Here's one last tip before we get to laying our board out. Before you start routing, make sure the layers above (aside from tStop and bStop) are visible. To turn any layer off or on, click the 'Layer Settings.' button - and then click a layer's number to select or de-select it. This might show the outline of a part, or other useful information. These are usually drill holes for stand-offs or for special part requirements. These define where soldermask should not be applied.ДЄbsent soldermask on the bottom side of the board. Origins for parts on the bottom side of the board. Top origins, which you click to move and manipulate an individual part. Silkscreen printed on the bottom side of the board.

Silkscreen printed on the top side of the board. Rubber-band-like lines that show which pads need to be connected. Also indicates copper on both layers.ДЄirwires. These are usually covered over by soldermask. Smaller copper-filled drill holes used to route a signal from top to bottom side. Any part of the green circle is exposed copper on both top and bottom sides of the board. Here are the layers you'll be working with in the board designer: Color We use a palette of colors to represent the different layers. The EAGLE board designer has layers just like an actual PCB, and they overlap too. The layers of a double-sided PCB (image from the PCB Basics tutorial).

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