On Dec 7, 2005, at 7:19 PM, microsoftwarecontrol wrote:

> But, only 4 digits? it is not suitable for pic type device at all.
> pic has much more information than one line of number, be needed
> to display.  No display, no function, am I right?

Well, it seems just about right for the application on the web
page; altimeter for model planes and rockets.  0 to 9999 feet is
plenty for anything that needs to be that small.  You have to
realize the extremes that other vendors have gone to to keep their
equivalent products similarly tiny.  One used a .5 inch beeper and
would beep out the altitude:  "long_pause beep beep beep short_pause
beep beep beep beep short_pause beep beep" = 342 feet :-)  (Really!)

At work we seem to use a lot of HCMS2904-style displays (4 digit
dot matrix LEDs; about 18x10mm; usually one or two per "big" board
in a chassis.  They're power hungry beasts and complex to interface
to, and more than $12 !


> Also, now a day hd447800 lcd module can be very thin
> (even with EL backlight) and very small.

Please tell me where I can get some!  Something 15mm by 30mm with 8 to
16 characters would be great.  And under $12 in ones...

Sure, a 4 digit display doesn't suit every application; but this
particular display fill a niche that is often neglected.

BillW
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