AVR ATMEGA328P Project Board – Part 2 – PCB Roughing

Welcome to part 2 of the series. In this video, we actually reference the building out of a blank 50x50mm rounded corner board with M3 hole mounts. Since I already had a video like that posted up, I didn’t want to use up too much time to duplicate content. Folks who want to check it out can do so.

Rough Placement

So the TLDR; of this video segment is that we place parts on the board roughly where we want them to be. Ie,

  • We might want the MCU in the middle of the board so it’s easy to route to it from anywhere?
  • We want the headers for Serial, I2C, GPIO, and ADC to be on the outer edge, where it will be easier to access.
  • We want the button to be on the edge of the board away from the headers.
  • We generally want the parts close to the pins they will be connecting.
  • And we generally want to avoid cross-overs of the air wires… this will generally signify a higher potential of the use of VIA(s) or just make it harder on the auto-router or us, to complete routing.

Tools Used

Once again, the tools are pretty straight forward:

  • Autodesk Eagle PCB Design
  • A computer

In truth, it doesn’t have to be Eagle. It could be KiCad, or any of the other free EDA tools, or one of the more industrial ones like Altium.

What I’m doing in this video is establishing the rough placement of where I want the parts… sort of a first draft.

Okay, that wraps it up. In the next video, I’ll be doing the actual finer placement and move things around a bit.

Video Time Table of Contents

00:00 – Intro

00:32 – Start of montage/fast forward build of a 50x50mm board with rounded corners and M3 mounting holes. You can view a video dedicated to creating the blank board here: (https://youtu.be/AjLmpPawj-8)

00:38 – Start of Parts placement

00:40 – Set the grid sizing to be 1/4 of 2.54mm

00:50 – Place the ATmega328p

01:24 – Rough placement of the various headers

02:31 – Grouping Resistors for move and placement

03:22 – Wrap up the rough placement.

03:38 – Credits Roll

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