2 layers60 × 63 mm

ATMEGA328P AU BASE CYUSB v1.0
kgsully/MCU.ATMEGA328P-AU-Base
Base Schematic and PCB for ATMEGA328P-AU w/ USB-UART Bridge
52 parts1
Open-source boards designed in KiCad by kgsully on GitHub, from 3 repositories. A board’s address here is its repository’s there.

kgsully/MCU.ATMEGA328P-AU-Base
Base Schematic and PCB for ATMEGA328P-AU w/ USB-UART Bridge

kgsully/MCU.ATMEGA328P-AU-Bootloader-PCB
PCB to Burn the Arduino Bootloader to Bare ATMEGA328P-AU Chips

kgsully/MCU.ESP32-Base
Base Schematic and PCB for ESP32 WROOM w/ USB-UART Bridge