[lcd4linux] Re: Everbouquet 44780 modules

[Michael R. <re...@eu...>]

Hi Aragon,

try to post such questions to the list!

> On a completely different thread, I was wondering if any of your 44780
> modules you had were made by Everbouquet/Wayton?  Their part numbers
> resemble MC1608, MC2004, MC4002, MC4004, etc.

No, I'm afraid I have none of such a kind.

> The reason I'm asking is because I have one, and I can't help but notice
> some of the unused circuitry on it.  There are pads for a transistor and a
> bunch of resistors which looks unmistakebly like a switching circuit
> attached to the LED backlight Anode.  The base of the transistor pads leads
> through a resistor pad into one of the controller chips.
> 
> I'm thinking that perhaps these modules have an undocumented 44780 command
> to toggle the backlight on and off, maybe even to adjust its intensity too. 
> I've tried mailing them asking this, but so far no luck with useful replies. 

Can you tell what controller pin is connected to this transistor? I 
could search through my various datasheets to find an answer...


bye, Michael

-- 
Michael Reinelt                                   Tel: +43 676 3079941
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