The Hall Effect Unit is a compact, high-precision magnetic sensing module designed to detect the presence, polarity, and strength of magnetic fields in smart electronics applications. Centered around the highly reliable A3144E unipolar Hall-effect switch IC, it utilizes advanced semiconductor technology to trigger a clean digital output whenever a magnetic south pole approaches its sensing face. This module eliminates mechanical wear completely, providing a high-speed, wear-free alternative to traditional reed switches. Built with integrated status indicators, Grove-compatible port interfaces, and an optimized low-power blueprint, it serves as a dependable, zero-fuss sensing anchor for proximity detection, speed tachometers, and safety limit switches.
Overview:
The Hall Effect Unit offers an accessible and highly versatile magnetic proximity solution for makers, hobbyists, and rapid prototyping applications. Traditional mechanical limit switches suffer from structural contact fatigue, fluid vulnerability, and slow mechanical response cycles over time; this solid-state switching module operates entirely without physical contact, ensuring consistent trigger cycles. The module outputs a default HIGH signal when no magnetic field is present, dropping sharply to a clean LOW digital state when a threshold magnetic south pole moves within sensing range. Outfitted with a standard Grove-compatible 4-pin interface, it handles instant plug-and-play connections to microcontrollers like Arduino, ESP32, or M5Stack core controllers without requiring complex pull-up resistor networks. Whether you are building an automated door security log, a brushless motor speed counter, or a non-contact industrial end-stop tracker, this compact sensor ensures stable, debounced digital feedback.
Features:
- A3144E Solid-State Sensing Core: Outfitted with a premium, unipolar Hall-effect IC for reliable, high-speed magnetic threshold detection.
- Grove-Compatible Plug-and-Play Interface: Standard 4-pin connection architecture guarantees direct integration with development host boards without soldering lines.
- Integrated Visual Status LED: Features an on-board indicator light that illuminates instantly when a magnetic field triggers the sensor, simplifying rapid troubleshooting.
- High-Speed Digital Output: Delivers clean, debounced square-wave output transitions perfectly optimized for high-RPM tachometers and counting loops.
- Solid-State Non-Contact Operation: Eliminates physical contact limits, delivering a high operational lifespan immune to mechanical dust or humidity wear.
- Wide Supply Voltage Range: Operates efficiently across 3.3V to 5V power rails, matching both low-voltage ESP32 logic and standard 5V microcontroller setups.
- Built-In Internal Pull-Up Resistor: Simplifies your physical hardware layout by establishing stable signal lines directly out of the box.
- Lego-Compatible Mechanical Mounts: Housed in a standardized enclosure featuring dual structural mounting holes for secure anchoring into hobby builds.
Specification:
- Module Type: Unipolar Magnetic Hall Effect Sensor Switch
- Core Sensor IC: Allegro MicroSystems A3144E
- Input Voltage Range: 3.3V to 5V DC
- Output Signal Type: Digital Level (Default HIGH / Active LOW upon detection)
- Magnetic Sensitivity Threshold: Unipolar (Responds to the South Pole of a magnet)
- Sensing Distance Parameters: Dependent on target magnet strength (Typically 5mm to 20mm)
- Power Consumption Current: ~5mA under continuous execution
- Connection Port Style: 4-Pin Grove Universal Connector (HY2.0-4P Layout)
- Enclosure Shell Compound: High-impact Plastic (ABS / PC structural compound)
- Dimensions Profile: Approximately 32mm × 24mm × 12mm
- Net Component Weight: ~4.0 g
High-Speed Wear-Free Proximity Sensing
Take full control of your automated state tracking without expanding mechanical footprint limitations. By shifting away from physical lever buttons to this solid-state unipolar sensing unit, your automation loop monitors positions seamlessly through solid enclosure walls or acrylic barriers, speeding up your rapid prototyping assembly chains.
Optimized for Multi-Platform Project Development
— Engineering focused on cross-platform versatility. The multi-voltage 3.3V/5V configuration lets you link this magnetic node straight into diverse systems—such as 3.3V core modules, 5V microcontrollers, or single-board compute arrays—protecting your sensitive logic pins from floating signal spikes.
Rugged Construction Tailored for Continuous Duty
- Reliable environmental tracking that is built to last. Combining a tough compact housing shell with specialized internal static protection and a built-in pull-up matrix, this Hall Effect board handles rapid speed rotations and prolonged operational stresses without dropped signals.
Package includes:
- 1 x Hall Effect Unit (with A3144E sensor core)
- 1 x Grove-CompatibleHY2.0-4P Cable
- 1 x Magnet Accessory Element
