Hi everyone, I'll start off by saying this is my first PCB design ever, and that I am not an Electrical Engineer (or a student in the field). Chances are there is a lot wrong with the design. With that out of the way, here it is:(NOTE: this is an edited version, older comments will be referencing the old version)DONT BOTHER TO READ THIS! I HAVE MADE EDITS YOU CAN FIND DOWN BELOW!
I also made a version where everything is connected and the MPU is the actual ATtiny85-20PU that I will be using, instead of the 8 pin dip socket:
here is also the top of my pb design (note that the part numbers will correspond to the first schematic):
and the bottom:
The goal of the BCP is for the ATtiny85-20PU to read data from the BMI323 accelerometer and depending on that change the PWM signal being sent.It is a 2 layer PCB.Power will be coming in through the top 3 pin connector, which also carries a PWM signal that is directly routed to the middle 3 pin connection.5V and GND will be delivered through that same top 3 pin connector, with both directly connected to both other 3 pin connectors.I am aware that the ATtiny needs to have a bootloader burnt, I will do this using an arduino that I have lying around. I will also use this arduino to program the chip. (this way I won't need a usb connection or something on the board)
Will this PCB do what I want it to do and/or are there any errors or tips?As I said I am very new to this, so it wouldn't surprise me if there are many things wrong with this design, or I havent adhered to design conventions I am not aware of.Thanks for the help in advance!
EDIT: I have added the 100 nF decoupling capacitors in front of the ATtiny and BMI323EDIT 2: I have now also switched to a different voltage regulator and added capacitors to its input and outputEDIT 3: Switched to another more different voltage regulator and changed out the capacitors to SMD MLCCs, which made the whole PCB a lot smaller.EDIT 4: Added feathering to all terminal traces, thickened all traces, replaced the 8 pin dip socket with the ATtiny85-20PU and added 6 debug terminals that directly connect to the 6 data pins of the ATtiny.
Here is also the updated PCB layout top:NOTE: I have rotated the whole circuit board so the IO is now on the bottom.
And bottom:
