{"title":"Adafruit WCH CH9102F Friend - USB to Serial Converter","handle":"adafruit-wch-ch9102f-friend-usb-to-serial-converter","url":"/products/adafruit-wch-ch9102f-friend-usb-to-serial-converter","description":"The Adafruit CH9102F Friend is a USB-to-Serial converter breakout featuring the affordable WCH CH9102F chip and a modern USB Type-C connector. It uploads code at up to 3 Mbit/s and includes auto-reset for Arduino/ATmega328 boards — no manual pin manipulation needed.\n\nThe pinout matches standard FTDI cables by default: RTS on pin 6, +5V power, and 3.3V signal levels (5V compliant). It works with any Arduino, ESP8266, ESP32, or other microcontroller that uses an FTDI-style serial port for communication and code upload. All modem control pins (DTR, RI, DSR, etc.) are broken out on the side for advanced use.\n\nKey Features\n\n\nCH9102F USB-Serial Chip – Affordable, widely available, with good driver support\n\nUSB Type-C Connector – Works with any modern computer\n\nUp to 3 Mbit/s – Fast upload speeds for quick development\n\nAuto-Reset – Automatic reset for Arduino/ATmega328 boards via RTS/DTR\n\nFTDI-Compatible Pinout – Drop-in replacement for FTDI cables\n\n3.3V Signal Levels – 5V compliant for compatibility with most 3.3V and 5V systems\n\nFull Modem Control Pins – DTR, RTS, RI, DSR, DCD, and CTS broken out\n\nRX/TX LEDs – Visual indication of data activity\n\n\nIdeal For\n\nProgramming Arduino, ESP8266, ESP32, and other FTDI-port microcontrollers\nUSB-to-serial debugging and communication\nReplacing FTDI, FT231x, or CP210x adapters\nSerial console access to embedded systems\n\n\nPackage Contents\n\n1× Adafruit CH9102F Friend (fully assembled and tested)\n1× Right-angle socket header (for FTDI-style edge connection)\n1× Male header strip (for breadboard use)\n\n\n\nNote: On Linux, the CTS pin is not supported by the built-in kernel driver (all other flow control pins work fine). An out-of-tree driver is available to fix this. For uploading code, most microcontrollers use RTS/DTR so this is rarely an issue.\n\n\nResources\n\n\nWCH USB-Serial Driver Installation Guide – Windows and macOS driver setup\n","vendor":"Adafruit","product_type":"physical","in_stock":false,"options":[],"variants":[{"id":1899,"title":"Default Title","sku":"AF-5568","price":10.22,"on_sale":false,"in_stock":false,"available_quantity":0,"option1":"Default Title"}]}