π₯ Fire Detector Alarm using BC547 Transistor β DIY Electronics Project
Project Level: Beginner
Estimated Time: 30β45 mins
Main Components: BC547, Flame Sensor, Buzzer, Resistor, LED
π§ Introduction
Early fire detection is crucial in both homes and industries. In this DIY project, youβll build a simple and affordable Fire Detector Alarm using a BC547 transistor and a Infrared receiver led. It's a perfect beginner electronics project for students, hobbyists, and science fair participants.
π§° Components Required
| Component | Quantity |
|---|---|
| Infrared receiver led | 1 |
| BC547 Transistor | 1 |
| Buzzer (5V) | 1 |
| Red LED | 1 |
| 220Ξ© Resistor | 1 |
| Breadboard or PCB | 1 |
| Jumper Wires | As required |
| Power Supply (5V or 9V battery + regulator) | 1 |
βοΈ Circuit Diagram
- Connect the flame sensor output to the base of BC547.
- Connect the emitter to ground.
- Connect the collector to the negative pin of the buzzer and LED.
- Positive ends of the buzzer and LED go to the +5V supply through a 220Ξ© resistor.
- When flame is detected, the sensor triggers the transistor, activating the buzzer and LED.
π§ Working Principle
- The flame sensor detects infrared radiation from a fire.
- It sends a LOW signal to the base of the BC547 transistor.
- The transistor switches ON, completing the circuit and turning ON the buzzer and LED.
- When no flame is present, the transistor remains OFF.
π Applications
- Fire alarm systems in homes, offices, or schools
- Mini engineering and diploma projects
- Educational kits for STEM learning
- Portable fire alert systems
π‘ Tips for Beginners
- You can test the circuit using a lighter (keep it at a safe distance).
- Use a casing if you plan to install it permanently.
- Replace the flame sensor with other sensors like MQ2 (smoke sensor) for more accuracy.
π¦ Want to Buy this Kit?
π Buy Now β Fire Detector Alarm Kit on CircuitRanger.in
Includes all components + tutorial PDF + bonus resistor pack!
π₯ Free Download
π Click here to download PDF tutorial with circuit diagram