At the entrance to my office, we have these two glass doors that swing open (with a bit of resistance) and they automatically close slowly behind you. If you open them all the way (so, perpendicular to their normal position), they stay open. I wanted to give our office manager the ability to remotely close the door without having to go down two flights of stairs.
So I was thinking that a solenoid wouldn’t work, because it’s too fast and could shatter the door. But I need something that can go slowly, but also has enough force to push past the “thing” that keeps the door in the open position, to get it to close on its own.
Obviously this thing whatever it is would be controlled by an Arduino. I already built a board that uses a distance sensor to detect if the door is in the fully open position.