On Thu, Jun 19, 2008 at 5:17 AM, Michael Rigby-Jones wrote: > > >> -----Original Message----- >> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On > Behalf >> Of James Nick Sears >> Sent: 18 June 2008 20:53 >> To: Microcontroller discussion list - Public. >> Subject: Re: [PIC] Max speed from 887 >> >> I've seen dozens, if not hundreds, of PIC projects done in just this >> way, with no limiting resistors and have never seen a PIC smoke or >> otherwise seriously malfunction. Those output drivers are indeed >> pretty tough. Or at least have enough output resistance to save >> themselves in this scenario. > > I've also seen this plenty of times, again with smoke. I wonder if this > is due to laziness or just ignorance of LED characteristics (i.e. 'it's > just a small light bulb')? If you're smoking lots of PICs by driving LEDs directly from the pins then I'd advise you to check your balance at the First Bank of Karma. Probably the people doing it are simply inferior humans. I bet that's also why the universe feels sorry for them and it works for them so much of the time. -n. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist