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Hall sensor for fischertechnik
Can be used as end stop, rotary counter etc. Needs a suitable magnet, for fischertechnik I recommend 4x4mm cylindrical neodym. Pins are labeled O for Out, ⏚ for GND and V for Vin. Don't forget a pullup resistor on the output, the microcontroller's internal pullup will do fine.
Designed for Micronas HAL 525, HAL 526 Hall-Effect Switches:
However, the form factor is quite common so I assume it will fit for similar sensors, too.
Bend back the sensor's legs, clip them to length and solder them to a 5 pin male pin header, remove the two outer pins and you're ready for assembly.