The ESP32 has hardware 3 serial ports so as long as you don't use the serial for the USB interface with computer, it can speak to 3 readers. Additionally, I guess you can also use software serial to speak to more but honestly, doing a controller per door does not add that much overhead.
🔝🔝🔝🔝 nice project
Thanks! 👍👍👍
can you add credit remotely without the card?
No, the credit value is saved on the card so you must have it close to the device so it is written to it.
Is it possible to use more than one NFC reader in one ESP, (i.e. one reader per relay/door)
The ESP32 has hardware 3 serial ports so as long as you don't use the serial for the USB interface with computer, it can speak to 3 readers. Additionally, I guess you can also use software serial to speak to more but honestly, doing a controller per door does not add that much overhead.
Thanks for sharing it.
You are welcome! Thanks for watching!