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Reed Switch

Reed Switch

₹48.00Price

🧲 Reed Switch 

📌 Overview

A Reed Switch is a magnetically operated switch that opens or closes in the presence of a magnetic field.

👉 Commonly used in:

  • 🚪 Door/window sensors

  • 🚗 Speed detection

  • 🤖 Robotics

  • 🔐 Security systems

🧠 Working Principle

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

  • When a magnet comes close:

    • Reeds attract each other → circuit closes (ON)

  • When magnet moves away:

    • Reeds separate → circuit opens (OFF)

👉 Based on magnetic attraction (no power needed to operate)

📊 Infographic Summary

┌──────────────────────────────┐
│ 🧲 REED SWITCH │
├──────────────────────────────┤
│ 🎯 Function: Magnetic switch │
│ ⚡ Power: Not required │
│ 🔌 Output: Digital (ON/OFF) │
│ 📦 Type: Normally Open/Closed│
│ 🔁 Operation: Contact-based │
│ 🧠 Trigger: Magnetic field │
└──────────────────────────────┘

🔌 Basic Connection

┌──────────────┐
│ Reed Switch │
├──────────────┤
│ Terminal 1
│ Terminal 2
└──────────────┘

👉 Works like a simple switch
👉 Connect in series with circuit or microcontroller input

⚙️ Types of Reed Switch

  • 🔓 Normally Open (NO)

    • OFF by default, turns ON near magnet

  • 🔒 Normally Closed (NC)

    • ON by default, turns OFF near magnet

  • 🔁 Changeover (SPDT)

    • Switches between two contacts

🌟 Key Features

  • 🧲 Magnetic field detection

  • ⚡ No external power required

  • 🔧 Simple and reliable

  • 📦 Compact and sealed

  • 🔋 Low power consumption

🧪 Applications

  • 🚪 Door/window alarm systems

  • 🚲 Bicycle speedometer

  • 🚗 Wheel rotation sensing

  • 🤖 Robotics limit switches

  • 💡 Proximity detection

  • 🧰 Industrial automation

🔗 Interfacing

Compatible with:

  • 🔵 Arduino

  • 📡 ESP32 / ESP8266

  • 🍓 Raspberry Pi

👉 Connect one terminal to GND, other to digital input (use pull-up resistor)

🔄 Working Example

👉 Door Sensor System:

  • Door closed → magnet near → switch ON

  • Door open → magnet away → switch OFF → alarm triggered

⚠️ Important Notes

  • ⚠️ Fragile (glass enclosure)

  • ⚠️ Limited switching current

  • ⚠️ Can wear out with very frequent switching

  • ⚠️ Sensitive to strong magnetic fields

🆚 Reed Switch vs Hall Effect Sensor

FeatureReed SwitchHall Sensor
OutputMechanical ON/OFFElectronic signal
DurabilityModerateHigh
SpeedSlowerFaster
Power RequirementNoYes

💡 Pro Tip

  • Place magnet very close (few mm) for reliable operation

  • Use with pull-up resistor to avoid floating signals

👉 Perfect for simple, low-cost magnetic detection projects

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