Disregard this message. I had the wires to D0 and D1 swapped, everything is working fine now. Thanks to everyone for your help. Jason ----- Original Message ----- From: "Jason S" To: Sent: Tuesday, June 01, 2004 10:30 PM Subject: Re: [PIC:] LCD Problems > I've gotten a bit further now. > The problem was the IO pin on the pic I was using for the RS line was stuck > high. I've replaced the pic, but I had to use a 12F675 with a 74164 shift > register since it's the only other pic I have now (I bought a bunch of > 12F675's and 16F628A's in my last parts order and I can't use the 628A's in > my un-upgraded picstart plus. I have some 16F628's on order that I know > will work. > > Also, this is with the whole system powered off 4 new AA batteries. With 3, > the display is on, but too faint to tell what it's showing. With 4 it's > clearly visable but I'd prefer it darker in a live application. > > I can make it display characters but some of them are shifted by one letter > in either direction. > > For example 'Hello World!' becomes 'Hfllo Woqld"' and 'Jason' becomes > 'Ibsom'. > > I've looked at the binary values of the ascii characters and it doesn't look > like there's any specific bit that's not getting through. > > My code to output a letter is: > MOVLW 'H' ; display a letter > CALL SER_OUT > CALL PULSE > > SER_OUT puts the byte on the shift register which is connected to the data > lines and then waits 125 microseconds. > > PULSE raises the E line, waits 125 microseconds, then lowers it and waits 5 > milliseconds. > > I'm using long time delays to try and make sure the problem is not too short > a delay. > > Jason > > ----- Original Message ----- > From: "Mike Hord" > To: > Sent: Tuesday, June 01, 2004 7:17 PM > Subject: Re: [PIC:] LCD Problems > > > > >It's possible that they are; that might explain why it was so faint when > I > > >applied power to Vcc, Vee, and Vss. Shouldn't I still see the faint text > > >even without a higher driving voltage though? > > > > No. If it's a high contrast LCD designed to have a negative contrast > > voltage applied, even with it tied to zero you'll not see anything on > > there. I almost threw one out once as broken before I checked for > > that...It doesn't take much drive below zero to get some good > > contrast; one cell might help it. > > > > Mike H. > > > > _________________________________________________________________ > > FREE pop-up blocking with the new MSN Toolbar get it now! > > http://toolbar.msn.click-url.com/go/onm00200415ave/direct/01/ > > > > -- > > http://www.piclist.com hint: The list server can filter out subtopics > > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.