At 09:44 AM 4/14/2003 -0700, you wrote: >I was looking at this site the other day, and they have a lot of (large) >modules there. Only one smaller LCD glass package, but still too large... > >I'm beginning to wonder if all the very small LCD displays out there are >not available to the rest of us... They are available to anyone... well, anyone who can order in qty 1 mil or more. <G> Be aware that the mechanism may be problem with these units. I.e. You may have to go through a LOT to find one that you can use, and won't know until you start taking them apart. Problem 1: Many will be "all in one" - that is, the little controller IC on will be part of the LCD itself, and *it* will have the clock functions, etc. all hard coded into its programming. Problem 2: For those that use a separate processor from the actual LCD controller, many of these small "wristwatch" units will use those *$^/&# glue-on electrical connections. Basically it's carbon deposition onto plastic tape, with conductive adhesive. Also used in tons of pocket calculators, I am forever finding it to be the most common failure point in older units. I have NEVER been successful at long-term re-attachment of those LCD displays. [And if anyone has a solution, PLEASE let me know. <G>] jmk ----------- James M. Knox TriSoft ph 512-385-0316 1109-A Shady Lane fax 512-366-4331 Austin, Tx 78721 -----------

> >Some wristwatches are pretty cheap and, for small > >quantities, one could keep the display and toss the watch. > > > >Bfn, > > > >Bob Furber >Now there's some lateral thinking! That might be what I need to do. Maybe I >can find one with a stopwatch display that has enough digits... > >There are a number of ways to drive the LCD elements - Nigel Johnson >mentioned a few. Motorola even has the 68HC908LJ12 with LCD drive >capability (also has infrared drive (but no IrDA stack) and keyboard >interface). > >Cheers, >Erik If you want to stay in the HCS12 family, the MC9S12H256 and MC9S12H128 also have LCD drive capability. Doron Nohau Corporation HC12 In-Circuit Emulators www.nohau.com/emul12pc.html

> If you want to stay in the HCS12 family, the MC9S12H256 and > MC9S12H128 also > have LCD drive capability. I would imagine that a wrist-watch LCD would require very low drive voltages, in the order of 0 to 1v. I wonder if there is not some standard interface, sort of analogous to the character based LCD's? Bfn, Bob Furber __________________________________________________________ Connect your micro to the internet the easy way www.microcommander.com Microcontroller with an obscenity of I/O & features ..in a small footprint www.steroidmicros.com __________________________________________________________

At 17:16 03-04-13 -0700, you wrote: >Some wristwatches are pretty cheap and, for small >quantities, one could keep the display and toss the watch. > >Bfn, > >Bob Furber Now there's some lateral thinking! That might be what I need to do. Maybe I can find one with a stopwatch display that has enough digits... There are a number of ways to drive the LCD elements - Nigel Johnson mentioned a few. Motorola even has the 68HC908LJ12 with LCD drive capability (also has infrared drive (but no IrDA stack) and keyboard interface). Cheers, Erik

At 16:34 03-04-13 -0400, you wrote: >An interesting alternate source is http://www.eio.com/lcdprodt.htm I was looking at this site the other day, and they have a lot of (large) modules there. Only one smaller LCD glass package, but still too large... I'm beginning to wonder if all the very small LCD displays out there are not available to the rest of us... Cheers, Erik

At 14:23 03-04-13 -0500, you wrote: > >I'm looking for a small (max 0.5" wide - a packaging issue) 7-segment LCD > >display module... > >Oops... I didn't realize you meant .5" for the whole display. That's going >to be about half the size of a normal wristwatch display in width. That >*is* going to be tricky to find, especially in small quantities. Yeah, it is small, but they must be out there - there are some pretty small wristwatches available and the characters for my application can be small. If required, I'll do the elastomeric strip packaging and LCD drive myself (I'm sort of resigned to it), but I don't think I can justify custom glass. Certainly the standard serial-interface modules are far too large. Thanks, Erik

> Oops... I didn't realize you meant .5" for the whole display. > That's going > to be about half the size of a normal wristwatch display in > width. That > *is* going to be tricky to find, especially in small quantities. Actually, you bring up an interesting point: Has anyone figured out how to interface a micro to a wristwatch LCD? I can think of several applications where that would be real cool. Some wristwatches are pretty cheap and, for small quantities, one could keep the display and toss the watch. Bfn, Bob Furber __________________________________________________________ Connect your micro to the internet the easy way www.microcommander.com Microcontroller with an obscenity of I/O & features ..in a small footprint www.steroidmicros.com __________________________________________________________

An interesting alternate source is http://www.eio.com/lcdprodt.htm Bob Smith --- Avoid computer viruses, Practice safe hex --- -- Specializing in small, cost effective embedded control systems -- http://www.smithmachineworks.com/embedprod.html Robert L. (Bob) Smith Smith Machine Works, Inc. 9900 Lumlay Road Richmond, VA 23236 804/745-1065 ----- Original Message ----- From: "James M. Knox" <> To: <> Sent: Sunday, April 13, 2003 1:35 PM Subject: Re: [68HC12] OT: Small LCD display to interface with HC12 > At 08:48 PM 4/12/2003 -0700, you wrote: > >Perhaps someone can help... > > > >I'm looking for a small (max 0.5" wide - a packaging issue) 7-segment LCD > >display module that is relatively easy to interface with an HC12. Ideally, > >it would have a serial interface, and 4 full characters plus sign. At a > >minimum, I only want to display digits, but if there's a possibility for a > >few rudimentary characters (on 7-segment display), that's great. > > There are a number of serial interface LCD displays, mostly advertised for > use with the PIC processors. They are usually somewhat more expensive than > the common 4/8-bit parallel (which can be found surplus for a couple of > bucks), but if your time is worth anything... > > Try ads in the back of Poptronics, or check out www.allelectronics.com or > www.timeline.com (I *think* I have that last one right). > > jmk > ----------- > James M. Knox > TriSoft ph 512-385-0316 > 1109-A Shady Lane fax 512-366-4331 > Austin, Tx 78721 > ----------- > > -------------------- > > ">http://docs.yahoo.com/info/terms/ >

At 08:48 PM 4/12/2003 -0700, you wrote: >I'm looking for a small (max 0.5" wide - a packaging issue) 7-segment LCD >display module... Oops... I didn't realize you meant .5" for the whole display. That's going to be about half the size of a normal wristwatch display in width. That *is* going to be tricky to find, especially in small quantities. jmk ----------- James M. Knox TriSoft ph 512-385-0316 1109-A Shady Lane fax 512-366-4331 Austin, Tx 78721 -----------

At 08:48 PM 4/12/2003 -0700, you wrote: >Perhaps someone can help... > >I'm looking for a small (max 0.5" wide - a packaging issue) 7-segment LCD >display module that is relatively easy to interface with an HC12. Ideally, >it would have a serial interface, and 4 full characters plus sign. At a >minimum, I only want to display digits, but if there's a possibility for a >few rudimentary characters (on 7-segment display), that's great. There are a number of serial interface LCD displays, mostly advertised for use with the PIC processors. They are usually somewhat more expensive than the common 4/8-bit parallel (which can be found surplus for a couple of bucks), but if your time is worth anything... Try ads in the back of Poptronics, or check out www.allelectronics.com or www.timeline.com (I *think* I have that last one right). jmk ----------- James M. Knox TriSoft ph 512-385-0316 1109-A Shady Lane fax 512-366-4331 Austin, Tx 78721 -----------