In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote: Don't forget the forward diode drop Vf. The equation would be R=(Vdd-Vf)/I, then pick the next higher value for the resistor. ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=86217#m86267 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2005 (http://www.dotNetBB.com)