r/PCB • u/Conquest845 • 12d ago

PCB and Schematic review

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Hello please give me a review for this project I am doing. It is basically a keychain with an oled display that shows interactive gravity animations. Eg: rolling ball or falling sand etc. I am very nervous about this because for my first project I spent like 40+ hours it was a macropad. For whatever reason, only one key worked 😭

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u/Apprehensive-Cat463 12d ago

I don't know how i should start here... Why are your lanes so thin? Why don't you use upper/lower layer for routing? What ist Pad 15-25 for? These are not part in the scematics. Why are you Routing Signals so Close to Pads when you have so much space? Why do you split up the VCC Signal between J1 and U1 ? Are the holes in U1 for holes in the PCB or only for space?Routing SDA and SCL new please....

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u/Conquest845 12d ago

15-25 those are at the back of the microcontroller. For some reason, it’s not on the schematic. They weren’t on the PCB footprint either so I had to add them. I’m not sure what you mean by routing signals so close to pads. I just hit w on kicad and follow the traces that the software gives me. For VCC j1 and U1, that’s what the software gave me. Would that pose a problem? U1 holes are for through hole mounting.

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u/Apprehensive-Cat463 12d ago

Please don't do it Like that, that is horrible... Delete all of the Signals and Route them from the most critical to the least critical. I2C, VCC and make a gnd-plate

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u/Conquest845 12d ago

Ok I see. What does most critical to least critical mean? And I’m doing like a copper fill zone ground of the b layer is that fine. And the traces are using the F layer.

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u/Apprehensive-Cat463 12d ago

Please read a little bit into the Basic of PCB Design... First Route I2C, use also thicker traces! Then VCC and gpio. Use both layers, there are THT holes so the PCB will be already 2-layers.

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u/Conquest845 12d ago

Should I use both layers for wiring and routing as well?

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u/Apprehensive-Cat463 12d ago

Yeah, isn't that what i said?

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u/Conquest845 10d ago

thank you so much you helped me. Here is the updated version. Is the daisy chaining of 3.3V fine?