Hi everyone¡¡
I am using the RFID-RC522 sensor with the MFRC522.h library, no problem using it, it works perfect, I got the max gain 48DB, its gave me a range of 1 to 2 centimetres with Mifare 1K an 4K cards, but if there are any obstacles, like a door, it can't read and less write to the card, I need a bigger range for read and write operations, i had looking for a solution but i did not found any thing, the only way is improving the antenna, I suppose that this can't do it with the build in one, replace the build in antenna and connect an external one seems to be the only solution, anyone tried it?, any suggestions?.
Thanks an advance for any help.