Rather than use the solder jumper that Arduino employed, I’ve just dropped a 0R resistor onto the schematic instead. The 1M resistor will be a simple 0805 size surface mount chip resistor, 1% tolerance, 1/8W because it’s not going to see any real current, ever. Parts.io shows a risk factor of 2.5, which is juuuust over the line, so I’ll take on that risk in exchange for using a part that I *know* works. It’s surface mount, includes the load caps, and saves money in the long run. The Ceramic Resonator is a Murata CSTCE16M0V53-R0, as specified on the official schematic, and I don’t see a reason to change that. The capacitors are all 0.1uF (100nF), so we’ll can keep using the ones that we selected way back when. Same goes for the 10K resistor and the voltage spike protection diode. Starting at the top of the ATMEGA328P schematic, the ICSP header is a simple 2×3 header, just like for the 16U2, so we can just that same part again. Now we finally get to wrap up the schematic portion of this project by publishing the ATMEGA328P schematic, the BOM and quickly going through the shield headers.īuild An Arduino UNO R3 from Scratch Table of ContentsĬompared with how the official schematic looks for this section, I think our ATMEGA328P schematic cleaned it up nicely. In part 11, the DTR and RESET system was taken apart piece by piece.
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