Скачать или смотреть 🌧️How to Make a Rain Sensor Alarm at Home

🌧️💡 DIY Rain Detector Alarm — Buzzer + LED Alert | Simple Electronics Project 🔔⚡

In this video, I will show you how to make a simple rain alarm circuit that activates both a buzzer and an LED whenever it detects rain or water droplets. This easy project is built using only one BC547 NPN transistor, two 100Ω resistors, a 4V battery, and a basic rain sensor made from two metal wires.

💧 How it Works:
When rainwater touches the sensor wires, it completes a small conductive path. This tiny current is enough to switch ON the BC547 transistor, which then allows current to flow to both the buzzer and LED. The buzzer makes a loud sound 🔊 to instantly alert you, while the LED 💡 gives a visual warning. Once the rain stops and the water dries off, the circuit automatically turns off.

⚙️ Components Used:

BC547 NPN Transistor

2 × 100Ω Resistors

4V Battery

Buzzer 🔔

LED 💡

2 Metal Wires (Rain Sensor)

Breadboard or PCB (optional)

📌 Features:
✅ Very low cost and beginner-friendly
✅ Works on low voltage (safe to use)
✅ Can be used for rain alerts, water leakage alarms, or garden automation
✅ No microcontroller required
✅ Easy to modify for different voltages or sensors

💡 Applications:

Automatic window closing alerts 🚪

Water leakage detection in homes 🏠

Garden watering alerts 🌱

Safety alarm for outdoor electronics ⚡

🎯 This project is perfect for students, beginners, and hobbyists who want to learn the basics of transistor switching and water detection. You can build it in less than 15 minutes with just a few electronic components.


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