Arx ch09 robot chassis arexx engineering arx ch09 p a self assembly kit which allows rapid prototyping of robotics projects using microcontrollers the kit includes two motor and gear sets wheels rollerball rear wheel and 4x aaa battery box p p incorporate your own choice of microcontroller such as genie or picaxe and then add sensors such as microswitches or the popular srf005 ultrasonic range finder 78 1085 p arexx arx ch09 robot chassis