Arduino Nano - Atmel MEGA328P

Pinout

• 5V - comes form USB-C VBUS and/or output of the regulator (VIN); MCU has operating voltage of 1.8 - 5.5V
  
• VIN - goes to the regulator and can be maximum 15 V; minimum 5 + ~1.1 (dropout) for regulator to regulate
• 3V3 - output from USB-UART 

Atmel MEGA328P

Datasheet: ATmega48A-PA-88A-PA-168A-PA-328-P-DS-DS40002061B.pdf

LM1117C 50 - 5V regulator

Datasheet: lm1117.pdf

CH340C - USB-UART

Datasheet: CH340DS1.PDF

Tooling

Install IDE (and avrdude):

xi arduino

The MCU shows up on /dev/ttyUSB0 and can be programmed with CTRL-R (Compile/Verify) and CTRL-U (Upload).