YouTube member AlmightyArjen has published details and a video of an awesome LEGO pneumatic compressor which has been automated using a little Arduino programming and hardware. Watch the demonstration ...
This is a basic Arduino code which will allow you to drive the pressure of the pneumatic actuator to a certain value, as well as printing the debug value on the Serial Monitor every 200ms.
Modify config.ini for your Serial connection. This was primarily developed on linux. Super weird, but the one Windows machine that I tested required a delay after instatiating the Arduino class: ard = ...
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