If you are interested in manipulators, robot Ramenak is a great choice for you. Ramenak is robotic arm with the magnetic effector. You can control it using joystick and potentiometer and check your motor skills. It also possible to add the bluetooth module and control Ramenak using smartphone or tablet.

Ramenak's build instructions are in document l03-ramenak-v01r01-web.pdf (in Czech). Playground and rules of the easy game with Ramenak is in l03-ramenak-game.pdf (in Czech).