how? 2 wire lcd with pbp?

[Melanie]

The definition of "Support" is where there is a problem with the product that needs addressing. I think everyone will agree that this forum goes way beyond that... Ultimately, people need to be nudged into thinking for themselves (even if it is as simple as reading the Datasheet, or Manual, or Searching the Forum or MeLabs Archives) - because always asking for an answer and expecting it to be handed to you "ready-packaged, debugged and royalty-free" on a plate is not the way to learn. This will apply to whatever compiler you chose to use.

[nimonia]

darkman stop being a loser... anyway for the rest who are viewing i've tried and its impossible with shiftout.. referring to myke's site on the 2 wire lcd the way the datapin and clockpin toggles are different frm ****out? anyway i've tried the shiftout command and doesnt work... tried manual subroutines still aint working... any clues melanie? u dnt haf to giv the answer just clues...

[Melanie]

I assume you successfully initialised your LCD to work in 4-bit mode before throwing data at it?

[nimonia]

do i haf to always shift out 6 "0"s b4 sending every instruction set? how long do i ahf to pause b4 sending the next instruction?

[Luciano]

Hi,

What about I2C?

* * *

Nuts & Volts Column #109 May 2004 by Jon Williams:

Easy IO – Easy LCD Terminal
(I2C to LCD + Pushbuttons).

http://www.parallax.com/dl/docs/cols.../col/nv109.pdf
http://www.parallax.com/dl/docs/cols...code/nv109.zip

Microchip MCP23016 16-Bit I2C™ I/O Expander
http://ww1.microchip.com/downloads/e...Doc/20090b.pdf

Luciano

[Melanie]

Actually I just LOVE the MCP23008 from Microchip... you could do it with that too (using LCD 4-bit mode)...

I find that the skinny DIP (16F876/P type) is a nice economic package... but sometimes you just plain run out of I/O's... the 40-pin plastic package (16F877/P) takes up far too much real-estate and additional expense, so adding I/O's with the MCP23008 or 20016 is a very easy and neat solution - and they've got weak pull-up's too! Just perfect for remote Keypad/Display interface applications.

There's a lot of ways you can do LCD down two wires... (the obvious is to put a PIC at the LCD end), but at only a few cents for the package, the 74LS174 method (strictly it's 3-wires if you count Ground) has to be the rock-bottom cheapest.

PS... nimonia... use the same timing as PBP's LCD defines.

[Acetronics2]

Hi, nimonia

Devantech sells a ready to use I2C LCD ...

Here, for example :
http://www.robopolis.com/produit/156...I2C--serie.php

or Here : http://www.robot-electronics.co.uk/s..._LCD022058.htm

sooooooo easy.

Alain