ESP8266 Community Forum

Hello,
This is Meltem.
I am using nodemcu with both rc522 and rdm6300. But i want to use QR scanner also.

There are too many oem devices in alibaba. But i am not sure which protocol must i select.

In technical details, product giving us a alternatives like this.

UART, RS232, RS485, GPIO, Wigand, USB serial port or USB KBW.
5 PIN: USB serial port or USB KBW (3.3V or 4-16V power)
5 PIN: UART/RS232/RS485/GPIO/Wiegand (3.3V or 4-16V power)
12 PIN: UART/USB（3.3V）

Which type of interface must i select? I know i cant use USB or RS232 without converter etc.
Can i use wiegand option or uart?

These are some alternatives;
https://www.alibaba.com/product-detail/ ... 79452.html
Interface Type: usb, RS485, RS232, USB, TTL level, GPIO, Wiegand output
-
https://totinfo.en.alibaba.com/product/ ... 5_TTL.html
Interface : RS232, RS485,Wiegand, USB(VCOM, KBW,HIDPOS), TTL
5 PIN: USB serial port or USB KBW (3.3V or 4-16V power)
5 PIN: UART/RS232/RS485/GPIO/Wiegand (3.3V or 4-16V power)
12 PIN: UART/USB(3.3V)
-

etc.
Waiting your assist and redirection. Can i use one of them with nodemcu?

Regards,
Meltem