ESP8266 Community Forum

Is it possible for me to have a local memory in NODEMCU to create an access control system?
If it is not possible would it be possible for me to create a communication between the Node MCU as client searching in a database in raspberry?

How much data would you be able to record?

Thank you

How much data would you be able to record?

Lots.

Kind of vague answer, like the question. It depends on you needs. How big is the database?

The ESP can make use of 3Mb of flash memory as a file system. It has limitation but it can be very useful for some applications.

Take a look at https://github.com/omersiar/esp-rfid