Meet the SunFounder 3+1 DOF Robot Arm Kit: a smart robot kit for Raspberry Pi that can teach you a thing or two about coding. It is a 3DOF robot ready for visual and Python programming. It is easy to assemble and has 3 interchangeable parts (shovel bucket, hanging clips, and electromagnet).
This Raspberry Pi Robot PiArm can take on digging, picking & placing, and holding objects. It can be controlled with a joystick or smartphone.