AVR-Chat

I,ve used the CP2102 it comes complete on board with output level at 5V which can be connected directly to the controller,

http://www.sparkfun.com/commerce/product_info.php?products_id=198

Hope this helps,

Moataz Hussein

  ----- Original Message ----- 
  From: Marc R.J. Brevoort 
  To: AVR-Chat@yahoogroups.com 
  Sent: Wednesday, February 24, 2010 4:51 PM
  Subject: Re: [AVR-Chat] USB to serial db9 cable


    
  On Tue, 23 Feb 2010, rsimonus wrote:

  > I am curious about USB to serial db9 cable.
  > I am planning to buy one. I want to know if
  > any USB to serial 9pin cable which will work
  > with any device and my old Sony Clie or it is
  > depend on brand and model? I see walmart sell
  > those for $9 dollars.

  I recently got one labeled HL-340 which works
  fine-it didn't need any drivers, just setting
  another COM port from minicom.

  Testing it was a bit difficult though.

  If you want to use a DB9-to-USB cable
  to communicate with a microcontroller, you
  need to keep in mind that the data being
  sent by the USART is

  - inverted comparted to RS232 traffic

  - uses TTL levels (0-5 volts) rather
  than RS232 levels (-12..-3, 12..3 volts)

  You *can* try to overcome these two problems
  by feeding the signals through a NOT gate
  and then stepping up the voltage with a
  charge pump. This is highly educational and
  if you are in it for the experience, I can
  highly recommend it.

  ... but if you simply want to communicate
  from AVR to PC and get it done fast, it's
  much easier to just order a little MAX232
  converter board as well, hook up the USART
  pins to that and be done with it.

  I got something like this:

  http://cgi.ebay.co.uk/MAX232-RS232-Serial-to-TTL-UART-Converter-Board-Adapter_W0QQitemZ120534212314QQcmdZViewItemQQptZUK_Computing_CablesConnectors_RL?hash=item1c10661eda

  Depending on your needs you might even simply use a
  TTL-to-USB rs232 interface board and skip the
  DB9 connector altogether:

  http://cgi.ebay.co.uk/USB-to-RS232-Module-Based-TTL-Converter_W0QQitemZ260550110677QQcmdZViewItemQQptZUK_Computing_CablesConnectors_RL?hash=item3ca9ff2dd5

  Hope this helps.

  Best,
  Marc


  

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