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[Vinny]

I got a pneumatic cylinder from MPJA a while back with a 12" stroke. On ebay I found this 380700971386 which is a circuit board with a small pneumatic cylinder on it. I don't plan on using the cylinder, but the board has a pneumatic solenoid on it and an optical sensor. When you put power to the board and interrupt the optical sensor, the solenoid energizes and the piston goes out. After about a second, it comes back. That "second" can be changed by a resistor/capacitor pair. I plan on making the resistor variable so I can use it to control the stroke length. I'll control the speed by air pressure.