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Adding ICSP header pins to an Eagle circuit

bazz

Hi guys,

 

first post.

 

Let's get right to it.

 

I'm very inexperienced with Eagle Cad, so it would help to be detailed, don't go overboard though. Hopefully we find a good match.

 

I'm looking to modify a pre-existing eagle Schematic and board combo to include a 3x2 row of pin headers connected to the microcontroller for easy hookup to do ICSP. I thought it would be great to try this out to improve and get acquainted with Eagle.

 

For this project, I am ordering a set of 2-row headers.

 

I took a look at the datasheet for my pin headers. here is a link: http://www.samtec.com/documents/webfiles/pdf/TSW_TH.PDF

 

I already extracted what I think is the most important information, but let's review so that you can approve. The two pieces of info I took are the thickness of the pin itself, and the distance between 2 pins from their centers.

 

Pin Thickness: 0.64mm

Distance between center of pins (for all adjacent pins, up/down/left/right): 2.54 mm

 

I think these are the most essential pieces to have. Please correct me if I'm wrong. Once again, this is my first time doing this.

 

Moving forward, I have some important information that I need to communicate to Eagle. I want to make, and please pardon my language here *symantics, I want to place 2 rows of 3 pin headers connected to the microcontroller as previously stated. Here's a picture of a fabricated circuit that has these pin headers in place:

 

http://wiki.ladecadence.net/lib/exe/fetch.php?media=programador-funcionando.jpg

See at the bottom left of the board.

 

Now, let's take a look at the current image of the board I am working on, in Eagle:

http://farm8.staticflickr.com/7398/9189980332_eb8a892732.jpg

As we can see, for the most part a single sided board, with the exception of a few wires on the top.

 

Now here's where I need help:

I want to learn how to route some tracks from certain pins of IC2 to a special spot for my new pin headers.

Also, with the information I extracted on my pin headers. How do I:

  a) Create the actual pin headers in software

  b) know the correct diameter to specify for those holes. Also, is there a certain formula that I can go by for the future when I have the pin thickness that I can use to always know what to use in the future for the diameter of the hole?

 

I would really appreciate a step-by-step process for the actual placement of the pin headers, and how to modify the current state of the board? I really have no idea where to get started.

 

Thanks,

Bazz

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  • 0 in reply to bazz

    Hi Michael,

     

    Michael Bazzinotti wrote:

    How do I:

     

      a) Create the actual pin headers in software

     

    The part already exists in EAGLE; see the con-lstb library, it is called MA03-2. These DIL headers are quite common parts.

     

       b) know the correct diameter to specify for those holes.

     

    If you know the pin thickness, since it is square, pythagoras' theorem is used. Or, just use the part mentioned above.

     

     I would really appreciate a step-by-step process for the actual placement of the pin headers, and how to modify the current state of the board? I really have no idea where to get started.

     

    There is a tutorial. If you follow it entirely, then it will help a lot, because it covers the entire process.

     

     I mean not only the thickness of the hole itself, but also the optimal metallic surface size to solder to. How do I calculate that? Are there standard sizes/presets I should be aware of?

     

    It depends on the board manufacturer's rules, which they publish or you can request. They will have a rule on the clearance you can have between pads. As far as I know, there is no standard. Usually, the component manufacturer will publish a recommended land pattern. For 2.54mm DIL headers, it is not critical usually, and the con-lstb library may be sufficient.