Dual RC522 on Orange PI PC

nedoskiv

Hello,

my goal is to use two RC522 RFID readers on orange pi. In order to do that I will need help.

Let me first explained how I made one work (googled it read, test and it work)

GUIDE HOW TO USE SINGLE RC522 on Orange PI PC

hardware connection:

     MOSI ——————————> pin 19
     MISO ——————————-> pin 21
     SCLK ——————————-> pin 23
     SDA ——————————–> pin 24
     RST ———————————> pin 22
     IRQ ———————————-> NONE


that is all about hardware connection, let look at software part, on Armbian some stuff are out of the box, so we need to install few things only:

Install python dev

     apt-get install python-dev

Install orangepi_PC_gpio_pyH3 Library

      git clone https://github.com/d...C_gpio_pyH3.git
      cd orangepi_PC_gpio_pyH3
      python setup.py install
Install SPI-Py Library

    git clone https://github.com/lthiery/SPI-Py.git
    cd SPI-Py
     python setup.py install

Install MFRC522-python
     git clone https://github.com/r...C522-python.git


tricky part is that MFRC522-python was made to work with Raspberry. In order to work on OPI we need to edit MFRC522.py  a little:


replace : (it is at beggining at the file)
import RPi.GPIO as GPIO

with

import pyA20.gpio as GPIO



comment some lines around (110-115) as shown below:

  def __init__(self,spd=1000000):
    spi.openSPI(speed=spd)
#    GPIO.setcfg(GPIO.BOARD, 1)
#    GPIO.setup(22, GPIO.OUT)
#    GPIO.output(self.NRSTPD, 1)
    self.MFRC522_Init()^M

also (around line 355)

  def MFRC522_Init(self):
#    GPIO.output(self.NRSTPD, 1)

    self.MFRC522_Reset();


you are good to go: (try to read a card)

        python read.py

root@orangepione:~/MFRC522-python# python read.py
Card read UID: 193,11,21,149,74



Here is the place where single RC522 guided ends and I can ask for a help.

I was reading and googling about how to make 2 of those works, there are some solutions maded for Raspberry. I got no skills/knowledge to make them work on orange PI. (example: https://github.com/e...os/TwoRC522RPi)

connecting 2 RC522 use common (shared pins) only difference is SDA signal of second rc522 must go to pin 26.

MFRC522.py need to be modified, to use SDA to select from which reader it reading data.  Reading further, points that same line that we comment in order to run it on OPI are responsible for that. I try to uncomment them but scripts fails, looks like in pyA20.gpio are not present those (or are different) functions that are responsible to control that signal.
I got not much python knowledge and cannot solve that. Can someone please help?

emmaorabelle

As for the software part, you will need to modify the code to handle two readers instead of one. This could involve creating two instances of the MFRC522 class and using different sets of pins for each instance. You may also need to modify the code to handle interrupts from both readers if you are using an IRQ pin. lol shot io

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