![\"mfrc-522package\"](\"https:\/\/i1.wp.com\/einhugur.com\/blog\/wp-content\/uploads\/2016\/10\/MFRC-522Package.jpg?ssl=1\")
<\/a><\/p>\nThis is how the kit I bought came, it has the MFRC-522 RFID reader board, 2 sets of header pins (straight and with 90 degree angle), one RFID token, and two RFID cards.<\/p>\n
You have to solder the header pins into the board. I choose the angled ones so I could easily stick the board into breadboard. In mater of seconds this was done. (If you have not experimented with hot air touch free soldering then I highly recommend doing so as once your there then there is no going back)<\/em><\/span><\/p>\n I was worried in this project that it would end up in drama at almost all stages but it turned out to be really easy, I had no fails at any stages of this experiment.<\/p>\n Disclaimer:<\/strong><\/p>\n We do not take any responsibility for possible errors in the guide or errors that you might do wiring it up. Incorrect wiring can result in damaged\u00a0relay board\u00a0or damaged Raspberry PI. Connecting the high voltage connectors can potentially be life threatening, be careful and do at your own risk.<\/p>\n Pieces we use in this example:<\/strong><\/p>\n If you are not familiar with breadboards, how to place a cobbler on the breadboard or need to know how to read the color codings on the resistors then click here bellow<\/strong><\/p>\n \u00a0<\/i>\u00a0 Using breadboard<\/a> \u00a0<\/i>\u00a0 Resistor color codings<\/a><\/p>\n Once you have the header pins soldered in the board and your cobbler placed on the breadboard then here is how you will want to wire the\u00a0MFRC-522 card reader:<\/p>\n SDA\u00a0->\u00a0GPIO8\u00a0<\/em> Here is how it ended for me:<\/p>\n When you power up the Raspberry PI then the\u00a0MFRC-522 RFID reader board should have one light on it.<\/p>\n You need to do some configurations to prepare connecting to this device:<\/p>\n Assuming the Python test above passed then we proceed to make Xojo application use the Python driver.<\/p>\n First grab Einhugur Python script plugin from the Einhugur web<\/a>. (If you don’t got license then grab the Demo version, it will run as full version on Raspberry PI since Einhugur Plugins are free on Raspberry PI). You will want the one called PythonScript and not Python3Script, since the device driver we use is made for Python 2.7.x.<\/p>\n We write a small python stub to interface with the Python Driver: (The file for it is also included with the downloadable example project)<\/span><\/em><\/p>\n Then the Xojo code will be something like this:<\/p>\n <\/p>\n Window Open event:<\/strong><\/p>\n <\/p>\n The timer event for a Poll timer:<\/strong><\/p>\n <\/p>\n Cleanup in the Window close event:<\/strong><\/p>\n Downloading the code:<\/strong><\/p>\n Bellow is a download link to download the code. Make sure after you compile to create folder called\u00a0PythonModules at same place as your application is and drop into that the Python driver for the RFID reader and the Python stub we created.<\/p>\n \u00a0<\/i>\u00a0 Download the code<\/a><\/p>\n Thats it for now !<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" In this example we are going to connect to MFRC-522 RFID reader. The MFRC-533 is for 13.56 MHz RF tags. This board like many other boards need fairly complex driver and since I believe Xojo should be about productivity and not always having to start from scratch at re-inventing the wheel then we will be … Continue reading MFRC-522 RFID reader in Xojo (Bridged with Python)<\/span> \n
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\nWiring up the board<\/h2>\n
\nSCK -> GPIO11<\/em>
\nMOSI -> GPIO10<\/em>
\nMISO -> GPIO9<\/em>
\nIRQ ->\u00a0Not connected<\/em>
\nGND-> GND<\/em>
\nRST -> GPIO25<\/em>
\n3.3V ->\u00a03.3V<\/em><\/p>\n<\/a><\/p>\n<\/a><\/p>\n
\nMaking sure things work before we use Xojo<\/h2>\n
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\nIf all is ok then you should be able to type into console now:<\/span>
\nls \/dev\/spidev0.*<\/span>
\nIt will give you response with yellow letters if all is ok.<\/li>\n
\nsudo apt-get\u00a0update
\nsudo apt-get install python-dev
\ngit clone https:\/\/github.com\/lthiery\/SPI-Py.git
\ncd SPI-Py
\nsudo python setup.py install<\/li>\n
\ngit clone https:\/\/github.com\/rasplay\/MFRC522-python.git<\/li>\n
\ncd MFRC522-python
\nsudo python read.pyScan your cards or tokens.(If the test fails then you can refer to this page<\/a> for example for trouble shooters. There are many pages that have info on how to connect to this device using Python).<\/em><\/li>\n<\/ol>\nMaking Xojo use the Python driver<\/h2>\n
import MFRC522\r\nimport signal\r\n\r\nMIFAREReader = MFRC522.MFRC522()\r\n\r\ndef CleanUp():\r\n MIFAREReader.GPIO_CLEEN()\r\n\r\n\r\ndef Read():\r\n (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)\r\n if status == MIFAREReader.MI_OK:\r\n \t(status,backData) = MIFAREReader.MFRC522_Anticoll()\r\n \tif status == MIFAREReader.MI_OK:\r\n \t\treturn str(backData[0])+\",\"+str(backData[1])+\",\"+str(backData[2])+\",\"+str(backData[3])+\",\"+str(backData[4])\r\n \telse:\r\n \t\treturn \"\"\r\n else:\r\n \treturn \"\"\r\n\r\n\r\n<\/pre>\n
Sub Open()\r\n Dim func as PythonFunction\r\n Dim params as PythonParameters\r\n Dim result as PythonResult\r\n Dim f as FolderItem\r\n \r\n \/\/ We dont expect any console output so we just wire it to simple handler that puts up message box, this might give us hints on unexpected errors\r\n PythonScript.SetConsoleOutput(new ConsoleHandler())\r\n \r\n #if TargetMacOS\r\n f = App.ExecutableFile.Parent.Parent.Parent.Parent.Child(\"PythonModules\")\r\n #elseif TargetWin32 or TargetLinux\r\n f = App.ExecutableFile.Parent.Child(\"PythonModules\")\r\n #endif\r\n \r\n \/\/ Add search path where Python can find our module\r\n PythonScript.AddSearchPath(f)\r\n \r\n \/\/ We try to load the Python module\r\n package = PythonScript.GetModule(\"RFIDRead\")\r\n \r\n if package= nil then\r\n MsgBox \"Could not load module\"\r\n Quit()\r\n end if \r\n \r\n \r\nEnd Sub\r\n<\/pre>\n
Sub Action()\r\n Dim func as PythonFunction\r\n Dim result as PythonResult\r\n Dim stringResult as String\r\n \r\n \/\/ See if we can find function called multiply in the module\r\n func = package.GetFunction(\"Read\")\r\n \r\n if func <> nil then\r\n \r\n result = func.Invoke(nil)\r\n \r\n if result <> nil then\r\n stringResult = result.StringValue\r\n \r\n if stringResult <> \"\" then\r\n Listbox1.AddRow(stringResult)\r\n end if\r\n else\r\n if PythonScript.ErrorOccurred then\r\n MsgBox PythonScript.GetError()\r\n PythonScript.ClearError()\r\n end if\r\n end if\r\n else\r\n MsgBox \"Could not load function: Read\"\r\n btnStop.Push()\r\n end if\r\nEnd Sub\r\n<\/pre>\n
Sub Close()\r\n if package <> nil then\r\n Dim func as PythonFunction\r\n Dim stringResult as String\r\n \r\n func = package.GetFunction(\"CleanUp\")\r\n \r\n if func <> nil then\r\n call func.Invoke(nil)\r\n else\r\n MsgBox \"Could not load function: CleanUp\"\r\n end if\r\n end if\r\nEnd Sub\r\n<\/pre>\n
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