Rules for PCB Design
These basic PCB design guidelines are recommended to keep in mind to reduce the cost of your printed circuit boards and minimize the risk of errors arising during PCB fabrication.
Create your board frame on a 0.05” grid. Make the lower left corner start at 0,0.
Usually the board frame is rectangular. For specific reasons you could also do other shape types.
Stick parts on a 0.05” grid. You should not break this rule unless you have a very good reason.
Any LED should be labeled with its purpose (power, status, etc).
When applicable, it is better to avoid having vias go through the silkscreen when adding labels.
Minimum drill size should be 15 mil. Minimum annular ring size should be 7 mil.
7 mil is the minimum size for traces. 8mil is acceptable. When possible try to keep the traces size to 10mil.
Use thicker traces for power lines. 12mil=100mA max, 16mil=500mA max etc.
7mil between traces and space is reasonable.
Avoid 90 degree corners. Straight lines with 45 degree corners are preferable.
Add color notes to separate a complex design into various smaller bits (eg. charge circuit, accelerometer, etc).
All footprints need silkscreen indicators showing mechanical sizes, dimensions, or anything wired about the part.
To prevent it from flaking off easily silkscreen within a footprint or board should not go over pads or metal that will be exposed.
When adding a footprint make sure you add a solder mask.