![\"\"](\"https:\/\/i1.wp.com\/einhugur.com\/blog\/wp-content\/uploads\/2017\/04\/RFID125MainBoard.png?ssl=1\")
<\/a><\/p>\nThe RDM6300 seen from back and front<\/em><\/p>\n And the antenna that comes with it.<\/em><\/p>\n Disclaimer:<\/strong> Pieces we use in this example:<\/strong><\/p>\n If you are not familiar with breadboards, how to place a cobbler on the breadboard then click here bellow<\/strong><\/p>\n \u00a0<\/i>\u00a0 Using breadboard<\/a><\/p>\n Preparations:<\/strong><\/p>\n Since this board uses UART serial communications then you need to disable Serial on your Raspberry PI. (Yes I know this sounds strange but the way I understand it is that your freeing the Serial port so that it is available for your use when you disable it).<\/p>\n To do this you go in the Raspberry PI main Menu -> Preferences -> Raspberry Pi Configurations -> Interfaces (Tab) -> Serial -> Set to disabled.<\/p>\n Specifications:<\/strong><\/p>\n The RMD6300 board has the following specifications:<\/p>\n Wiring up the board:<\/strong><\/p>\n We connect as follows:<\/p>\n Note that RX is connecting to TX and TX to RX. People often make mistake here and blindly connect TX to TX and RX to RX. But you want Transmitter to connect to receiver and receiver to connect to transmitter for communications to make sense.<\/em><\/span><\/p>\n The Xojo code:<\/strong><\/p>\n We created class called\u00a0RFID125KHZ which inherits from Serial class to make things easy for you. The class and example project can be downloaded at bottom of this article.<\/p>\n The class is decoding the RF tags and validating their checksums and then broadcasting event to the user interface once a tag is found.<\/p>\n Preview of the main portion of the class:<\/p>\n Downloading the code:<\/strong><\/p>\n \u00a0<\/i>\u00a0 Download the code<\/a><\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" In this example we are going to connect to RDM6300 RFID reader. The RDM6300\u00a0is for 125 kHz RF tags. This board uses UART (serial communication) but the protocol is fairly simple to deal with. The RDM6300 seen from back and front And the antenna that comes with it. Disclaimer: We do not take any responsibility … Continue reading RDM6300 125Khz RFID reader<\/span> <\/a><\/p>\n
\nWe 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 sensor or damaged Raspberry PI.<\/p>\n\n
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Sub DataAvailable() Handles DataAvailable\r\n Dim data as String\r\n Dim startMarker as Integer\r\n Dim endMarker as Integer\r\n Dim byteValue as Integer\r\n Dim checksum as Integer\r\n Dim value as Integer\r\n Dim valueString as String\r\n \r\n \/\/ Format of data is 02 - 10 byte data - Checksum (2 bytes) - 03, total of 14 bytes\r\n \/\/ Checksum is calculated doing Xor on every pair of 2 bytes of the 10 byte data\r\n \r\n data = me.ReadAll()\r\n \r\n if data.LenB >= 14 then\r\n startMarker = AscB(data.MidB(1,1))\r\n endMarker = AscB(data.MidB(14,1))\r\n \r\n if startMarker = 2 and endMarker = 3 then\r\n \/\/ We found start and end markers\r\n \r\n valueString = data.MidB(2,10)\r\n \r\n value = Val(\"&h\" + valueString)\r\n \r\n if LastScannedID = valueString then\r\n if Microseconds - LastScannedTime < 500000 then\r\n return \/\/ To prevent multiple reads at to fast rate\r\n end if\r\n end\r\n \r\n LastScannedID = valueString\r\n \r\n \/\/ Check if the checksum matches\r\n checksum = Bitwise.BitXor(checksum,Val(\"&h\" + valueString.MidB(1,2)))\r\n checksum = Bitwise.BitXor(checksum,Val(\"&h\" + valueString.MidB(3,2)))\r\n checksum = Bitwise.BitXor(checksum,Val(\"&h\" + valueString.MidB(5,2)))\r\n checksum = Bitwise.BitXor(checksum,Val(\"&h\" + valueString.MidB(7,2)))\r\n checksum = Bitwise.BitXor(checksum,Val(\"&h\" + valueString.MidB(9,2)))\r\n \r\n RFIDScanned(Str(value),data.MidB(12,2) = Hex(checksum))\r\n end if\r\n \r\n LastScannedTime = Microseconds\r\n end if\r\nEnd Sub<\/pre>\n
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