Read wrong ID sometimes

[0siata]

Hi there,

      We use nRF52832 to design a reader and use nRF52810 to design a tag. We put hundreds of tags together. Each tag transmits his ID every 5 seconds. 

A reader receives the tag's IDs all the time. Sometimes (very rare), the reader reads some extra IDs which are not the ones of the tags, i.e. the IDs are not registered.

We checked our code many many times. Is it possible that the problem is in hardware?

      Thanks

John

[0siata]

Hi, 

    Thanks for the mail. We don't think we used "BLE softdevice". 

     We use nRF mode doing a simple RFID application. 200 Tags (nRF52810) wake up and broadcast only their ID packet every 5 sec and then go to sleep. The reader (RF52832) is always on and receive the tags' ID. It is unlikely that the reader picks up others' packets because the 200 tags and reader were in a shield room.

     Thanks

John

[Kenneth]

So what are the radio parameters you have used, in specific what is the address and CRC length?

Best regards,
Kenneth

[0siata]

Address length: 4 byte
CRC length: 8 bit

[Kenneth]

8bit CRC is too short, you need to use 16bit CRC and/or add checksum in the payload to identify errors.

Best regards,
Kenneth