I know you can buy commercial cat door that can read embedded cat microchips does anyone know of a way of doing a DIY job?

Ideally would like to read the pet microchip, and restrict inbound and outbound access based on timezones in the alarm system i.e. allow the cat to come and go during the day but restrict access overnight and maybe have different rules for different pets.

I've googled a few DIY projects where people put an RFID on a cat collar but havent found any DIY RFID projects that work with the embedded microchips I would have thought it would be more common.