This module s a magnetic hall effect sensor, if no magnetic field is present, the signal line of the sensor is HIGH.
If a magnetic field is presented to the sensor, the signal line goes LOW, at the same time the LED on the sensor lights up.
The polarity of the magnetic field is of influence to the switching action, the front side of the sensor needs the opposite polarity as the back of the sensor to switch on.
TIP: reverse the polarity of your magnet if it has no effect on the sensor
Working voltage : DC 5v
Power consumption : 10mA
Applications: speed detection, odometer, speedometer/tachometer, limit switching / robotic control, etc
