micropython-mfrc522
(Micro)Python class to access the MFRC522 RFID reader
D.Perron Feb. 2021 Add Raspberry Pi Pico compatibility
D.Perron Sept 20 2019 Modification to be able to read 7 and 10 BYTES RFID P.S. I didn't test the write mode.
D.Perron
Sept 15 2021
Addition of RfidAccess Class! this allows to set or read access bits.
Addition of read and write using sector/block and selecting KEYA or KEYB.
Add more examples on how to change access block. (Block3 of each sector>.
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.
Usage
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 ESP32 | GPIO WiPy | GPIO Pico | Note |
|---|---|---|---|---|---|
| sck | 0 | 18 | "GP14" | "GP2" | |
| mosi | 2 | 23 | "GP16" | "GP3" | |
| miso | 4 | 19 | "GP15" | "GP4" | |
| rst | 5 | 22 | "GP22" | "GP0" | |
| cs | 14 | 21 | "GP14" | "GP1" | SDA on most RFID-RC522 boards |
Now enter the REPL you could run one of the two exmaples:
The Pico_write example has been added but be aware of
- The software treated the memory has 64 sectors of 16 Bytes.
- In reality the mifare card is 16 sectors of 4 block which are 16 byte. The Block 0,1 and 2 are data block. The block 3 is the access block.
- BE AWARE if you write sector (3,7,11,15...,63) then you should know what you do.
- CreateNdefTag.py Explain how to set access block on each sector. It will create an empty NDEF tag.
- EraseNdefTag.py Recreate a blank Mifare tag after you use CreateNdefTag.py.
- ReadNdefTag.py Dump the contents of a NDEF tag.
- Pico_read.py Dump the contents of a Mifare card using the default key.