AVR-Chat

That was it.  When I sourced VCC and ground off the SDK500 the voltage went 
to 4.95 w/no resistors.  Question though while were are talking about this. 
Lets say I wanted to run two different power supplies one for part of the 
controller portion and another for the RF portion (picture 2 different 
battery banks - trying to isolate noise getting into the RF side) is this 
possible?  Would this work if I connected the ground planes together?


----- Original Message ----- 
From: "Bryan Martin" <registration@myplaceinspace.com>
To: <AVR-Chat@yahoogroups.com>
Sent: Friday, March 10, 2006 10:01 AM
Subject: Re: [AVR-Chat] RF communications


> That may be it.  I am sourcing the VCC and ground from the NX1000 board 
> and
> not the SDK500 that holds the MCU.  I plan to check this tonight.  Thanks
> for the heads up.
>
>
> ----- Original Message ----- 
> From: "Kathy Quinlan" <kat-yahoo@kaqelectronics.dyndns.org>
> To: <AVR-Chat@yahoogroups.com>
> Sent: Friday, March 10, 2006 9:56 AM
> Subject: Re: [AVR-Chat] RF communications
>
>
>> Bryan Martin wrote:
>>
>>> Well thats a yes and no.  I currently have a 12v wall wart going into a
>>> NX1000 dev board.  From there I take 12v off the nx1000 and go to the
>>> stk500
>>> dev board.  I also take 5V off the nx1000 and go to the VCC and ground
>>> plane
>>> of the breadboard that holds the RF modules.  I think I will try to 
>>> clean
>>> this up first in hopes that is the pblm.  I will try to drop the NX1000
>>> dev
>>> board all the way out of the picture first and hook the wall wart direct
>>> to
>>> the SDK500 even though that will still be pushing 5.8v when taking the
>>> pins
>>> high.  That would be controlled by the STK500 I think.
>>>
>>> Bryan
>>>
>>
>> FIRST off, do you have a good connection STRAIGHT from the STK500 0V to
>> the RF
>> modules 0V as if you do not, or it is routed through other boards, this
>> could
>> induce the voltage rise you are seeing and cause a lot of problems (DC is
>> only
>> one, the AC ie noise etc. IS A LOT MORE)
>>
>> If you do not have a good 0V connection between the two, try it, it will
>> probably solve a few problems.
>>
>> -- 
>> Regards,
>>
>> Kat.
>> ---------------------------------------------------------------
>>  K.A.Q. Electronics     Website: www.kaqelectronics.dyndns.org
>>  IM: Yahoo: PinkyDwaggy MSN: katinka@kaqelectronics.dyndns.org
>>  For Everything Electronics    Phone: 0419 923 731
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>>
>>
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