from melting the plastic casing or damaging the phototransistor.
• Sunlight Interference: Since sunlight contains significant infrared light, direct sunlight can cause false triggers. Shield the sensor or adjust the sensitivity if using it in bright environments.
• Calibration: To set the digital trigger point, bring a lighter near the sensor and turn the potentiometer until the onboard status LED just lights up.