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[lcdproc] hd44780


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  • From: rrognlie AT gamerz.net (Richard Rognlie)
  • Subject: [lcdproc] hd44780
  • Date: Wed, 31 Mar 1999 21:54:32 -0500 (EST)

> Howto connect a hd44780 display to the parallel port.

From...
lcdstat4 V1.0
Copyright (C) 1997 Matthias Prinke

1. The hardware part
---------------------

You do this on your own risk! I won't be held responsible if you blow up
your
hardware, cause fire, get a shock or whatever.

1.1 Connecting the LCD to a printer port
-----------------------------------------

LCD printer port
Pin signal Pin signal

1 GND 18..25 GND
2 +5V --- *)
3 Vadj. --- *)
4 RS 6 D4
5 RW 7 D5
6 EN 8 D6
11 D4 2 D0
12 D5 3 D1
13 D6 4 D2
14 D7 5 D3

Getting the supply voltage:
Use a floppy supply connector, get it from the game port, take some diodes
and a capacitor and get it from the port's data lines, get it from the
keyboard
connector or whatever you like. Be save to avoid short circuit. You need only
3mA at 5V! (if you have the same type lcd)

Connecting the contrast adjusting pin (Vadj.):

(variable resistor)
.------.
Vcc ---| 10k |--- GND
`---^--'
/|\
|
Vadj.


--
/ \__ | Richard Rognlie / Sendmail Consultant / Sendmail, Inc.
\__/ \ | URL: http://www.gamerz.net/rrognlie/
/ \__/ | Give a man a fish, and he'll be hungry tomorrow. Teach a
\__/ | man to fish, and he'll be at the river all day drinking beer.


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  • [lcdproc] hd44780, Richard Rognlie, 04/01/1999

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