4Pin KY-026 Flame Sensor Module
🔥 KY-026 Flame Sensor Module (4-Pin)
Fire Detection Sensor • Infrared Flame Detection • Safety & Robotics Projects
The KY‑026 Flame Sensor Module is a flame detection module designed to sense fire or flame sources using infrared light. It detects light wavelengths in the range of 760 nm – 1100 nm, which are typically emitted by flames.
This module provides both analog and digital outputs, allowing it to be used for fire detection systems, safety alarms, and robotics projects.
📊 Infographic Overview
🔹 Basic Specifications
| Feature | Details |
|---|---|
| 🔥 Detection Type | Infrared Flame Detection |
| 🔌 Operating Voltage | 3.3V – 5V |
| 📡 Output Type | Analog (A0) & Digital (D0) |
| 📏 Detection Angle | ~60° |
| 🔍 Detection Distance | Up to ~1 meter |
| ⚙ Sensitivity Adjustment | Yes (Potentiometer) |
🧩 Main Components
| Component | Description |
|---|---|
| 🔥 Flame Sensor Diode | Detects infrared light from flames |
| ⚙ Comparator IC (LM393) | Converts analog signal into digital output |
| 🎚 Sensitivity Potentiometer | Adjusts flame detection sensitivity |
| 💡 Indicator LEDs | Shows power and detection status |
🔌 Pin Configuration
| Pin | Function |
|---|---|
| VCC | Power supply (3.3V–5V) |
| GND | Ground |
| A0 | Analog output |
| D0 | Digital output |
⚙️ Working Principle
The module detects flames using infrared radiation sensing.
Step-by-Step Operation
1️⃣ Flames emit infrared radiation in specific wavelengths.
2️⃣ The flame sensor diode detects this infrared light.
3️⃣ The signal is converted into an analog voltage.
4️⃣ The comparator circuit checks if the signal exceeds the threshold.
5️⃣ If detected, the module outputs a digital HIGH/LOW signal.
📐 Sensor Detection Diagram
Flame Source
🔥
│
▼
Infrared Radiation
│
▼
KY-026 Flame Sensor
(IR Detection)
│
▼
Analog / Digital Output
│
▼
Microcontroller
🤖 Common Applications
🔥 Fire detection and alarm systems
🏠 Home safety monitoring
🤖 Fire-fighting robots
🏭 Industrial flame monitoring
📡 Smart IoT safety devices
🔌 Compatible Microcontrollers
The module easily interfaces with:
Arduino Uno
Arduino Nano
ESP32
Raspberry Pi
📊 KY-026 vs KY-003 Flame Sensor
| Feature | KY-026 | KY-003 |
|---|---|---|
| Output | Analog + Digital | Digital only |
| Sensitivity Control | Yes | No |
| Applications | Advanced detection | Basic flame sensing |
💡 Advantages
✅ Fast flame detection
✅ Adjustable sensitivity
✅ Analog and digital output options
✅ Compact and low-cost module
✅ Easy integration with microcontrollers
⚠️ Limitations
❌ Limited detection range
❌ Strong sunlight may affect readings
❌ Detects flame light, not heat
🔧 Example DIY Project
🔥 Fire Detection Alarm System
Components
KY‑026 Flame Sensor Module
Arduino Uno
Buzzer module
LED indicator
Working
✔ Sensor detects flame presence
✔ Arduino receives the signal
✔ Buzzer alarm activates to alert about fire
