Using the Light Sensor A LEGO light sensor utilizes a LED and a phototransistor to read the reflection of light off a surface. Light sensors are useful. - ppt download
Lesson 4 | Lessons | GEAR - Get Excited About Robotics | STEM Outreach | Whitacre College of Engineering | TTU
Lego 2982c25 Technic Electric Light Sensor Mindstorms RCX Gray Blue Set of 5 | eBay