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  1. #1
    Hi Guys,

    I'm trying to make a very simple circuit board for my PI tank the first thing I want to add to it is the GPIO interface which is just this..
    Click image for larger version. 

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    So I download Eagle CAD watched some tutorials and came up with this replication

    Click image for larger version. 

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    But as you can see when I go to circuit layout it doesn't attached or route the parts the same as the one above .. anyone know why please ?

    Click image for larger version. 

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    Am I just being dumb and this is the correct routing ?

    Click image for larger version. 

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    Because it doesn't look like that on Ian's ?

    Click image for larger version. 

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    I want to add all the small circuits on the diagram into one board so I can house it in a box.

    Click image for larger version. 

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    Last edited by Fivetide; 03-05-2013 at 07:29 PM.

    Fiction is far more plausible when wrapped around a thread of truth

    Nothing great was ever achieved without enthusiasm.
    Ralph Waldo Emerson

  2. #2
    fivetide,
    Unless I am missing something,and probably am,
    this one shows the "air routed lines" and you can still move the various "parts" such as pads to different physical locations on the board by click and dragging where you want. Then hit the "ratsnest" icon and it will reroute the air lines in case you have a mess. Then you can to the final routing either by auto route or manual routing to get the "blue traces" that are the actual traces you want on the board.

    Hope this helps.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Art

    AKA Country Bubba
    (Older than Dirt)

  3. #3
    Hi Bubba, it was more the fact that R1 is routed to the center pin on the NPN , because that don't follow what I thought I had sketched .. or is the right pin the center pin when you go to the PCB layout ?

    Fiction is far more plausible when wrapped around a thread of truth

    Nothing great was ever achieved without enthusiasm.
    Ralph Waldo Emerson

  4. #4
    fivetide,
    I "think" your confusing the schematic symbol and the physical symbol. From the data sheet that I pulled, you can see the "base" is pin 3 and from what I am understanding your concern, you think the base should be pin 2? I believe you have things shown correctly per the schematic that you put up. And here is the full cutsheet http://www.kitsandparts.com/BD139-16.pdf
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Art

    AKA Country Bubba
    (Older than Dirt)

  5. #5
    Hi Bubba thanks for your reply's .. the part I'm using is RS-Part is it still the same layout ? Only the picture of the board Ian did looks like it follows the same tracks in real life ? if your right then what looks like the center pin is the right pin ?

    Fiction is far more plausible when wrapped around a thread of truth

    Nothing great was ever achieved without enthusiasm.
    Ralph Waldo Emerson

  6. #6
    fivetide,
    I looked at your schematic to find the part number BD139 and then did a google on that number. This is an industry standard part number. HOWEVER, I just looked up the part number you referenced above and it is a 2N3904.
    Now looking at its pinout, and I can see the confusion!. It indeed does have the base in the center pin! You need to change the part no in your schematic to the correct one for the transistor that you have.
    Here is the url to the cut sheet that I have ref'd:
    http://www.fairchildsemi.com/ds/2N/2N3904.pdf

    HTH
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Art

    AKA Country Bubba
    (Older than Dirt)

  7. #7
    Thanks Bubba , thought i was going insane lol :)

    Fiction is far more plausible when wrapped around a thread of truth

    Nothing great was ever achieved without enthusiasm.
    Ralph Waldo Emerson

  8. #8
    fivetide,
    Anytime my friend as I have been there done that and have the tee shirt to prove it!

    NEVER take anything for granted and then double check as you will usually be wrong.

    Don't ask:})
    Art

    AKA Country Bubba
    (Older than Dirt)

  9. The Following User Says Thank You to C_Bubba For This Useful Post:


  10. #9
    Quote Originally Posted by C_Bubba View Post
    fivetide,
    Anytime my friend as I have been there done that and have the tee shirt to prove it!

    NEVER take anything for granted and then double check as you will usually be wrong.

    Don't ask:})
    Thanks Bubba, lol I love your name ! in fact I ended up watching one of my all-time favourite moves late last night, Forest Gump, because of the BubbaGump Shrimp thing !

    Anyway onwards and upwards .. Iím now (because Iím a noob to electronics) struggling with finding the Recom R-788 0-1.0 and R-&8b5 0-1.5 or something similar to put on the board .. any ideas what I can use from the eagle cad libraries ? thereís only really those two parts all the rest is wiring to them.

    Fiction is far more plausible when wrapped around a thread of truth

    Nothing great was ever achieved without enthusiasm.
    Ralph Waldo Emerson

  11. #10
    I am not familiar with either one of those devices so can't really help you. I did find a while back on youtube a tutorial on how to build up your own devices for eagle. So far, my success at doing this is limited (I am new to Eagle). There is also a yahoo group that deals with Eagle and you might check into that and see if anybody has done what you need.
    As for the moniker, many years ago several of us that worked together had a project manager who called everybody bubba. Well, I lived in the country and another lived in the city so that is how we got distinguished when he called for bubba! LOL
    Art

    AKA Country Bubba
    (Older than Dirt)

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