AVR-Chat

Thanks for your response.  I will check into the dropping the from the STK 
but the pblm is not on the rails.  I am getting 4.9v as expected from the 5v 
rail.  Problem is when I take a pin high on the 8515 it is sending more than 
the 5v.  It is sending around 5.80v.


----- Original Message ----- 
From: "Kathy Quinlan" <kat-yahoo@kaqelectronics.dyndns.org>
To: <AVR-Chat@yahoogroups.com>
Sent: Thursday, March 09, 2006 9:48 PM
Subject: Re: [AVR-Chat] RF communications


> Bryan Martin wrote:
>
>> I am working with linx txd-433-kh RF module for remote communications.  I 
>> am
>> using Atmel atmega8515 microcontroller w/a SDK500 board.  The problem I 
>> am
>> having is that the when I take the data pins high on the tx module it is
>> being passed a voltage of around 5.80v.  The tx module wants the voltage
>> below 5 to function so I attempted to place a 180ohm resistor in series
>> which didnt do anything to the voltage but if I parallel the resistor 
>> with
>> ground I get acceptable voltage and the module works.  Thing is for 1 
>> that
>> means I will have to run resistors on all the TX data pins coming from 
>> the
>> microcontroller.  This also creates heat on the resistors ( I guess this 
>> is
>> acceptable ) and causes power loss which may be a factor running from
>> batteries.
>>
>> Is their another better way around this?  BTW dropping the voltage to the
>> microcontroller from the battery is not currently an option.
>
> Use a better regulator. 5.8V is a bit to much for a 5V rail, if you are
> talking of the rail voltage on the STK500, then drop the voltage back to 
> 5.0V
> (advanced tab in STK500 programming section, board voltage :)
>
>
>
> -- 
> 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
> ---------------------------------------------------------------
>
>
> -- 
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.1.375 / Virus Database: 268.2.1/278 - Release Date: 9/03/2006
>
>
>
> Yahoo! Groups Links
>
>
>
>
>