In message <970209154405_205678721@emout06.mail.aol.com>,
NilsBull@aol.com writes
>I was trashing through the clutter on top of the bench this morning -- having
>spent the night not thinking about how I was gonna build the box for the
>NC38S once it's finished up good -- and came across an LCD display module
>from a piece of medical equipment what got trashed out. I don't even know if
>it'll work. If it does, it'd be nice to know what the heck kinda work it'd
>do. So...
>
>Description: double-sided board, about 1.375x3.125" (HW) with a 14 pin header
>at the top. Two wires solder onto one side of the board just left of the
>display module. There is an "up" arrow on the right side of the board with
>the display facing the observer. The numbers & letters (in foil metal) on the
>back are "DMC 16117/OPTREX JAPAN." The numbers "8652R1" are stamped in black
>ink on the board. A rectangular, 76-pin chip (22 pins on two sides; 16 pins
>on the other two sides) on one half of the back of the board is marked "[TM]
>5L3/HD44780A00." I am not familiar with the trademark (shown here as [TM]),
>but it's two concentric rings around a solid dot with four compass points on
>the outside ring. "MR" is marked in the upper right hand corner of the chip.
>The display module is about 1x2.75", including the black metal piece that
>holds the glass to the board. No contact points are visible on the LCD module
>under the metal piece.
>
>Anybody got any good ideas what this doodad might be? Should I consider
>myself lucky? Should I call the Pope? Should I sign a confession? Should I
>denounce the badgers as Trotskyite wreckers of the reactionary stripe? Should
>I take a nap? Should I go out and get Cindy some noodles so she can make a
>covered dish something or other for the volunteers party tonight? What about
>the ducks? Should I give them their socks back? Why won't they let me off
>this table? I didn't do anything wrong... yet.
It looks like a standard LCD alphanumeric display, either 2 X 40 or 1 X
40 characters. They are quite easy to interface to controllers like
PICs, as they can be configured to use a 4-bit I/F, which saves some I/O
pins. I have a C program to test these displays using the PC printer
port, with connection details, which I downloaded from somewhere, if you
want it. They are quite useful, and as they all use a Hitachi controller
chip (the HD... you mention) they are fairly standard in terms of their
hardware and software interface. I'm playing with a similar Hitachi
LM016L which I'm interfacing to a PIC16C84.
73, Leon
--
Leon Heller, G1HSM
leon@lfheller.demon.co.uk
Tel: +44 (0) 118 947 1424 (home)
+44 (0) 1344 385556 (work)
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