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Reed Switch Module-DIgital and Analog Output (KY-025)

SKU: D0DDOWAKRI
★★★★ ★ ★
4.7 (56 reviews)
The KY-025 Reed Switch Module is a magnetic field detection module designed to sense the presence or absence of a magnet using a normally open reed switch. The module integrates a sealed glass reed switch with an LM393 comparator, providing both analog (AO) and digital (DO) outputs for flexible interfacing with microcontrollers. When a magnetic field is brought near the...
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The KY-025 Reed Switch Module is a magnetic field detection module designed to sense the presence or absence of a magnet using a normally open reed switch. The module integrates a sealed glass reed switch with an LM393 comparator, providing both analog (AO) and digital (DO) outputs for flexible interfacing with microcontrollers.

When a magnetic field is brought near the sensor, the reed switch closes, changing the output state. The onboard potentiometer allows users to adjust the trigger threshold for the digital output, while the analog output provides the direct sensor signal. This makes the module ideal for door and window sensors, security systems, position detection, proximity sensing, industrial automation, and robotics applications.

The KY-025 is fully compatible with Arduino, ESP32, STM32, Raspberry Pi Pico, AVR, PIC, and other microcontroller platforms, making it an excellent choice for magnetic sensing and automation projects.

Key Features

  • High-quality reed switch magnetic sensor
  • Analog and digital output signals
  • Built-in LM393 comparator
  • Adjustable digital trigger threshold
  • Detects the presence of magnetic fields
  • Normally open reed switch design
  • Fast response time
  • Low power consumption
  • Compact PCB module design
  • Onboard power and status indicator LEDs
  • Easy microcontroller interfacing
  • Compatible with Arduino, ESP32, STM32, and Raspberry Pi
  • Suitable for security and automation applications
  • Ideal for educational and DIY electronics projects

Shipping & Returns

Orders placed before 3 PM IST will be shipped on the same day (excluding Sundays and Public holidays) through our shipping partners. In rare cases, the pickup may get delayed during Public holidays / Bandh / Environmental disturbances.

Specifications

Specifications:

Module Type: Reed Switch Magnetic Sensor Module
Model: KY-025
Sensor Type: Normally Open Reed Switch
Detection Principle: Magnetic Field Detection
Comparator IC: LM393
Operating Voltage: 3.3V to 5V DC
Operating Current: Less Than 15mA
Output Type: Analog Output (AO) and Digital Output (DO)
Digital Output Logic: TTL Compatible
Detection Method: Magnetic Contact Switching
Detection Distance: Approximately 10mm to 30mm (Depends on Magnet Strength)
Sensitivity Adjustment: Onboard Multi-turn Potentiometer
Switch Type: Normally Open (NO) Reed Switch
Response Time: Fast Response
Indicator LEDs: Power LED and Detection LED
Interface Pins: VCC, GND, AO, DO
Operating Temperature: -20°C to +70°C
Storage Temperature: -40°C to +85°C
PCB Dimensions: Approximately 36mm × 15mm × 14mm
Mounting Type: Through-Hole Module
Compatibility: Arduino, ESP32, STM32, Raspberry Pi Pico, AVR, PIC

Additional Resources

Reed Switch.PDF

FAQ

1. What is the KY-025 Reed Switch Module used for?

The KY-025 is used to detect the presence of a magnet and is commonly used in door and window alarms, position sensing, robotics, industrial automation, and smart home applications.

2. What outputs does the KY-025 provide?

The module provides an analog output (AO) for the direct sensor signal and a digital output (DO) that changes state when the magnetic field exceeds the threshold set by the onboard potentiometer.

3. What is the purpose of the onboard potentiometer?

The potentiometer adjusts the switching threshold for the digital output, allowing the trigger point to be tuned for different magnets and operating conditions.

4. Can the KY-025 be connected to Arduino and ESP32 boards?

Yes, the module operates from 3.3V to 5V and can be directly connected to Arduino, ESP32, STM32, Raspberry Pi Pico, and other compatible microcontrollers.

5. What is the typical detection range of the KY-025?

The detection distance is typically 10mm to 30mm, depending on the size, strength, and orientation of the magnet used.