Digital Magnetic Reed Switch Sensor Module for Arduino & Micro:bit

Upgrade your interface with crisp visuals.
This 12864 Graphic LCD Module delivers a sharp 128x64 pixel resolution on a stunning blue backlight with white pixels. Built with the versatile ST7920 controller, it supports both Parallel and SPI Serial modes, allowing you to save precious I/O pins on your Arduino or microcontroller. Perfect for displaying complex graphics, charts, and custom text.

• High-Res Graphic Display: 128x64 dot matrix resolution enables text, images, and graph rendering.
• Crisp Visibility: Deep blue background with bright white pixels provides excellent contrast and aesthetics.
• Dual Interface Modes: Supports both 6800 8-bit Parallel and Serial (SPI) modes (Selectable via Pin 15 PSB).
• Standard 5V Logic: Seamlessly compatible with Arduino UNO, Mega, and other 5V logic controllers.
• Adjustable Contrast: Dedicated V0 pin allows for precise brightness and contrast tuning via potentiometer.
• Robust Mounting: Four corner mounting holes (3mm) for secure installation in enclosures.

Reliable Magnetic Sensing Made Simple

Whether you are building a smart security system for your home or teaching a classroom of students about electromagnetism, the Keyes Digital Reed Switch Sensor Module is the essential component you need. Unlike raw glass reed switches that are fragile and hard to solder, this module comes pre-mounted on a durable PCB with all necessary circuitry included.

How It Works

At the heart of this module is the MKA10110 Green Reed Switch. Inside the sealed glass tube are two ferrous elastic reeds separated by a small gap. When a magnet approaches, the magnetic field lines magnetize the reeds, causing them to attract and touch. This closes the circuit (Signal goes High/Low depending on logic), lighting up the on-board LED and sending a digital signal to your microcontroller. When the magnet moves away, the reeds spring apart, breaking the circuit.

Built for Makers and Educators

We understand the frustration of confusing wiring. That’s why this module features a 3-pin anti-reverse interface. The included custom wire ensures you never plug it in backwards, protecting your sensor and your mainboard. It operates seamlessly between 3.3V and 5V, making it universally compatible with most modern development boards.

Common Applications

• Smart Home Security: Detect if windows or doors are opened.
• Position Sensing: Use as a limit switch for CNC machines or 3D printers.
• Speed Detection: Calculate RPM by attaching a magnet to a rotating wheel.
• Interactive Art: Trigger lights or sounds when an object is placed correctly.

• Local delivery within Hong Kong and in-store pickup.​
• Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.​
• Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).​
• Estimated delivery time: 1–3 business days after dispatch (Hong Kong).​
• In-store pickup details (location and time) will be confirmed by email or phone message.​
• Delivery times are estimates and may be affected by weather or unforeseen circumstances.​