Arduino - USB/Serial Converter for Arduino Mini #A000014
Amazon.com: WITMOTION USB-UART 6-in-1 USB to Serial Converter, Multifunctional (USB to TTL/RS485/232, TTL-RS232/485, 232 to 485), Universal Adapter Module with CP2102 Compatible with Windows 7/8/10,Linux, Arduino : Electronics
Ways to Use Arduino as USB to TTL Converter - Hackster.io
3 Ways to Use Arduino as USB Serial Adapter Converter - Oscar Liang
Ways to Use Arduino as USB to TTL Converter - Hackster.io
Using the Leonardo as USB to serial converter. | PeterVH
Program Arduino via USB to Serial RS232 Converter with and without DTR Pin - Arduino Projects and Robotics Tutorial
chipKIT - ArduinoPro
Geekcreit® FT232RL FTDI USB To TTL Serial Converter Adapter Module Geekcreit for Arduino - products that work with official Arduino boards Sale - Banggood USA-arrival notice
Amazon.com: 10Gtek# 3.3V 5.5V FT232RL Mini USB to TTL Serial Converter Adapter Module for Arduino : Electronics
Arduino as a usb to serial(TTL) converter - YouTube
USB 2 Serial Converter to program an ATMEGA328P - Microcontrollers - Arduino Forum
Programming with USB-Serial Converters - Tutorial Australia
Arduino programming by USB to TTL converter - YouTube
How to Use Arduino as USB to Serial Converter | Microcontroller Tutorials