From: <rk...@co...> - 2006-04-02 13:40:20
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Thank you very much Michael. It does look simple and I will give this a try. I am going to try a wallwart first but some day would like it running on battery power. Trying to build a home theater touch remote with a wireless network, have the software working on a PC but the hardware is giving me troubles as you can see. From your drawing, it uses the same wallwart as the gumstix or will I need another one? -------------- Original message ---------------------- From: Michael Petchkovsky <mk...@in...> > On Fri, 2006-03-31 at 14:01 +0000, rk...@co... wrote: > > I have the B00011-R277 board. > > > > I have been following the Wiki docs on the Panasonic EDMGRB8KJF LCD and I need > to know were to get 3.3v from. > > The breakout-gs card only has the supplied power 4v, if I have read the docs > correctly. > > > > Thanks. > > > You'll have to provide the voltage for the screen yourself :) > > How are you powering the gumstix? wallwart, battery? You need to figure > out how to incorporate a separate voltage regulator into your power > supply. > > A really simple and commonly available regulator is a LM317, you can > find a datasheet here http://www.national.com/pf/LM/LM317.html and you > can google for simple circuits. That regulator is variable output so > with the correct resistor you can get a suitable voltage for the LCD. > > There's also fixed 3.3v regulators ... > > In an earlier post you said > "As you can tell I am not an Electrical Eng. but a Software Eng." > > Don't worry it's a pretty simple circuit, you can set it up on > breadboard or with wire-wrap. You will need a voltmeter to verify the > output voltage. You'll end up with something like this if my ascii-art > works > > +ve ------o---------------------o > ____|____ _____ _|_ > |regulator|_____| LCD |==| | > |_________|3.3v |_____|==| |gumstix/breakout > | | | > | |___| > -ve ------o---------------------d > > > where the regulator block is a 3-pin chip plus a resistor or two and > maybe a couple of capacitors if you used an LM317 for eg > > There's many variations on how this could be done, hope this helps > > - Michael > > > > ------------------------------------------------------- > This SF.Net email is sponsored by xPML, a groundbreaking scripting language > that extends applications into web and mobile media. Attend the live webcast > and join the prime developer group breaking into this new coding territory! > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users |