Replies to This Discussion

Permalink Reply by Muthanna A. Attyah on April 28, 2012 at 8:44am

Hi Chris, I’m not sure if the issue of “no signal on UART0/2” is a common one, but I recommend changing the following two photos in WIKI to advise users to use UART0 instead of UART0/2.

 

3D RoboticsPermalink Reply by Chris Anderson on April 28, 2012 at 8:48am

Vernon, do you mean the micro-traces on this pad? The boards should be shipped with the microtraces present to enable Xbee/3DR radio use on port 0, multiplexed with the USB. No user soldering should be necessary. 

Are you saying that your board didn't have the microtraces in place? They're very small, so look closely. I've drawn them from memory here; hope I remembered right! (I'm on the road and don't have hardware in front of me)

You can see all the default microtraces in this picture:

Permalink Reply by Ahmed Hassan on August 12, 2012 at 4:21pm

THANK YOU VERY MUCH; u saved me from another desperate night trying to figure out the problem !! I wonder why they made the telemetry port in the first place !!

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3D RoboticsPermalink Reply by Chris Anderson on August 12, 2012 at 5:15pm

Did you get your board from 3DR? 

Permalink Reply by Ahmed Hassan on August 12, 2012 at 7:07pm

Nope, I used an UNO shield at the PC end and this at the APM2.0 end: http://store.fut-electronics.com/Zig-11SHD006.html 

Permalink Reply by Muthanna A. Attyah on April 28, 2012 at 9:01am

Chris,

APM2.0 photo you just posted has Ver 2.4.1 on it, mine is Ver 2.4 (I bought it from 3DR almost one month ago); is there any difference related to our issue ??

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3D RoboticsPermalink Reply by Chris Anderson on April 28, 2012 at 9:18am

Not that I know of. Did yours have those microtraces already in place from the factory?

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Permalink Reply by Muthanna A. Attyah on April 28, 2012 at 9:26am

Yes, traces were there before I solder it.

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3D RoboticsPermalink Reply by Chris Anderson on April 28, 2012 at 9:30am

And you weren't getting any output from that port, even when the USB was not connected?

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Permalink Reply by Muthanna A. Attyah on April 28, 2012 at 9:43am

No signal at all from UART0/2, I tried using both FTDI cable with serial testing sketch then XBEE with X-CTU. I was getting signal from UART0 and UART2 but never from UART0/2 then I soldered over the traces just to be sure and the issue still the same.

However GND and +5V are ok on UART0/2

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3D RoboticsPermalink Reply by Chris Anderson on April 28, 2012 at 9:03am

Muthanna,

I'm not sure I'm following. Where is the UART0 that you're referring to? The images in the wiki refer to the standard setup, which is what I use.

Maybe some boards shipped from the factory with a missing/broken microtrace for the UART selection? If so, we'll correct that. But I'm not understanding why the manual recommendations should change, since that's what thousands of people already use.

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Permalink Reply by Muthanna A. Attyah on April 28, 2012 at 9:16am

Chris,

UART0 is as shown, no need to change the wiki if the issue is not common.

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