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12mm Reed Switch/Sensor

12mm Reed Switch/Sensor

β‚Ή28.00Price

πŸ“Œ Overview

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

πŸ‘‰ It is one of the simplest and most reliable contactless sensors used in electronics.

🧠 Working Principle

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

  • Normally β†’ contacts are open (NO)

  • When a magnet comes near β†’ reeds attract and touch β†’ circuit closes

  • When magnet is removed β†’ reeds separate again

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

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”‚ 🧲 12mm REED SWITCH SENSOR 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”‚ 🎯 Detects: Magnetic field β”‚
β”‚ ⚑ Voltage: Up to 24V β”‚
β”‚ πŸ”Œ Output: Digital (ON/OFF) β”‚
β”‚ πŸ“ Size: 12mm (glass tube) β”‚
β”‚ 🧠 Type: Magnetic switch β”‚
β”‚ πŸ” Response: Instant 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”‚ Pin 1 β†’ VCC / Signal
β”‚ Pin 2 β†’ GND
β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜

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

βš™οΈ Key Specifications

  • ⚑ Max Voltage: ~24V DC

  • πŸ”Œ Max Current: ~1.2A

  • πŸ“ Size: 12mm length (compact)

  • 🌑 Temperature Range: -50Β°C to 140Β°C

  • πŸ” Life Cycle: ~100,000 operations

  • πŸ“‘ Output: Digital only (ON/OFF)

🌟 Key Features

  • 🧲 Magnetic field detection

  • ⚑ No power needed for basic operation

  • πŸ”§ Very easy to use

  • πŸ’° Extremely low cost

  • πŸ“¦ Small and lightweight

  • πŸ”’ Fully sealed (dust & moisture resistant)

πŸ§ͺ Applications

  • πŸšͺ Door/window security sensors

  • 🚨 Burglar alarm systems

  • πŸ“¦ Position detection (open/close)

  • 🚲 Speed sensors (wheel rotation with magnet)

  • πŸ€– Robotics & automation

  • 🧩 Smart home projects

πŸ”— Interfacing with Microcontrollers

Works with:

  • πŸ”΅ Arduino

  • πŸ“‘ ESP32 / ESP8266

  • πŸ“ Raspberry Pi

πŸ‘‰ 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

πŸ’¬ Real-world insight:

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

πŸ†š 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

πŸ’‘ Pro Tip

For better projects:

  • Use magnet + reed switch for door sensors

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

  • For high durability β†’ consider Hall sensor instead

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