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The Magnetic Sensor (Switch) Module allows you to detect the presence of a magnet via a digital input on your microcontroller.
Usage
Connect the ground (G) and voltage (V) pins to a 3-5V power supply and the signal output (S) pin to a digital input on your microcontroller. The signal output (S) pin will be LOW when a magnetic object is detected, otherwise it will be HIGH.
Documentation
Downloads