Arduino Nano Circuit Design
Worked for 2 mins 2 sec
Main ICs and connectors are in. I’m adding the support network now: decoupling, reset, clocks, USB protection/config, and header breakout wiring.
Worked for 9 mins 6 sec
I designed the schematic for an Arduino Nano-style ATmega328P USB-serial breakout and renamed the project to ATmega328P USB-Serial Breakout. The design includes ATmega328P, Micro-USB, CH340-family USB-UART, reset button, 16 MHz crystal, decoupling, AREF bypass, DTR auto-reset, and a 2x15 breakout header; I also fixed the USB VBUS split so it now feeds the 5V rail.
Open items:
- I could not use exact CH340G because no exact library part was available; I used CH340K as the closest CH340-family substitute.
- Documentation/bring-up files were not created yet.
- Final ERC re-check after the last 5V fix was not completed because the account has no available ACUs.
Suggested next steps once ACUs are available:
- Re-run ERC/design checks and resolve any remaining warnings.
- Create the firmware starter and board bring-up plan files.
- Proceed to PCB placement for the Nano-style header layout.
- Route USB D+/D− carefully as a short paired route.
Use exact CH340G
Nano board outline
Add ICSP header
Bring-up checklist
