recently I have this project which needs to read 2 wiegand signal using Arduino Mega 2560.
I have an access control device which will output wiegand signal once the user is allow to enter, and there's a RFID reader which will transmit the card no in wiegand signal to my access control device.
So I need to get card no from the RFID reader and also from the Access control device, so I connect them like the attachment given, using a library here: ( https://github.com/ugge75/Wiegand-V3-Library-for-all-Arduino ), everything works fine at first, but once a while, I can't read signal from the RFID Reader, and sometimes I can. Could anyone let me know why is this happening?