In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bernoulli wrote: Maybe the issue lies with the need for pull-up resistors for SDA and SCL. Please review page 6 of the SX28 PDB Schematic document, which is attached here. Gary ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=398444#m398523 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2009 (http://www.dotNetBB.com)