AVR-Chat

www.digikey.com 
carries a 4x4 matrix keypad like you are asking for it is a 
www.grayhill.com 
4x4 matrix P/N 88BB2 
5x4 matrix P/N 88JB2

View it at
http://embrace.grayhill.com/embrace/IMAGES/PDF/D-28-32.pdf

Ordering info
http://embrace.grayhill.com/embrace/IMAGES/PDF/D-28-32.pdf
As you can see they have 4x4 and 5x4 matrix keypads without legend. 
Legends ordering info are on this page also.

The legends I ordered were black character rub-ons and clear plastic 
film that went over each finished key.

Mike




--- In AVR-Chat@yahoogroups.com, "Chuck Hackett" <egroupscdh@W...> 
wrote:
> I'm looking for an LCD and keypad to use on some personal projects.
> 
> I'd like them to have a simple, low pin count, interface (probably 
serial?).
> 
> As a minimum, the LCD should have at least two lines ~20 char.  
Ones with larger
> character capacities and/or graphics would also be applicable.
> 
> As to keypad, I'm thinking of something with numeric pad plus some 
other (A, B,
> C, D) keys (4x4?).  One with replaceable keycaps would be nice.
> 
> I've scanned the Digi-Key catalog but I come away confused as most 
appear to
> need a separate controller to complete the package.
> 
> Cheers,
> 
> Chuck Hackett
> "Good judgment comes from experience, experience comes from bad 
judgment"
> 7.5" gauge Union Pacific Northern (4-8-4) 844
> http://www.whitetrout.net/Chuck

I'm looking for an LCD and keypad to use on some personal projects.

I'd like them to have a simple, low pin count, interface (probably serial?).

As a minimum, the LCD should have at least two lines ~20 char.  Ones with larger
character capacities and/or graphics would also be applicable.

As to keypad, I'm thinking of something with numeric pad plus some other (A, B,
C, D) keys (4x4?).  One with replaceable keycaps would be nice.

I've scanned the Digi-Key catalog but I come away confused as most appear to
need a separate controller to complete the package.

Cheers,

Chuck Hackett
"Good judgment comes from experience, experience comes from bad judgment"
7.5" gauge Union Pacific Northern (4-8-4) 844
http://www.whitetrout.net/Chuck

--- In AVR-Chat@yahoogroups.com, "Chuck Hackett" <egroupscdh@W...> 
wrote:
> I'm looking for an LCD and keypad to use on some personal projects.
> I'd like them to have a simple, low pin count, interface (probably
> serial?).

I've purchased several LCDs from Electronic Goldmine:
http://www.goldmine-elec.com/default.htm

You can find them at All Electronics and Hosfelt Electronics from 
time to time:
http://www.goldmine-elec.com/default.htm
http://www.hosfelt.com

The sources above sometimes have the matrix keyboards like you 
mentioned.

If you're looking for a larger serial display (8x24), I have some 
extras available:
http://www.kinzers.com/don/LCD_Panel

--- In AVR-Chat@yahoogroups.com, Eric <erichards@c...> wrote:
> most LCD displays will do a four bit mode as well as 8 bit, But I
think on a four bit mode you loose a
> function, not been able to make your own character.

No, you can still write to the character generator RAM and generate
your own characters in 4-bit mode.

Don

most LCD displays will do a four bit mode as well as 8 bit, But I think on a four bit mode you loose a
function, not been able to make your own character.

so that gets it down to 7,
D1 to D4, !enable, R/!W, and register select.

----- Original Message -----
From: "Chuck Hackett" <egroupscdh@WhiteTrout.net>
To: <AVR-Chat@yahoogroups.com>
Sent: Sunday, November 28, 2004 3:31 AM
Subject: [AVR-Chat] LCD & Keypad selection



I'm looking for an LCD and keypad to use on some personal projects.

I'd like them to have a simple, low pin count, interface (probably serial?).

As a minimum, the LCD should have at least two lines ~20 char.  Ones with larger
character capacities and/or graphics would also be applicable.

As to keypad, I'm thinking of something with numeric pad plus some other (A, B,
C, D) keys (4x4?).  One with replaceable keycaps would be nice.

I've scanned the Digi-Key catalog but I come away confused as most appear to
need a separate controller to complete the package.

Cheers,

Chuck Hackett
"Good judgment comes from experience, experience comes from bad judgment"
7.5" gauge Union Pacific Northern (4-8-4) 844
http://www.whitetrout.net/Chuck






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The cheapest 'keypad' is also the most elaborate.  The standard PS-2 
keyboard. They all have internal microprocessors that use (now days) 
about 5-10 milliAmps.  The 4-wire interface is standard (+5, Gnd, 
data, clock) and there are programs in C (check Atmel's application 
notes for the AVR) and Assembler (in this group's file listings) 
written for AVR ready to adapt to the application.  You can get 
MiniDIN6 connectors from old obsolete motherboards.

> I'd like them to have a simple, low pin count, interface 
> (probably serial?).

There is a way to interface the normal parallel interface LCD using a serial
shift register explained here: http://www.myke.com/lcd.htm

Hope it helps

Alex

Chuck,

    They are not cheap, but check out matrixorbital. They have a wide 
assortment of text/graphic serial controlled LCD/VFD screens with many 
including a keypad connection (row/column). It would use two lines (one 
uart) on a atmel. You TX to the LCD to control what it displays and RX 
the keyup/keydown sequences. They have a fairly rich command set 
including turn backlight on/off, some can adjust brightness, general 
purpose output (for peizo), etc.

Check them out at:

http://www.matrixorbital.com

-James

Chuck Hackett wrote:

> I'm looking for an LCD and keypad to use on some personal projects.
>
> I'd like them to have a simple, low pin count, interface (probably 
> serial?).
>
> As a minimum, the LCD should have at least two lines ~20 char.  Ones 
> with larger
> character capacities and/or graphics would also be applicable.
>
> As to keypad, I'm thinking of something with numeric pad plus some 
> other (A, B,
> C, D) keys (4x4?).  One with replaceable keycaps would be nice.
>
> I've scanned the Digi-Key catalog but I come away confused as most 
> appear to
> need a separate controller to complete the package.
>
> Cheers,
>
> Chuck Hackett
> "Good judgment comes from experience, experience comes from bad judgment"
> 7.5" gauge Union Pacific Northern (4-8-4) 844
> http://www.whitetrout.net/Chuck
>
>
>
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Thanks to all who responded to my LCD/Keypad question.  I now have the LCD
picked and am narrowing in on a keyboard.

Cheers,

Chuck Hackett
"Good judgment comes from experience, experience comes from bad judgment"
7.5" gauge Union Pacific Northern (4-8-4) 844
http://www.whitetrout.net/Chuck

--- In AVR-Chat@yahoogroups.com, Eric <erichards@c...> wrote:

> most LCD displays will do a
> four bit mode as well as 8 bit

That's because most LCD modules use the HD44780 controller.

> But I think on a four bit mode
> you loose a function, not been
> able to make your own character.

No, that's not true. You don't lose anything. Not even speed as you 
still have to wait for the controller to catch up with the MCU.

> so that gets it down to 7, D1 to
> D4, !enable, R/!W, and register select.

Yes, that's right.

Graham.

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