This 5mm Water-clear Phototransistor will pick up visible and infrared light and conduct current. When light reaches this high sensitive/fast response time component it's much like current reaching the base of a transistor which allows current to flow from collector to emitter.
FreeM is a wireless Infrared I2C controller for completely stand-alone programming and control of BlinkM smart LEDs. It's like an invisible wire linking a Remote, a LinkM, and/or an Arduino to BlinkMs.
Work your way through an amazing set of 50 cool Arduino projects with Beginning Arduino! Absolutely no experience in programming or electronics required. This book will guide you from start to finish with Arduino programming and electronics knowledge & skills.