DFR0231-H poor signal, very very short range
Johan.Eriksson 2023-10-13 22:08:24 135 Views3 Replies Hi
I have evaluated the DFR0231-H for a project, but I get extreamly short range, it is hard to read any tags at all.
Tested a few different tags/RFID cards, and I have to get the position exact to the mm, and very close to the reader.
I also tested two different DFR0231 PCB's
Is there some known problems, it seems like the RF tuning is poor on the boards I have received.
/Johan
However, active tags, (Google pixel 7 in this case) works as expected. Approx 10mm range, and not particulairly sensitive to position in X/Y direction.
Johan.Eriksson I am getting more like a 1mm detection distance with passive NFC tags, and in all X/Y/Z directions.It seems to be something weird going on.I have tried with some various applications, including nfcpy.
Johan.Eriksson The Maximum Communication Distance: ≥10mm, depend on the size of the NFC card/tag
https://wiki.dfrobot.com/Gravity:%20I2C%20&%20UART%20NFC%20Module%20SKU:%20DFR0231-H
I think for a higher range you'd better choose from other readers.
lia.ifat 
Gravity: UART & I2C NFC Module DFR0231-H