Standalone Arduino with ATMEGA328P / Serial working, but serial programming not (only once after buning bootloader) - Arduino Stack Exchange
UNO R3 ATMEGA328P-16AU CH340G Micro USB Development Board Compatible f – diymore
ATmega328P Standalone Board - From Ideas to Products - Hackster.io
UNO R3 Development Board ATmega328P CH340 CH340G For Arduino UNO R3 With Straight Pin Header with Cable|Integrated Circuits| - AliExpress
Amazon.com: ACEIRMC for Arduino Nano V3.0, Nano Board CH340/ATmega328P Without USB Cable, Compatible with Arduino Nano V3.0 ( Without Cable) (3 Pack) : Electronics
ATmega328/P 8-bit AVR Microcontrollers - english - User service manuals