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Reed Switch

Reed Switch

β‚Ή48.00Price

🧲 Reed Switch 

πŸ“Œ Overview

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

πŸ‘‰ Commonly used in:

  • πŸšͺ Door/window sensors

  • πŸš— Speed detection

  • πŸ€– Robotics

  • πŸ” Security systems

🧠 Working Principle

  • Inside the switch β†’ two thin ferromagnetic metal reeds sealed in a glass tube

  • When a magnet comes close:

    • Reeds attract each other β†’ circuit closes (ON)

  • When magnet moves away:

    • Reeds separate β†’ circuit opens (OFF)

πŸ‘‰ Based on magnetic attraction (no power needed to operate)

πŸ“Š Infographic Summary

β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
β”‚ 🧲 REED SWITCH β”‚
β”œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€
β”‚ 🎯 Function: Magnetic switch β”‚
β”‚ ⚑ Power: Not required β”‚
β”‚ πŸ”Œ Output: Digital (ON/OFF) β”‚
β”‚ πŸ“¦ Type: Normally Open/Closedβ”‚
β”‚ πŸ” Operation: Contact-based β”‚
β”‚ 🧠 Trigger: Magnetic field β”‚
β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜

πŸ”Œ Basic Connection

β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
β”‚ Reed Switch β”‚
β”œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€
β”‚ Terminal 1
β”‚ Terminal 2
β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜

πŸ‘‰ Works like a simple switch
πŸ‘‰ Connect in series with circuit or microcontroller input

βš™οΈ Types of Reed Switch

  • πŸ”“ Normally Open (NO)

    • OFF by default, turns ON near magnet

  • πŸ”’ Normally Closed (NC)

    • ON by default, turns OFF near magnet

  • πŸ” Changeover (SPDT)

    • Switches between two contacts

🌟 Key Features

  • 🧲 Magnetic field detection

  • ⚑ No external power required

  • πŸ”§ Simple and reliable

  • πŸ“¦ Compact and sealed

  • πŸ”‹ Low power consumption

πŸ§ͺ Applications

  • πŸšͺ Door/window alarm systems

  • 🚲 Bicycle speedometer

  • πŸš— Wheel rotation sensing

  • πŸ€– Robotics limit switches

  • πŸ’‘ Proximity detection

  • 🧰 Industrial automation

πŸ”— Interfacing

Compatible with:

  • πŸ”΅ Arduino

  • πŸ“‘ ESP32 / ESP8266

  • πŸ“ Raspberry Pi

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

πŸ”„ Working Example

πŸ‘‰ Door Sensor System:

  • Door closed β†’ magnet near β†’ switch ON

  • Door open β†’ magnet away β†’ switch OFF β†’ alarm triggered

⚠️ Important Notes

  • ⚠️ Fragile (glass enclosure)

  • ⚠️ Limited switching current

  • ⚠️ Can wear out with very frequent switching

  • ⚠️ Sensitive to strong magnetic fields

πŸ†š Reed Switch vs Hall Effect Sensor

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

πŸ’‘ Pro Tip

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

  • Use with pull-up resistor to avoid floating signals

πŸ‘‰ Perfect for simple, low-cost magnetic detection projects

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