Each arm has five degrees of freedom, controlled by proportional hydraulic valves. The power loader is controlled by an industrial grade control system based on the Raspberry Pi, running ROS.

Hydraulic components are the industrial power transmission version of LEGO. Pumps, cylinders, valves – pretty much ... of the rotary dual-action proportional valve he designed.

The card is normally connected to a PC via National Instruments hardware. The stand includes the following electro-hydraulic elements: D1FX proportional 4-way directional control electronic valve D1FH ...