Assuming Control My previous post left off with the oxygen concentrator mechanically complete. All it needed was some electronics to control the solenoid valves. The PSA cycle is so simple that you could easily implement the entire controller in ladder logic on a PLC, or even in discrete timers. That said, I do PCB layout and a lot of Arduino programming for a living so I chose to build my own little Arduino-based solution. Arduino on (DIN) Rails I chose to mount all of the electronics for this ...