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    RFID RC522 on Raspberry PI with NodeJS

    node.js module to access a rfid reader with rc522 chipset which is connected a raspberry pi

    Fork of

    This is a fork with added functionality. For a nice and simpler module please see the original and adjustment of


    This node module is to access RFID reader with a rc522 chipset (e.g. via GPIO interface of the raspberry pi.


    The module is currently only able to read the serial number of the tag which is hold onto the reader.


    1. Install node:

    curl -sL | sudo bash -
    sudo apt-get install -y nodejs

    2. Update your PI:

    sudo apt-get update
    sudo apt-get upgrade
    sudo apt-get dist-upgrade
    sudo rpi-update
    sudo apt-get clean

    3. Configure the PI:

    The RFID reader is plugged onto the raspberry pi like it is described over here

    • The GCC compiler is installed sudo apt-get install build-essential
    • node-gyp is installed sudo npm install -g node-gyp

    4. Compile the spi_bcm2835 driver:

    First of all we have to install the C library for Broadcom BCM 2835 as it describe` here

    tar -zxf bcm2835-1.49.tar.gz
    cd bcm2835-1.49
    sudo make check
    sudo make install
    sudo modprobe spi_bcm2835

    5. Make a node project

    cd ~/
    mkdir RFID
    cd RFID/
    npm install --save rc522
    nano rfid.js

    Put this into:

    var rc522 = require("rc522");

    Save and run: (Is necessary "sudo")

    sudo node rfid.js

    NOTE: Running as root

    Prior to the release of Raspbian Jessie in Feb 2016, access to any peripheral device via /dev/mem on the RPi required the process to run as root. Raspbian Jessie permits non-root users to access the GPIO peripheral (only) via /dev/gpiomem, and this library supports that limited mode of operation.
    If the library runs with effective UID of 0 (ie root), then bcm2835_init() will attempt to open /dev/mem, and, if successful, it will permit use of all peripherals and library functions.
    If the library runs with any other effective UID (ie not root), then bcm2835_init() will attempt to open /dev/gpiomem, and, if successful, will only permit GPIO operations. In particular, bcm2835_spi_begin() and bcm2835_i2c_begin() will return false and all other non-gpio operations may fail silently or crash.



    npm i rc522

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