Wifi Door Lock

High difficulty
Need good electronics knowledge
Need a bit of code knowledge, at least be able to edit in the wifi name and password.
Need arduino Ide to upload then code
I tried different sizes of servo and they all broke sooner or later, this more expensive servo has been going strong for probably a year now.
fusion360 file attached for ease of assembly
I drilled a hole at the side of the lock, and tied the string internally, door lock still works by itself and with key.
You can drill a hole in the knob you turn and attach it there , easier but worse.

You unlock the door by putting the wemos ip address into google search,
for easier access , when loaded , add the webpage to homescreen then the door unlocks when you press a button on your phone homescreen

code-
https://pastebin.com/iRriDFDt

parts-
assortment of m3 bolts
m3 inserts
wemos d1 mini
ds3218 180 degree servo
m5 bolt around 45mm
2 m5 nuts
2 m5 washers
switch
Xl4015 step down converter (5v for servo)
mini step down convert