(Micro)Python class to access the MFRC522 RFID reader
Basic class to access RFID readers of the type MFRC522. This is basically a re-write of this Python port for the MFRC522. I tried to strip things down and make them more "pythonic" so the result is small enough to run on Micropython boards. I tried the class so far on the ESP8266 and the WiPy.
Put the modules mfrc522.py, examples/read.py, examples/write.py to the root of the flash FS on your board.
For the ESP8266 there are multiple solutions to do that. E.g. use the
WebREPL file transfer, or mpfshell.
I used the following pins for my setup:
| Signal | GPIO ESP8266 | GPIO WiPy | Note |
|---|---|---|---|
| sck | 14 | "GP14" | For hardware sck (esp) |
| mosi | 13 | "GP16" | For hardware mosi (esp) |
| miso | 12 | "GP15" | For hardware miso (esp) |
| rst | 2 | "GP22" | |
| cs | 16 | "GP14" | Labeled SDA on most RFID-RC522 boards |
Note for the hardware spi on the esp8266 the sck, mosi, and miso pins don't need to be specified for initalization, only spiblk needs to be set to 1. In software mode they will need to be specified and spiblk can be left unset.
Now enter the REPL you could run one of the two examples:
For detecting, authenticating and reading from a card:
import read
read.do_read() #for software
read.do_read(1) #for esp hardware
This will wait for a MifareClassic 1k card. As soon the card is detected, it is authenticated, and 16 bytes are read from address 0x08.
For detecting, authenticating and writing to a card:
import write
write.do_write()
This will wait for a MifareClassic 1k card. As soon the card is detected, it is authenticated, and 16 bytes written to address 0x08.