NFC (Mifare) cards reader. PIC, NXP PN532. Proteus.

Hello! I was given a task to make a reader for NFC tags and Mifare cards (Classic cards would be enough, I suppose). What it should be like: I have to connect NXP PN532 reader (link below) using UART interface (I think it is more preferable than I2C or SPI interface because of its simplicity) with PIC microcontroller, which should be modelated in Proteus. Connection between PN532 and PC should be made with help of RS232-USB adapter, as far as I undersand. The goal is to make authentification using mifare classic cars. I don't exactly know how it is usually done, but I would have made it in following way: get the uid of mifare card, which is stored in block 0, save uid in non-volatile memory of PIC, and in next requests just compare the uid of the card with the uids from PIC memory. This method has a downside of potential running out of memory, so another one comes to my mind: set key (that no one except you knows) for one of the sectors of the card and also store it in non-volatile memory of PIC. Then we can just check if passed authentification to get access to this sector or not. This method also has a downside, as a length of the key is only 6*8 = 48 bits. So if know a better way of organising authentification process, please tell me :) Also it would be good to include to organise any input or output. For example, we might type in terminal or with keyboard a key which will be stored in card and PIC memory, also we might select a sector, where we will store the key. Finally, we can put some text in blocks protected with out key, for example, the name of the owner of the card. Then, when PN532 reads our card, we might show the name of the owner on the led of terminal. As for PIC, I would like to pick as simple one as possible. I think that PIC16F877A would be ok, but i might be mistaken :) Finally, I need a step by step guide of what you have done, cause I really want to know how to make all that stuff work, but just have no enough time to make it by my own :с I will put a link of one the guides, which I want your guide should be look like. Not in terms of style, of course, but in terms of the amount of detailed information :) Links: pn 532 user manual [login to view URL] pn 532 long datasheet: [login to view URL] pn 532 short datasheet: [login to view URL] mifare classic datasheet: [login to view URL] using mifare classic tags: [login to view URL] Good guides: [login to view URL] [login to view URL] pn 532 on ebay: [login to view URL]