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Don't Connect/Route Power Pin

Former Member

Hi everyone!

I'm making an Arduino Due Shield, and at the Main Board there are Output Power Pins (+5V, +3V3), which I use in my Shield.

The problem is that those pins are being connect one to each other (Output to Output) and not only to what is being used in my Shield (as Input).

Those Output Power Pins are in a simple Header.

Is there someway to tell the program to don't connect them?

 

Thanks!

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  • 0

    Hi Giovanni,

    The 3V3 and the 5 volt power taps on the header of the Arduino should not be connected to one another. The power to these pins is not software controllable either. If they are connected, there may be a solder bridge somewhere you don't want it. I might ask, what makes you think that they are connected and where do you think this connection is being made? Here is the schematic for the Due:

     

    https://www.arduino.cc/en/uploads/Main/arduino-Due-schematic.pdf

     

    The 3V3 is provided by using some power from the 5 volt source and regulating it with the IC 4 NCP1117ST.

     

    John

  • 0 in reply to jw0752

      wrote:

     

    Hi Giovanni,

    The 3V3 and the 5 volt power taps on the header of the Arduino should not be connected to one another.

    <snip>

    John

    Just for the clarification, because this thread is full of misunderstandings or wrong interpretations of what someone said:

     

    When original poster said: 'The problem is that those pins are being connect one to each other', he didn't want to say that 5V and 3V3 pins are connected together - he wanted to say that multiple 5V pins are connected together (by airwires) and multiple 3V3 pins are connected together forcing him to route the traces which he does not need or want to route.

     

    I have here described the solution. What original poster asked is legitimate demand and it seems the option of doing exactly what was asked was finally added as a new option in Eagle 7. No doubt Eagle developers added that option after realizing it was missing.

  • 0 in reply to chupo_cro

    Thank you for your clarification of what the original poster said 2 years ago. I had forgotten my response. I usually avoid replying on the CadSoft questions as they are usually more about CadSoft's protocols and not so much about the actual electronics. Here on the E14 site we see the CadSoft forum as but one of many streams. Based on the phrasing of the original question I stand by my answer but I can also see where I could have misunderstood the poster.

     

    John

  • 0 in reply to jw0752

      wrote:

     

    Thank you for your clarification of what the original poster said 2 years ago. I had forgotten my response. I usually avoid replying on the CadSoft questions as they are usually more about CadSoft's protocols and not so much about the actual electronics. Here on the E14 site we see the CadSoft forum as but one of many streams. Based on the phrasing of the original question I stand by my answer but I can also see where I could have misunderstood the poster.

     

    John

    You are welcome. I think these old threads are a valuable source of informations for someone who will search for the solution to the same problem in the future. This thread might save someone hours of time. Especially because this thread is the very first result when searching google with the string:

     

    cadsoft eagle how to route not connected pins

     

    In fact I registered just to answer this question. Otherwise I use news client for accessing news.cadsoft.de server to read the topics but this thread did't show among the posts and I am not able to find it using any combination of the links starting from www.element14.com

     

    Regards

Reply
  • 0 in reply to jw0752

      wrote:

     

    Thank you for your clarification of what the original poster said 2 years ago. I had forgotten my response. I usually avoid replying on the CadSoft questions as they are usually more about CadSoft's protocols and not so much about the actual electronics. Here on the E14 site we see the CadSoft forum as but one of many streams. Based on the phrasing of the original question I stand by my answer but I can also see where I could have misunderstood the poster.

     

    John

    You are welcome. I think these old threads are a valuable source of informations for someone who will search for the solution to the same problem in the future. This thread might save someone hours of time. Especially because this thread is the very first result when searching google with the string:

     

    cadsoft eagle how to route not connected pins

     

    In fact I registered just to answer this question. Otherwise I use news client for accessing news.cadsoft.de server to read the topics but this thread did't show among the posts and I am not able to find it using any combination of the links starting from www.element14.com

     

    Regards

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