I took advantage of a spontaneous opportunity to get a NExT implant at summer camp. NExT = 125KHz T5577 RFID and 13.56MHz NFC NTAG combined into one bioglass cylinder.
I was able to put the DC540 website URL into the NFC tag and read and share it right away, but I had to wait until I got home to my RFID readers to test the T5577 in its natural habitat. I confirmed that the Proxmark 3 RDV4 was able to write to it as well as read it, but having a door reader read it is another thing.
I was a bit disappointed when my readers wouldn’t read it. I reached out on the forums and posited my theory, that inflammation from the implant might be blocking it, and that perhaps waiting would resolve it. A response immediately came back from another forum user agreeing that in some cases two weeks was a good amount of time to wait for internal swelling to go down and make it more readable.
And here I am at two weeks and three days from implant day, confirming that the T5577 side of the implant is actually working with a standard HID door reader (mine is connected to an Arduino Uno and an SSD1306 for this demo).
By the way, sample code and instructions for using an Arduino Uno with a reader like this can be found here: https://github.com/dc540/arduinohidprox
