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Trying to create a touch pad

autodeskguest

I am creating a library part for a touch pad for a Qprox sensor that uses X

and Y grid.  I only want traces on the top of the board, so that only the

pads(sensors) are visible on the bottom which is where the PCB will connect

to a graphic overlay.

 

 

The best trick I can think of is to use one regular pad shown in the center,

and a semi circle on the bottom layer shown on the outside. I used a smaller

pad to make a connection to the large semi circle, as I know3 of know way to

connect the symbol X to the senmi circle.  But, in my experience, when the

boards are made, there may not end up a connection here so that the small

pad actually touches the large semi circle.  I can't use a pad on top of a

pad.

 

Can anyone please tell me if this will actually work as drawn once it gets

to the board house?  If not, is there a simple solution to create the touch

sensor as needed?

 

Thanks for any suggestions

 

 

 

 

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  • Jon galt wrote:

     

    I am creating a library part for a touch pad for a Qprox sensor that uses X

    and Y grid.  I only want traces on the top of the board, so that only the

    pads(sensors) are visible on the bottom which is where the PCB will connect

    to a graphic overlay.

     

     

    The best trick I can think of is to use one regular pad shown in the center,

    and a semi circle on the bottom layer shown on the outside. I used a smaller

    pad to make a connection to the large semi circle, as I know3 of know way to

    connect the symbol X to the senmi circle.  But, in my experience, when the

    boards are made, there may not end up a connection here so that the small

    pad actually touches the large semi circle.  I can't use a pad on top of a

    pad.

     

    Can anyone please tell me if this will actually work as drawn once it gets

    to the board house?  If not, is there a simple solution to create the touch

    sensor as needed?

     

    Thanks for any suggestions

     

     

     

     

     

    ------------------------------------------------------------------------

     

     

    One way to find out if your idea will work is to create a simple PCB

    with your part.  Then run a CAM job to produce gerbers.  Finally use

    GCPrevue or something similar to view the gerbers.

     

    -Dave Pollum

     

Reply

  • Jon galt wrote:

     

    I am creating a library part for a touch pad for a Qprox sensor that uses X

    and Y grid.  I only want traces on the top of the board, so that only the

    pads(sensors) are visible on the bottom which is where the PCB will connect

    to a graphic overlay.

     

     

    The best trick I can think of is to use one regular pad shown in the center,

    and a semi circle on the bottom layer shown on the outside. I used a smaller

    pad to make a connection to the large semi circle, as I know3 of know way to

    connect the symbol X to the senmi circle.  But, in my experience, when the

    boards are made, there may not end up a connection here so that the small

    pad actually touches the large semi circle.  I can't use a pad on top of a

    pad.

     

    Can anyone please tell me if this will actually work as drawn once it gets

    to the board house?  If not, is there a simple solution to create the touch

    sensor as needed?

     

    Thanks for any suggestions

     

     

     

     

     

    ------------------------------------------------------------------------

     

     

    One way to find out if your idea will work is to create a simple PCB

    with your part.  Then run a CAM job to produce gerbers.  Finally use

    GCPrevue or something similar to view the gerbers.

     

    -Dave Pollum

     

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