Hall Effect Magnetic Sensor Module Arduino Raspberry Pi | eBay
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Interfacing Hall Sensor with Raspberry Pi
KY-003 Digital Hall Effect Sensor Transistor
Pzsmocn Hall Sensor Compatible with Arduino and Raspberry Pi. Detection Range About 3cm (Detection Range Related to Strength of Magnetism), for Non-Contact Switch and Magnetic Related Project.: Amazon.com: Industrial & Scientific
Magnetic Hall Effect Sensor Arduino Programming Interfacing, applications