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The Fasting Life

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Henry Rogers
Henry Rogers

How to Use MFRC522.h with SPI Interface for RFID Reading and Writing



Hi, everyone.I have some trouble for SPI.h library.I want to use MFRC522 sensor for Arduino , so I download the MFRC522.h library.But when I verify the code, it has error compiling for IDE 1.5.7 like this.




download mfrc522.h



So is there a question left?You haven't yet described which exact hardware you were using. Please provide the exact type of the microcontroller-board and the components you are using.Please provide links to product-descriptions and whenever possible provide download-links to datasheets or attach the datasheets to a posting


Your RFID-reader has its own special-purpose-"microcontroller"-Chip called MFRC522.So do a google-search for Datasheet MFRC522google will find multiple sources where the datasheet can be downloaded.an MFRC522 is pretty common. But the really important information for every potential user here is the chip-type which ismentioned in the amazon-product-description.Only with knowing your RFID-reader is based on the Chip-type MFRC522 makes it possible for helpers to give advice:Use a library that is able to control a MFRC522-Chip.


Upon fresh install of the arduino IDE on Kubuntu 19.10, I downloaded and extracted the MFRC522 library for RFID communication into the /sketchbook/libraries/ directory. No automatic library manager is available in my version of the IDE (2:1.0.5+dfsg2-4.1), unlike suggested in tutorials on importing libraries.


In our example we are using the MFRC522 library that can be downloaded from the Arduino IDE. The PCD Reader itself can support the other standards, but the library used here implements support for the RC522 only.


How to download and install MFRC522 Arduino library for RFID


Download MFRC522.h file from GitHub and use it in Arduino IDE


Arduino RFID tutorial using MFRC522 library and SPI interface


MFRC522 RFID reader module datasheet and pinout diagram


Arduino RFID projects with MFRC522 and Mifare cards


How to fix MFRC522.h: No such file or directory error in Arduino


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Once everything is hooked up and the program is downloaded and running, open the Serial Monitor window to see the output. Note that we are using a baud rate of 115200 so set the Serial Monitor window accordingly. We are using a higher speed link so that we can download the data faster to the window.


So I guess the earlier versions of SimpleMFRC522 were not very compatible to python3. I was wondering if my pip3 installed stuff is more or less updated than the OP's corresponding software using Git Clone. I guess I better download the most updated versions of mfrc522, SimpleMFRC522, and the demo/test red/write tag programs and freeze them for later testing.


It's a bit hard to find the library online these days, but at the bottom of this page ( =Mifare_RC522_Module_RFID_Reader) if you download the "RFID-RC522_test_experiment" zip file it will have the library in there. The secret is that this library includes a software SPI which is sort of like a software serial for SPI communication. Letting other digital pins be used as MISO etc...


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