Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	3.3V - 5V DC
Output Type	Digital Switch (NO/NC)
Detection Distance	Approx. 15mm
Indicator LED	Yes, Power and Signal
Mounting Hole Diameter	3.1 mm
PCB Dimensions	32mm x 14mm
Connector Type	3-Pin PH2.0 Header
Material	FR-4 PCB, Glass Reed Switch
Compatibility	Arduino, Raspberry Pi, ESP32
Package Includes	1x Sensor Module, 1x Magnet

6 reviews

Anonymous

Mar 31, 2026

Rating: 4/5

Good value, works as expected

The sensor responds quickly when the magnet is moved away. The only reason I didn't give 5 stars is that the included magnet is quite small, but it works fine for thin doors.

Anonymous

Mar 27, 2026

Rating: 5/5

Easy to integrate

Plug and play with standard microcontrollers. The logic is straightforward: HIGH when closed, LOW when open (or vice versa depending on wiring). Great for learning interrupts.

Anonymous

Mar 26, 2026

Rating: 5/5

Perfect for home security projects

I used this module to build a simple door alarm system with my Arduino. The detection range is consistent, and the LED indicators make debugging very easy. Highly recommended for beginners.

Anonymous

Mar 18, 2026

Rating: 4/5

Solid component for classrooms

Bought a batch for our student workshop. Most students got them working immediately. One unit had a slightly loose header pin, but nothing a little solder couldn't fix.

Anonymous

Mar 13, 2026

Rating: 5/5

Exceeded expectations

Very sensitive and accurate. I'm using it to detect when a drawer is opened in my smart cabinet project. The form factor is compact enough to hide easily.

Anonymous

Mar 12, 2026

Rating: 5/5

Reliable and sturdy

Been using this in a prototype for a window sensor for two weeks now. No false triggers yet. The soldering points are clear and easy to work with if you need to add wires.

5 FAQ

Q: Can this be used directly with a 3.3V ESP8266?

A: Absolutely. The module operates comfortably within the 3.3V to 5V range, making it fully compatible with ESP8266 and ESP32 boards.

Q: What is the maximum current this switch can handle?

A: The reed switch itself is rated for low signal currents (typically up to 500mA), but we recommend using it for logic signals rather than driving high-power loads directly.

Q: Is the output normally open or normally closed?

A: This specific module uses a Normally Open (NO) reed switch configuration. The circuit closes when the magnet is near.

Q: Does this module come with the magnet needed to trigger it?

A: Yes, each package includes one small block magnet specifically paired with the reed switch.

Q: How do I mount this on a plastic enclosure?

A: You can use the two pre-drilled 3.1mm holes with small screws or double-sided adhesive tape. Ensure the magnet aligns parallel to the sensor for best results.

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