Fermion: FT232RL USB to TTL Serial Converter (Breakout, 3.3V/5V)

The Fermion FT232RL USB to TTL Serial Converter is a compact breakout board designed for reliable serial communication between computers and microcontrollers. Featuring selectable 3.3V or 5V logic and automatic DTR reset, it is an essential programming and debugging tool for students, hobbyists, and embedded developers.

DTR pin for automatic reset

The module exposes the DTR pin to support automatic hardware resets during sketch uploads on compatible Arduino and LilyPad hardware. This removes the need for manual button presses when uploading new firmware or debugging code.

Jumper-selectable 3.3V and 5V output

An onboard jumper allows users to easily switch between 3.3V and 5V output levels. This broad voltage compatibility makes the converter safe and adaptable for diverse microcontroller logic levels.

Onboard TX and RX status LEDs

Integrated transmit and receive LEDs provide clear, real-time visual feedback whenever serial data is flowing. This allows quick diagnostic verification and simplified troubleshooting during prototyping.

Standard FTDI pinout and MicroUSB

Powered via a MicroUSB port, the board uses a standard 6-pin FTDI header featuring clearly marked BLK and GRN orientation pins. This alignment matches standard ground and DTR cable configurations to prevent incorrect wiring.

Broad microcontroller development support

The converter is well suited for bootloader burning, serial console monitoring, and firmware deployment across custom circuits and development boards. It delivers dependable USB-to-TTL communication for electronics, robotics, and IoT projects.

Downloads & documentation

• schematics