AVR-Chat

Richard,
As a long time user of Eagle (and its goofy arrogant German interface), I'd recommend that you always run the DRC (design rule check) before making your Gerbers.   It will warn if the board doesn't match the schematic; I can't tell you how many times I've caught something at the last minute.

Tim

  ----- Original Message ----- 
  From: Richard Cooke 
  To: AVR-Chat@yahoogroups.com 
  Sent: Tuesday, November 13, 2007 11:13 AM
  Subject: [AVR-Chat] Re: Debugging a ATmega48V - what's going on? - I found it!


  Hi Folks,

  First, I want to thank every one for their good suggestions in trying
  to track down this bug. Just goes to show you that two (or more)
  heads are better than one.

  John Samperi and Cat win the prize. If either one of you is ever in
  town lunch is on me. Turns out John's suggestion lead me to measure
  the Vcc and it did indeed fall to 1.3V (from 3.3V) as soon as I single
  stepped to the offending line in the debugger. I had run out of ideas
  so I revisted the RF section per Cat's suggestion. Turns out I made a
  layout error and there was a short between the radio output and the
  antenna. Looking back at the entire episode it makes perfect sense -
  the bug only appeared when the radio went into TX mode. I just wasn't
  smart enough to see it.

  Turns out that Eagle will allow you to make a connection while laying
  out the PCB even if the schematic doesn't. I've just recently
  switched to Eagle from Winboard so I'm still learning how it does
  things. Winboard wouldn't allow you to connect two components if they
  weren't connected in the schematic. Now I know so I'll be more
  careful next time.

  Thanks again for all of your help. I'd still be staring at the board
  without your help.

  Richard Cooke
  Lake Forest, CA USA 

  --- In AVR-Chat@yahoogroups.com, "Cat C" <catalin_cluj@...> wrote:
  >
  > Are those pins turning on some RF stuff that being differently
  matched might 
  > use more current?
  > Did you validate the new RF design some other way, so you really
  have no RF 
  > shorts (not just DC)?
  > 
  > If you power from the Dragon USB... anything above a certain power
  might 
  > turn it off.
  > 
  > Cat
  > 
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