DFRobot Gravity Digital Hall Sensor - Omnipolar Magnetic Detection Module

This omnipolar Hall sensor responds to magnetic fields from both the North and South poles, switching its output when either pole is brought near. A bipolar sensor, in contrast, distinguishes between poles, typically providing one output state for North and the opposite for South, requiring specific pole orientation for detection.

Sensitivity is adjusted by turning the onboard potentiometer. Clockwise rotation generally increases sensitivity (detects weaker magnets at greater distances). The digital output pin is normally HIGH (at the supply voltage, e.g., 5V or 3.3V) and switches to LOW (near 0V) when a magnet of sufficient strength is detected within the adjusted range.

Yes, you can connect it directly. Ensure you power the module from the Raspberry Pi's 3.3V or 5V pin (compatible with both) and connect the sensor's digital output signal (SIG) pin to any configured GPIO input pin on the Pi. The module's output is clean digital logic and safe for the Pi's 3.3V logic levels.

The detection range is not fixed and depends on magnet strength and the sensitivity setting. With a small neodymium magnet, detection can occur from a few millimeters up to 1-2 cm. The sensor can detect magnetic fields through non-ferrous materials like plastic, wood, or aluminum, but ferrous metals will shield or distort the field.