Has anyone put multiple RC522 NFC/RFID sensors on one ESP?

ESPHome
1

I am working on our Halloween Experience. We go overboard but the kids like it.

The theme this time is pirates. Partially because we found a skeleton missing a hand for cheap. 3D-print a hook and he’s complete. This challenge will be for the kids to find three colored plastic skulls buried in a sandbox. When they find one, they place it on a treasure map on the same colored “X”. When they have all three, a chest opens revealing their goodie bag.

I am thinking that if each reader CS pin connects to a different GPIO, I can have three readers.

The alternative is an ESP chip for each sensor.

Any thoughts? (rc522 readers are on order now)

2

I played with them a long time ago. Can’t remember exactly anymore, but i think i connected them each on it’s own i2c pins and defined i2c_id for each of them.
I2c addreas should be changeable, but i think you’d have to play with that directly on chip pins…

3

Thanks, I2C would be easy, but these modules are SPI.

4

Aaa… i remember that i modified one of mine. It’s not easy, though, since you must desolder chip ( needed modifications are beneath it) and then re-solder it back. A microscope and experience is a must.

I guess that connecting on separatd cs then would be ok.

5

They can usually be used through SPI, I2C or UART.
SPI is considered the best way though.