Seeed Studio Studio Grove Hall Sensor v1.0 - Continuous-Time Hall Effect Sensor Module

The module provides a digital output signal. The output pin switches to a logic LOW state when a magnetic field of sufficient strength (south polarity) is detected perpendicular to the sensor face. It returns to a logic HIGH state when the magnetic field is removed, providing a clean digital signal for direct connection to a microcontroller GPIO pin.

The module operates from a wide 3.8V to 24V DC supply. The digital output signal follows the supply voltage (VCC). When powered with 5V, the output is 5V logic; when powered with 3.3V, it's 3.3V logic. This makes it directly compatible with both 5V systems like Arduino Uno and 3.3V systems like Raspberry Pi or ESP32, provided you use the corresponding VCC voltage.

Connect the module using its standard 4-pin Grove connector. The cable breaks out to VCC, GND, and the digital signal output (SIG). For Arduino, use a Grove Base Shield. For Raspberry Pi, use a GrovePi+ shield or connect the pins directly: VCC to your chosen 5V/3.3V, GND to GND, and SIG to any digital input pin. No additional pull-up resistor is required.

This continuous-time Hall sensor is specifically triggered by the south pole of a magnet. When the south pole of a magnet is brought perpendicularly close to the marked side of the sensor, exceeding the built-in operate point (BOP) threshold, the output switches low. The north pole will not trigger the sensor. The magnetic field must be applied perpendicular to the sensor face for reliable operation.