Omnipolar Magnetic/Hall Sensor
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Digital output that changes state when any magnetic field is detected nearby. This is not an analog hall effect sensor, it only has 2 output states: 0, 1. See datasheet for more details.
It is an OMNIPOLAR magnetic sensor, meaning it will detect both North & South poles, which means you don't have to worry about orientation!
It replaces the older Melexis-US5781LUA which was unipolar (detected South pole only), but they both have the same pinout:
This sensor will need a 1-10K pullup resistor between OUT and VDD. It will then output a 1/HIGH with no magnet present, and a 0/LOW with magnet present.
Click here for datasheet.