Arduino Flame Sensor Tutorial | Simple Code & Wiring Explained!

Flame sensors are essential components in fire detection systems, making them useful for various DIY projects and safety applications. In this guide, we’ll show you how to test a 4-pin flame sensor module using an Arduino Uno with a simple code to monitor its output in the Serial Monitor.

Flame sensor with Arduino UNO

Understanding the 4-Pin Flame Sensor

The 4-pin flame sensor detects infrared light in the 760nm to 1100nm range, making it ideal for detecting fire or high-heat sources. It features:

Flame sensor specifications

Step-by-Step Instructions

Step 1: Components Required

To follow along with the tutorial, you'll need:

Components required for this tutorial

✅ Arduino UNO board

✅ 4-Pin Flame Sensor Module

✅ Jumper Wires

✅ USB cable for Arduino

Step 2: Setting Up the Circuit

Proper wiring is crucial for accurate readings. Follow these connections:

Connection flame sensor

The connection between the flame sensor and Arduino

Wiring diagram

✅VCC → 5V (Arduino)

✅GND → GND (Arduino)

✅A0 → A0 (Arduino) (for analog readings)

✅D0 → D2 (Arduino) (for digital output)

Once connected, plug in the USB cable to the Arduino. The PWR LED on the Arduino and flame sensor should light up, indicating power.

Step 3: Programming the Arduino

Using the Arduino IDE, you can write a simple program to control the servo motor or you can download the code HERE.

int flameAnalog = A0;
int flameDigital = 2;

void setup() {
    Serial.begin(9600);
    pinMode(flameDigital, INPUT);
}

void loop() {
    int analogValue = analogRead(flameAnalog);
    int digitalValue = digitalRead(flameDigital);
    
    Serial.print("Analog Value: ");
    Serial.print(analogValue);
    Serial.print(" | Digital Value: ");
    Serial.println(digitalValue);
    
    delay(500);
}

Open Arduino IDE and copy-paste the code

Step 4: Expected Output

After uploading the code to your Arduino, open the Serial Monitor in the Arduino IDE. Bring a flame source, such as a lighter or matchstick, near the sensor. 

When no flame is detected, the sensor will produce high analog values and a digital output of 1. 

When a flame is near, the analog value decreases, and the digital output changes to 0.

Troubleshooting Tips

• If the sensor doesn’t detect flames, adjust the potentiometer to fine-tune sensitivity.

• Ensure correct wiring and that the module is powered.

• Try using different flame sources like a candle or matchstick.

Conclusion

Testing a 4-pin flame sensor with Arduino is simple and useful for fire detection projects. By following this guide, you can integrate the sensor into alarms, security systems, or automated responses. Try it out and let us know your results! 🔥🚀

Tools and components

Shopee:

1. Flame Sensor
2. Jumper Wire
3. UNO R3
4. USB Cable

Lazada:

1. Flame Sensor
2. Jumper Wire
3. UNO R3
4. USB Cable

Aliexpress:

1. Flame Sensor
2. Jumper Wire
3. UNO R3
4. USB Cable

Video

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#Arduino #FlameSensor #FireDetection #DIYTech #EmbeddedSystems