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You can draw the contour of the antenna on any mechanical layer end convert it to solid region:
1) draw the contour on mechanical1 layer for instance
2) select the contour
3) go to Tools>Convert>Create Region from Selected Primitives
4) click right button on the region and select Properties
5)...
You can use timer in compare mode see in the attached link.
1) Make interrupt by compare module with exact interval (10 - 100msec)
2) Set some global flag and turn on the backlight every time you sense some key is pressed except Mode key.
3) In the interrupt routine check the flag
if(flag)
{...
You can use some small MOSFET like si2301-sot23 or something like this to control the backlight. Arrange in your program some counter that will be erased every time when key is pressed. In case the counter reaches some value (value equals to desired delay) the backlight turns off.
Another way to...
It depends of your layout. In any case the connection should be done shortly to pins of the ADC. If you want more detailed answer, please post your layout.
1) sketch you board outlines on any mechanical layer on mechanical 1 for example
2) select only the outlines
3) select "Define from selected objects" from "Designe --> Board shape" menu
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