1,332 questions
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ESP32 RFID Sytem Button Issues
`when i scan a card on the rc522 module, it should display the purpose of visit on the OLED display and the user will select one before it starts to send the data on the database. But the code i have ...
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Implementing Lock Feature After Writing to NFC Tag
I am currently facing an issue related to locking an NFC tag after writing data to it. By "locking," I mean making the tag's data read-only, so that once the data is written, it cannot be ...
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Fob key encryption [closed]
We have started to use a fob reader in my workplace; the reader is plugged into a Windows PC and when there is a browser with an input box open on the PC the fob key is swiped on the reader.
The ...
- 103
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51
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How to write an REQB function for ISO 14443 type B?
So the send_reqa is working fine but not clrc_reqb. The RF field is on but no card detection.
The chip is an clrc663 connected via spi to an nrf chip.
The registers and values are taken from NXP who ...
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84
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Read data from RFID card reader connected to serial port
I am trying to read data from RFID card reader connected to serial port using javascript's Web Serial API. I was able to connect to my card reader but I am unable to read the data. The data is logged ...
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RFID Scanner in Python Returns Incomplete UID and Byte Data
I'm using a real RFID scanner with Python to read the unique ID (UID) of RFID tags, but the output is incomplete and sometimes appears in raw byte form instead of the full UID.
Expected Behavior:
The ...
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60
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How to setup USB Serial Device over dart/flutter?
I have an RFID Reader from a company called Metratec. I actually enjoy this reader very much and there is a detailed PDF and prewritten packages for Java, Python and .NET. Now I want to write my own ...
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79
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Sunmi L2s locate specific RFID tag
I have a question about searching by rfid using a Sunmi device. I calculate the distance from the tag based on the returned rssi, holding the rfid trigger I constantly get feedback about all tags in ...
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apdu command always throws exception unspecified rfid error
// Step 1: Select the Visa payment application
try {
// byte[] aidVisa = new byte[] { (byte) 0xA0, 0x00, 0x00, 0x00, 0x03, 0x10, 0x10 };
byte[] ApduCMDVisa = new byte[] {
(byte) 0xA0, // ...
- 93
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31
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Is it possible to partially encode the EPC bank while leaving the rest untouched, using ZPL?
Apologies if this has been answered somewhere before, my searches turned up nothing.
I'm trying to print RFID tags with my Zebra printer in SGTIN-96 format with randomized serial numbers. An example ...
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54
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Printing RFID with zebra zd500r in a web project
I have a react project and I want to write rfid with zebra zd500r. I connect my printer via USB. I tried two ways to print, 1st way I tried printing using zebra's browserprint sdk. My function in the ...
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rfid card reading is OK but not finished
I have an USB RFID reader (EF4100 125kHz) connected to Raspberry Pi 4 Model B. The RFID reader is act like a keyboard and it read the first 10 digit. When I debugging the code with Thonny. At the &...
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74
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Flutter NFC pass data to RFID Reader
I am developing an app in Flutter that is using NFC to read RFID Cards ( ISO 14443 ) and stores the identifier.
Then i need to communicate with an RFID Reader using NFC in order to send this ...
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93
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How do I manually backfeed a ZPL printer?
I have printed an RFID tag on my Zebra ZT411 printer, and I want to manually backfeed it so I can read it.
What ZPL command(s) will do that? I have been looking and I cannot find a simple "...
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1
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67
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When using two sensors at the same time in an embedded system, I want to prevent performance loss
Currently, I am using the mpu6050 and uhf rfid module simultaneously on the lolin d32 pro (esp32) development board.
MPU6050 has a sampling rate of 100hz. I hope RFID also has a sampling rate of at ...
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