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TZT FT232RL FTDI USB 3.3V 5.5V to TTL Serial Adapter Module for Arduino FT232 Pro Mini USB TO TTL 232 - AliExpress
Amazon.com: #10Gtek# USB to ESP8266 ESP-01 Serial Adapter, USB to TTL Driver Serial Compatible with Arduino, Pack of 2 : Electronics
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
Bluetooth Bee xbee adapter USB Adapter module(Blue) + usb cable for Arduino
Type-C USB3.1 Female Connector Adapter Test Board USB 3.1 24P 24Pin Socket Base PCB Board for Arduino USB 2.0 DIY - AliExpress
Electronics-Salon DIN Rail Mount Screw Terminal Block Adapter Module, for Arduino UNO R3.: Amazon.com: Industrial & Scientific
Arduino PS/2 to USB Adapter : 7 Steps (with Pictures) - Instructables