Arexx mini programmable robot arm arexx engineering ra2 hobby p the arexx mini robot arm is an affordable robot for the hobbyist it is ideally suited to learning the basics of electronics mechanics and programming 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 together with the flexi