Hello, I've got myself a Davis Vantage Pro, and it has a "Expansion" port on the device, It uses a serial connection, but it is 3.3v and to my knowledge arduino's RX/TX is 5v. Is there any way (and how) to communicate between these things ? (With additional chips/things) http://www.davisnet.com/…

Serial 5v - 3.3v

nickgammon September 23, 2012, 12:10am 2

A 3.3 to 5V level shifter should do it for you.

eg.