SERIAL TTL / CMOS

SPARKFUN ELECTRONICS

Cytron

USB to UART Converter UC00C

DFRobot

DFR0065 TEL0010

Pololu

SeeedStudio

103990049 USB To Uart 5V/3.3V Serial Adapter

Sparkfun Electronics

DEV-14050 DEV-15009 DEV-15096 DEV-17725 KIT-18289 KIT-18290 KIT-18291 SparkFun USB-to-Serial Bridge - µUSB-PA5-II

Tibbo

IO Ninja Serial Tap Sniffer for RS232, RS485, and TTL-level UART Serial Tap

Waveshare

11315 11325 20265 CP2102Micro USB to UART Adapter Board PL2303 USB to UART Converter Board

Whadda

freetronics

USB Serial Adapter USBSERIAL