@Gunner’s tutorial/examples of how to use timers is a good starting point:
This is also an excellent reference of which GPIO pins to avoid:
I’ve done some work with RFID recently and it’s pretty easy to do when you get the hang of it, but most weatherproof RFID readers need a 12v supply and use 5v logic levels (the Wemos uses 3.3v logic levels) so you’ll need to use a logic level shifter and have a 12v supply available (which shouldn’t be that difficult in a garage with mains voltages available).
I just made a new controller for my door entry system that will be used on my front gate. I mounted the logic level shifter and a 12v to 5v regulator on a Wemos sized prototyping board, along with sockets for the RFID reader (bottom) and 12v power + reset button so that it can plug in to a Wem,os tripple base along with the WEmos D1 Mini Pro and the relay that will activate the gate release.
I’m using the Wemos Pro because it will all be mounted in an aluminium box, so I need an external aerial to allow the Wemos to pick up a decent Wi-Fi signal from the house.
Pete.