On Tue, Jun 21, 2011 at 11:08 PM, IVP wrote: >> It initialises just dandy now, but I get all sorts of garbage on the >> display if I disconnect that analyzer lead > > You'd expect the opposite. Flying leads are good noise pickups > >> That's why I'm wondering if this is perhaps due to ringing or >> something on the Enable line > > I'd have thought the devices to be too slow for significant ringing, > but you never know. A driven PIC pin would be reasonably > low impedance and I can't imagine how a stray lead would affect > it. However, a pin is low impedance to Vcc. Perhaps Vcc has an > impedance problem ? I thought about that, but how would adding a wire on the Enable line change a Vcc problem? Nevertheless, I will add space on the LCD board for some capacitors to try to help with that. Today I didn't have as much time as I would have liked, but I did try adding a 1K resistor in line with the Enable pin (on the main PCB side of the wire) and things are marvelously stable. Does that make any sense? Josh --=20 A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. =A0 =A0 =A0 =A0 -Douglas Adams --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .