Variable Color LED
The Grove Sensor Adapter (mindsensors.com) is used in several projects in “High-Tech LEGO,” and another use is shown here in driving a variable color LED from Grove (seeedstudio.com). The standard LED board from Grove is simply for turning on and off a single-color LED. But Grove also makes an LED board of color that can be changed. This color changeable LED is a red-green-blue LED with the brightness of each of the three constituent colors controlled by three trimpots on the back of the Grove board. A tour of using the Grove Variable LED is in the above video.