@@ -299,7 +299,7 @@ Common practice for placing your components:
- Overall layout: Where you want your connectors, buttons etc. dictates the layout. For now, the USB and PWM3389 is important, later buttons/wheels, additional LEDs etc. need to be carefully considered. Check, e.g., how mice sensors are typically placed relative to the center/hand placement.
- Components are typically designed with layout in mind, consider the orientation/placement to reduce routing complexity. (E.g., inputs are grouped on one edge, outputs on another. Analog pins are grouped allowing to split ground planes etc.)
- Components are typically designed with layout in mind, consider the orientation/placement to reduce routing complexity. (E.g., inputs are grouped on one edge, outputs on another, analog pins on a third etc., to facilitate the routing and improve signal integrity.)
- Most datasheets will give an example layout for decoupling and interconnects, these are helpful to give an initial idea.
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@@ -332,11 +332,13 @@ Placement and routing is an iterative process, you will likely need to try diffe
## 5) Cut-out for the PMW3389DM
The sensor requires a cut-out, look in the data-sheet for exact dimensions. You can use the edge cut layer to make the cut out. Alternatively, you can make the edge cut a part of the footprint (but I have never done that, so not sure how hard it is, [see](https://forum.kicad.info/t/create-a-custom-shape-hole/12646)). Activate to `Show filled areas in zones`, to see verify that you don't pour copper under the the sensor.
The sensor requires a cut-out, look in the data-sheet for exact dimensions. You can use the edge cut layer to make the cut out. Alternatively, you can make the edge cut a part of the footprint (but I have never done that, so not sure how hard it is, [see](https://forum.kicad.info/t/create-a-custom-shape-hole/12646)). A third alternative is to att the cut-out as a user layer in the footprint, just a guideline as to where to cut the PCB (in that case its just informative and does not have any meaning to KiCad.)
Activate to `Show filled areas in zones`, to see verify that you don't pour copper under the the sensor.
## 6) Design Rule Check (DRC)
The Design Rule Check give you warnings if you don’t comply with the Design rules that you previously setup. It will give you warnings on short circuits, clearance issues etc..
The Design Rule Check gives you warnings if you don’t comply with the Design rules that you previously setup. It will give you warnings on short circuits, clearance issues etc..
- 1 Click on Tools/DRC, see that the options comply to the manufacturers specification.
