Step 9: The Sensor
The sensor comes as an array of 8 sensors. There are 2 on the end that can be removed and need to be removed. I used a pair of side cutters to do this. A 9 pin strip of female headers has to be soldered on to the sensor from "GND" to pin "6" of the sensor. I then plugged in a strip of male headers.
These sensors put out an analog voltage based on how much IR light is being reflected back. We can use these to detect the white and black areas on the maze. The sensor outputs a low voltage near 0V if the sensor detects a white surface. The sensor outputs a voltage near VIN if it detects a dark surface.