RFID SELENOID ARDUINO MEGA. room automation , doorlock automation system

I have RFID, solenoid, ARDUINO MEGA to make door security system. I will use blynk in this application. blynk whether the application can store data from RFID? and in Blynk interface, widgets used to display the data?

Of course that will work. There are probably several ways to go about it. You could store RFID information in the EEPROM for one. That is probably the most simple and robust solution.


how much data can be stored in eeprom?

I have no idea. The Arduino documentation probably has that listed.