Pro Mini ATmega328P 5V / 16MHz Development Board + CH340 USB to TTL Converter Programmer CH340G Module for Arduino|usb to|usb to ttlusb to ttl converter - AliExpress
Programming ATmega328p Using USB to TTL - YouTube
avr - I can't flash my new ATMega328p with PL2303 USB-TTL converter - Electrical Engineering Stack Exchange
Problem uploading to standalone ATMega328P by serial/usb - Avrdude, stk500, Bootloader issues - Arduino Forum
UNO+WiFi R3 ATmega328P+ESP8266 Board 32Mb Memory USB-TTL CH340G Compatible For Arduino Uno – Alexnld.com
Programming an ATmega328 with Arduino bootloader via a FTDI USB-serial adapter - Electrical Engineering Stack Exchange