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Arduino Reflectional Infrared Switch Sensor Module - 2cm
It is very interesting Electronic Brick Module
Infrared switch can detect objects within 2cm around the object .
This module can be used with Arduino Special Sensor Shield V4.0 by digital sensor cable.
You can do some simple design around it, this brick also support "plug and play" .
When connecting to Arduimp sensor shield,you need Arduino sensor cables (15cm / 30cm / 60cm / 100cm / 200cm optional)