LM393 Magnetic Reed Switch Sensor Module (3.3V-5V) Digital Output
LM393 Magnetic Reed Switch Sensor Module (3.3V-5V) Digital Output
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Short Product Description
Short Product Description
This LM393 Magnetic Reed Switch Sensor Module detects magnetic fields to trigger a precise digital output. Operating on 3.3V to 5V, it features a normally open reed tube and an onboard LM393 comparator delivering a clean signal with over 15mA driving capability. Ideal for Arduino DIY projects, it is commonly used for building custom door/window alarms, limit switches, and relay controls.
Key Features
Key Features
- Normally Open Reed Switch: Detects magnetic fields within 1.5cm to accurately trigger circuit changes.
- LM393 Comparator: Provides a clean, stable digital switching output (0 and 1) with a good waveform.
- High Driving Capability: Delivers over 15mA of current, allowing direct connection to microcontrollers or relays.
- Dual LED Indicators: Features onboard LEDs for power supply (PWR-LED) and digital output status (DO-LED).
- Easy Installation: The compact 31.3mm x 14.1mm PCB includes a fixed bolt hole for secure mounting in custom enclosures.
Full Product Description
Full Product Description
Reliable Magnetic Detection for DIY Electronics
This sensor module utilizes a normally open reed tube to detect the presence of a magnetic field within a 1.5cm range. When a magnet approaches, the reed switch closes, and the module outputs a low-level digital signal. It is an excellent, easy-to-use component for building custom door sensors, window alarms, or interactive Arduino and Raspberry Pi projects.
Clean Signal Output with LM393 Comparator
The onboard LM393 voltage comparator ensures the digital output signal is clean, stable, and features an excellent waveform. With a driving ability exceeding 15mA, the digital output (DO) pin can directly interface with microcontrollers or drive a relay module to control higher voltage circuits without requiring additional amplification.
Technician Tip
Always double-check your wiring before applying power, as reversing the VCC and GND connections will permanently damage the LM393 chip. The technical team at Sun Cheong Computer Co. Ltd. recommends keeping your triggering magnet within 1.5cm of the glass reed tube for reliable activation, as distances beyond this may result in missed triggers or insensitive operation.
Technical Specifications
Technical Specifications
- Operating Voltage: 3.3V - 5V DC
- Comparator Chip: LM393
- Sensor Type: Normally Open (NO) Reed Tube
- Output Type: Digital Switching Output (0 and 1)
- Driving Ability: >15mA
- Induction Distance: Within 1.5cm
- Dimensions (L x W): 31.3mm x 14.1mm (PCB size: 3.2cm x 1.4cm)
- Weight: 2.2g
Delivery Options
Delivery Options
- 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.
FAQ Section
FAQ Section
- Can I connect this sensor directly to a Raspberry Pi or Arduino?Yes, the digital output (DO) pin can be connected directly to the I/O ports of 3.3V or 5V microcontrollers like Arduino and Raspberry Pi.
- What happens when a magnet is brought close to the sensor?When a magnet is within 1.5cm, the reed switch conducts, the DO-LED turns on, and the module outputs a low-level digital signal.
- Does this module output an analog signal?No, this specific module only provides a digital switching output (0 and 1) via the LM393 comparator.
- Can this sensor directly control a high-voltage appliance?No, but you can connect the digital output to a relay module, which can then safely switch high-voltage appliances like lamps or motors.
- Can I buy the required magnets at your Sham Shui Po store?Yes, we stock various small neodymium magnets suitable for triggering these reed switches at our Sham Shui Po retail shop.
Target Users / Applications
Target Users / Applications
- Arduino and STEM students building custom door or window security alarms.
- Makers designing limit switches for 3D printers, CNC machines, or robotics.
- DIY smart home enthusiasts integrating magnetic sensors into program-controlled switches.
- Hobbyists building electronic weighing instruments, level meters, or water meters requiring magnetic triggers.
