So you want to learn more about robots? Building your own is the best way to get started. ShotBot is an Arduino powered shot pouring robot that you can build using RobotGeek Pumping stations. The code for the project is simple, and you can always use advanced sensors to do more with the robot.
The above video provides more information on this robot. You will need a Geekduino, 2 pumping stations, 1 x sensor shield, and a few other parts to get started. More information is available here.