In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote: Peter, TTL mode IS the default threshold level. So you shouldn't have any problem detecting a 1.7V singnal. Bean. ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=333320#m333332 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)