The Sharp IR Distance Sensor GP2Y0A41SK0F is a great low cost robotic range-finder. The Distance Sensor will report the presence of an object 4-30cm away from the sensor. The sensors reports this data as an analog value readable by most microcontrollers, like the Arduino. This sensor can plug directly into a RobotGeek Sensor Shield using a Sharp IR to Servo Cable. This cable can also be handy to connect to other systems and controllers (users can cut/splice the wire). If you want to use this...