Exercise Two Deliverables (Reflectance Sensors)

**Sensors Secured to AEV**

The reflectance sensors have a small phototransistor and a single infrared LED.  These two things are connected to a voltage divider. If the voltage divider records a low output voltage, this means there is greater reflection (the aluminum tape).  The Arduino will record each time a non-reflective surface passes over the sensor as a “mark”. From here, the AEV can determine how far it has gone in mark units.