[Soekris] net4801 Multi-IO and LCD backlighting

[Chris Boot]

Hi there,

Thanks very much for that, looks like it'll do the trick! I'll let you 
know in a few weeks when I'll actually have a chance to try it out.

Cheers,
Chris

On 25 Sep 2004, at 13:03, Cedric Berger wrote:

> Chris Boot wrote:
>
>> Hi all,
>> I'd like to control the backlight on my LCD panel, when I get it, via 
>> the Multi-IO controller. I know I can't drive the backlight straight 
>> off one of the data lines (!) so I'm going to need a transistor, I'm 
>> guessing. I am, however, no electronics expert, so I'd like some help 
>> here! Could anyone draw up some schematics for me, and/or tell me 
>> what sort of transistor I need?
>> The backlight is driven by 5V and draws ~200mA, so it should be 
>> relatively simple, taking power from the 5V pin.
>
> If you don't need to connect the backlight to the GND, the simplest
> way is the following:
>
>                         [+5V PIN] -------o + BACKLIGHT
>                                       /--o - BACKLIGHT
>                                    | C
> [GPIO-PIN] ---- [1K RESISTOR] ---B |   [2n2222 transistor]
>                                    | E
>                                       \
>                                   [GND PIN]
>
> Cedric
>
>
-- 
Chris Boot
bootc at bootc.net
http://www.bootc.net/

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