Hello everyone!
I've been designing 2 layered PCBs for years, and here I was thinking that maybe I should try a 4 layered design in a not-so-demanding project.
That not-so-demanding project turns out to be the driver/control board of a small drone with core-less DC motors.
I've attached the schematic as a .pdf file -- Iknow there is a typo in the barometer.
The first layer hosts the majority of the components, has the I2C bus, and the different supply rails for the boost, buck and LDO converters ( top.png ).
The second layer is the ground layer ( ground.png ).
The third layer is the VDD power plane for the digital circuits and the V+ for the motors ( power.png ).
The last layer has the SPI lanes, some slow I/O traces and the RGB LED which must be on the bottom to be observable when (if) the drone flies. ( bottom.png ).
For my untrained eyes, this setup is good enough, but I'm curious to find out, what could be improved on it?
Thank you in advance.