top of page
12mm Reed Switch/Sensor

12mm Reed Switch/Sensor

₹28.00Price

📌 Overview

A 12mm Reed Switch Sensor is a magnetic switch that detects the presence of a magnet and changes its state (ON/OFF).

👉 It is one of the simplest and most reliable contactless sensors used in electronics.

🧠 Working Principle

  • Inside the sensor → two thin metal reeds sealed in a glass tube

  • Normally → contacts are open (NO)

  • When a magnet comes near → reeds attract and touch → circuit closes

  • When magnet is removed → reeds separate again

✔ Works purely on magnetic field (no power needed for basic switch)

📊 Infographic Summary

┌──────────────────────────────┐
│ 🧲 12mm REED SWITCH SENSOR │
├──────────────────────────────┤
│ 🎯 Detects: Magnetic field │
│ ⚡ Voltage: Up to 24V │
│ 🔌 Output: Digital (ON/OFF) │
│ 📏 Size: 12mm (glass tube) │
│ 🧠 Type: Magnetic switch │
│ 🔁 Response: Instant │
└──────────────────────────────┘

🔌 Basic Connection

┌──────────────┐
│ Reed Switch │
├──────────────┤
│ Pin 1 → VCC / Signal
│ Pin 2 → GND
└──────────────┘

👉 Acts like a simple switch, so you can use it directly or with a pull-up resistor.

⚙️ Key Specifications

  • ⚡ Max Voltage: ~24V DC

  • 🔌 Max Current: ~1.2A

  • 📏 Size: 12mm length (compact)

  • 🌡 Temperature Range: -50°C to 140°C

  • 🔁 Life Cycle: ~100,000 operations

  • 📡 Output: Digital only (ON/OFF)

🌟 Key Features

  • 🧲 Magnetic field detection

  • ⚡ No power needed for basic operation

  • 🔧 Very easy to use

  • 💰 Extremely low cost

  • 📦 Small and lightweight

  • 🔒 Fully sealed (dust & moisture resistant)

🧪 Applications

  • 🚪 Door/window security sensors

  • 🚨 Burglar alarm systems

  • 📦 Position detection (open/close)

  • 🚲 Speed sensors (wheel rotation with magnet)

  • 🤖 Robotics & automation

  • 🧩 Smart home projects

🔗 Interfacing with Microcontrollers

Works with:

  • 🔵 Arduino

  • 📡 ESP32 / ESP8266

  • 🍓 Raspberry Pi

👉 Use digital input pin to detect state change.

⚠️ Important Notes

  • ⚠️ Fragile (glass body – handle carefully)

  • ⚠️ Requires a magnet to operate

  • ⚠️ Limited switching current (use relay for high loads)

  • ⚠️ Sensitive to strong magnetic interference

💬 Real-world insight:

Reed switches are simple but can wear out if switching high current frequently (arcing effect).

🆚 Reed Switch vs Hall Effect Sensor

FeatureReed SwitchHall Sensor
OutputDigital (ON/OFF)Analog/Digital
Power RequiredNo (passive)Yes
DurabilityMechanical wearNo moving parts
CostVery cheapSlightly higher

💡 Pro Tip

For better projects:

  • Use magnet + reed switch for door sensors

  • Add pull-up resistor (10kΩ) for stable readings

  • For high durability → consider Hall sensor instead

Quantity
bottom of page