Arexx ra1 pro metallic programmable robot arm kit arexx engineering ra1 pro p the arexx big metal robot arm is ideally suited for school and educational projects and helps to learn the basics of electronics mechanics and programming p p the robot arm is controlled by a powerful atmega64 microcontroller that is programmable via open source tools in c the user can upload his own programs simply and easily via the supplied usb interface and the uploader software the i o inputs and outputs