This is an edge detection sensor from DFRobot. It will help your robot detect the edge of a precipice, preventing it from falling off a table or down the stairs to it's certain demise! This IR distance sensor is connected to an arduino digital pin.
Edge detection sensor
Intelligent Mobile Robotics Platforms
Home Cleaning Robots
Supply Voltage: 2.7~6.2v
Current: < 10mA
Detecting Distance: 2~10cm (Low), <2cm or >10cm (High)