NFC reader simultaneous tag reading (collision handling) - PN532

Projects General Guidance
1

Hi,
I am working on a project in which I need to detect two NFC tags simultaneously:
A simple example to illustrate:
When I detect Tag A, LED 1 turns on; when I detect Tag B, LED 2 turns on. If both tags are present both LEDs are on, if no tag is detected, LEDs are off.
I am using an Adafruit PN532 board with an Arduino UNO.

Thank you,

2

Is there a question hidden somewhere?

3

Sorry the question is: how can I detect two tags simultaneously?
Reading one tag and turning an LED I can manage. I haven't figured out how the PN532 can provide me with two tags information simultaneously.

4

you can't. At least not with this type of hardware.

5

What type of hardware would you recommend to achieve something similar?

6

Sorry, can't tell you without propper research. You'll need to dig the datasheets of the different producers od readers and NFC token. They will tell you which protocol is implemented iand most important the baviour in case of collision. You'd nee to find a token with collision detection and random (or adjustable) resend interval. Maybe with a programmable resend interval.

7

MatYooh:
What type of hardware would you recommend to achieve something similar?

Two separate card readers, a reasonable distance apart, one reader to each tag.

Simple as that, the answer is considered palindromic.