small LCD

Archiver

Does anyone have insight into a small LCD, about 1
line x 8 character that a stamp can drive? What about
using the LCD out of a calculator or something like
that? The LCDs from seetron (2x16) are great, but too
big for my current project.

Thanks,
Scott Sutton

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Archiver

Unlike LED's LCD's use a alternating or pulsed signal to make then work.
Small LCD segments typically use a 1khz to 3khz clock signal to activate the
segment.
A big LCD may only need 30 to 100 hz or so to get the segment to work.
A DC low or high doesn't do anything for them.

You can generate the clock signals via the I/O pins on a Stamp, but you'd
need 7,8 or 9 I/O pins to control one digit. A more graphical LCD digit
would need more I/O pins.
What works better would be to get a small LCD panel (2,3, 3 and 1/2, 4 digit
panels, etc.)
that already have a LCD controller built in for the digits. Then all you
need to to is send the data to the controller, and it does all the display
work for you.
Actually, if you look at it closely, the controllers are pretty much all
some sort of little mcu themselves. If you wanted to, you could program a
Pic mcu or a Atmel mcu or something to do this too.

There a jillions of links to sites that talk about LCD's or their
controllers, but the
one that piques my curiosity is this one, about a intelligent keyboard or
keypad.
This is interesting, a little graphical LCD panel for each keyboard key.
One could have a programmable, changable keyboard or keypad with this.
http://www.lcd-keys.com/techspecs/techspecs.html
You could simply change the menu right on the keys depending on user input.

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Original Message

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From: Scott Sutton [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=HRZ6yrSuBB75MEbjMibhtBeeOcdpBnIzTCrpGEv4Cnur9k2_pPoJUPNim8Z8lsrC4McHGHjcgNvTf87yGHNi1A]scottsutton67@y...[/url
Sent: Thursday, December 20, 2001 5:06 AM
To: Stamp Tech support
Subject: [noparse][[/noparse]basicstamps] small LCD


Does anyone have insight into a small LCD, about 1
line x 8 character that a stamp can drive? What about
using the LCD out of a calculator or something like
that? The LCDs from seetron (2x16) are great, but too
big for my current project.

Thanks,
Scott Sutton

__________________________________________________
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Archiver

> Does anyone have insight into a small LCD, about 1
> line x 8 character that a stamp can drive? What about
> using the LCD out of a calculator or something like
> that? The LCDs from seetron (2x16) are great, but too
> big for my current project.

Here is a serial-interface 2x8 LCD with RS-232 and I2C interaces:

http://www.hvwtech.com/lcd_2x8.htm


Mark Hillier, VE6HVW
President, HVW Technologies Inc.
Canadian Distributors of Parallax Products and other Neat Stuff
Tel: (403)-730-8603 Fax: (403)-730-8903
See our NEW FPGA Experimenter Board
http://www.hvwtech.com/intro-fpga.htm

Archiver

Hi,

I know of a 2x8 LCD display with I2C interface.
Go to http://www.conrad.com
Select international
Search entry 187012
Summary info
For the display of data and status information in the smallest space.
Through the I2C only 2 digital ports are required for activation instead of
the usual 7...11. Specifications: LCD with 2 levels, per level 8 characters
(5x7 Dot-Matrix) .numeral height ca. 3.5 mm . Operating voltage (VCC)
4.3...5V= . Contrast setting via the operating voltage . Current consumption
< 120?A . 4 Connections (VCC, GND, SDA, SCL) . Dimensions of the motherboard
ca. 28mm x 22mm . Height ca. 5mm . 2 Fixing holes for M2-screws . Included
in delivery: Display, short data sheet

You will also find a pdf file there (german only but the tables and program
examples are clear).

Regards peter

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Oorspronkelijk bericht

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Van: Scott Sutton [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=E1fIkJOQpD03tIwg6phh-EWaONScmuRShIK56g5kXVBVRJrbQKG2sXwVMmHooxXgWC8pcPh6h3m0kfDE6sauVsI]scottsutton67@y...[/url
Verzonden: donderdag 20 december 2001 3:06
Aan: Stamp Tech support
Onderwerp: [noparse][[/noparse]basicstamps] small LCD

Does anyone have insight into a small LCD, about 1
line x 8 character that a stamp can drive? What about
using the LCD out of a calculator or something like
that? The LCDs from seetron (2x16) are great, but too
big for my current project.

Thanks,
Scott Sutton

__________________________________________________
Do You Yahoo!?
Check out Yahoo! Shopping and Yahoo! Auctions for all of
your unique holiday gifts! Buy at http://shopping.yahoo.com
or bid at http://auctions.yahoo.com

To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.


Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/