2 Stück RPI-1031 Winkelsensor 4DOF Attitude HM Modul stabil für Arduino
3,94 €
AS show,infrared is blocked.So two receivers can not receive signal.So sensor's status is OFF as low level and both output low level. Optical principle: There are one infrared LED and two photosensitive triode receiver and a cylindrical shade inside as picture.
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