Advice: Best method for a self opening and closing door

I want to change my back door's deadbolt into a smart lock.

Then have some type of pulley system to pull the door open and closed at a tap of a button.

I am unsure how to go about this, I'm open to opinions!

submitted by /u/JayBird9540
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from DIY https://ift.tt/2QmIdEH