This is probably the smallest Arduino controller speically designed for controlling the servo. It features a 12 standard servo control capbility with Xbee socket which can be used to control helicopter or UAV via the Xbee link. The feather weight (7.5g) make it an ideal controller for those application that has limited payload. The build in regulator is allow the input voltage vary from 3.5-8V which fits the most power supply without any modification.
This DFRoobot relay shield V2.1 is a completely new desgin which is capable of controlling 4 relays. The max switching power could be DC 90W or AC 360VA. It could be directly controlled by Arduino/DFRduino through digital IOs with external 9v supply. With buildin xbee type socket, it can be wirelessly controlled via Xbee/bluetooth/WPM. Make it an ideal solution for home automation and robotics purpose.
ROBOTIS DREAM Level 3 comes with the controller and teaches you the principles of servo motor control, usage of the touch sensor and IR sensors, and LED modules. This level will help you understand the flow chart to set up your ground work for programming.
ROBOTIS DREAM LEVEL 4 provides more advanced teaching of robotics. Machine equipment such as LEDs and caterpillar wheels are introduced, and scientific principles such as energy transitions are taught. Additionally, many examples are provided, which will prepare you for robotics competitions.
ROBOTIS OP3 is an affordable, miniature humanoid robot platform with advanced computational power, sophisticated sensors, high payload capacity, and dynamic motion ability to enable many exciting research and education activities.