AVR-Chat

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.
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