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Hi adammusic.

I can help you a bit. What are you looking to do? Someone walks up, it whooshes open, stays open a while, then closes? I could do that lots of ways, but the computer, ermm.. I don't like arduinos, and you would need to run a signal from a sensor to the computer to tell the computer to send a signal to a relay to open the solenoid ( or actuator) and open the door and then send another signal to the computer to tell it to close the door, via another signal to the solenoid or whathaveyou. Sheesh.

I would cut the computer right out of the equation, and just use a motion sensor, unless its critical that the door closes very quickly after the person walks through. Grainger has an adjustable inline pressure relief valve to keep the door from squishing someone in the event they just stand in the doorway. If its an actuator powered door, you will need a different way to prevent the door from closing on someone. I will think about it.
 
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