The IR Infrared Slot Sensor Relay Switch Module
Instructional video in listing

This listing is for an awesome slot sensor relay driver board.  This board is shipped to you with the slot sensor module connected.  When nothing is obstructing the slot sensor module, the relay is on.  When something is breaching the slot sensor module, the relay is off.  Above is a full demonstration of how this module works.  It requires 5v @ >80mA to operate.  If you have any questions at all after watching the video, please do not hesitate to ask!

Interface Pins:
VCC - Supply line.  Connect 5v here.
GND - DC ground line
Relay Interface Pins (Not labelled in English.  Please see where they are in the video, as they are talked about):
COMMON PIN -  When the relay is not activated, this pin is connected to the NC (Normally Closed) Pin.  When activated, it connects to the Normally Open (NO) Pin.
NORMALLY CLOSED PIN - When the relay is off, this pin is connected to the CO (Common Pin) 
NORMALLY OPEN PIN - When the relay is turned on, this pin is connected to the CO (Common Pin)


Specifications:
Operating Voltage: 5v
Standby Current: <15mA 
With Relay Turned On: >80mA
Main Board Length: 50mm
Main Board Width: 18mm
Slot Sensor Board Length: 16mm
Slot Sensor Board Width: 15mm
Slot Sensor Board Height: 13mm