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Touch sensor: pad and airwires

autodeskguest

Hello,

I'm designing a common touch sensor: a circular pad with a small hole at

the center to allow back-lighting from the bottom side.

 

I placed a square smd pad with roundness 100% to make it circular.

Then I placed a hole at the center.

 

I was expecting the DRC complaining about dimensions, but the weirdest

thing is there is always an airwire to the center.

Of course I connected the pad to the front-end in another point, because

the center will be cut.

 

I guess the dimensions layer surrounding the hole prevents EAGLE to

understand I've already connected that pad.

 

Is there a better way to do this or I must accept these drawbacks?

Thanks

Marco

 

Parents

  • On 02.08.2016 14:45, Marco Trapanese wrote:

    Hello,

    I'm designing a common touch sensor: a circular pad with a small hole at

    the center to allow back-lighting from the bottom side.

     

    I placed a square smd pad with roundness 100% to make it circular.

    Then I placed a hole at the center.

     

    I was expecting the DRC complaining about dimensions, but the weirdest

    thing is there is always an airwire to the center.

    Of course I connected the pad to the front-end in another point, because

    the center will be cut.

     

    I guess the dimensions layer surrounding the hole prevents EAGLE to

    understand I've already connected that pad.

     

    Is there a better way to do this or I must accept these drawbacks?

    Thanks

    Marco

     

    Instead of hole, use a pad. If the device in lib editor have both the

    pad and smd, make sure they are both merged to the same pin symbol.

     

    Your hole may efficiently prevent the copper from reaching the center of

    the smd pad.

     

     

Reply

  • On 02.08.2016 14:45, Marco Trapanese wrote:

    Hello,

    I'm designing a common touch sensor: a circular pad with a small hole at

    the center to allow back-lighting from the bottom side.

     

    I placed a square smd pad with roundness 100% to make it circular.

    Then I placed a hole at the center.

     

    I was expecting the DRC complaining about dimensions, but the weirdest

    thing is there is always an airwire to the center.

    Of course I connected the pad to the front-end in another point, because

    the center will be cut.

     

    I guess the dimensions layer surrounding the hole prevents EAGLE to

    understand I've already connected that pad.

     

    Is there a better way to do this or I must accept these drawbacks?

    Thanks

    Marco

     

    Instead of hole, use a pad. If the device in lib editor have both the

    pad and smd, make sure they are both merged to the same pin symbol.

     

    Your hole may efficiently prevent the copper from reaching the center of

    the smd pad.

     

     

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