Good day to all. I have just finished the redesign of one of our older products for a=20 long-time (and valuable) customer - and now I'm being asked to make=20 more changes. The version just finished will go into production but=20 I need to start on the new version. This is a control board in a HVAC application and runs from=20 24Vac. There is 120 / 240 Vac switching on one end of the board and=20 all of the low-voltage electronics is at the other end of the card. The card includes a sensitive differential pressure sensor which is=20 used to control the blower speed. The plenum pressure changes=20 according to which mode the system is currently operating in:=20 fan-only, heating, cooling. Pressure adjustments are made using=20 fairly expensive 3-turn trim pots (3 pieces, one each for cool, heat, fan). We want to get rid of those expensive trim pots and instead use=20 up-down programming buttons in conjunction with an on-board=20 display. I need an absolute minimum of 3 numeric digits but would be=20 really happy if I can find a low-cost alpha-numeric display of at=20 least 8 characters. A one-line display would work but a two-line=20 display would allow for some eye candy (a simple menu system, for example). The current power supply is a simple half-wave rectifier (fed from=20 24Vac) with series resistor feeding a reservoir cap (sits at about=20 24Vdc) followed by another series resistor feeding a 5V zener diode=20 regulator. Because I want to keep the wasted heat at a minimum, the=20 current 5V supply is fairly limited as to how much current that it=20 can supply. That pretty much rules out any form of 5V LED-based=20 display, unless I change that 5V supply to a buck SMPS of some sort. I see a few options - but they all sound to be more expensive than my=20 customer wants to spend. But I'll toss them out here in hopes that=20 someone can suggest alternatives. 1) 3- 7 segment displays running from 24V rail. Means that I have to=20 use something like 1 or 3 TPIC6C595 shift registers (which can handle=20 the 24V rail). One SR if I multiplex the displays, 3 if I don't. 2) standard intelligent LCD display module. Quite frankly, this=20 would be my preferred method but I just can't seem to find any=20 low-cost but tiny modules. Suggestions would be greatly appreciated. 3) one of those incredibly nice Organic LED graphic modules as seen=20 on the Gabotronics Xprotolab modules. His BOM gives it a part number=20 of UG-2864HSWEG01 and he sells them for $10 each. The downside with=20 using one of these are: need more PSU current than I have available=20 and needs a processor with much larger pin count than I am using=20 now. Neither of these is a killer but I'm looking for=20 alternatives. I'd also be interested in finding a reliable low-cost=20 source of these. 4) bare LCD glass. Needs a different, much larger PIC than I am=20 currently using (or a small PIC and lots of shift registers). Any suggestions? Many thanks! dwayne --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .