USB Serial Light Adapter compatible with Arduino (3.3V/5V)

The USB Serial Light Adapter is a compact USB-to-TTL communication board designed for programming and serial debugging on embedded platforms. Built around the Atmega8U2 converter, it enables direct connection between your computer and microcontrollers lacking onboard USB hardware. It is well suited for students, educators, and makers working on robotics and prototyping projects.

Atmega8U2 USB-to-serial converter

The board utilises an Atmega8U2 microcontroller configured as a dedicated USB-to-UART bridge, mirroring the interface found on the Arduino Uno. It operates using standard USB COM drivers, reducing setup complexity during firmware uploads and serial communication workflows.

Selectable 3.3V and 5V logic

An onboard jumper allows you to quickly switch between 3.3V and 5V power and logic outputs. This ensures seamless compatibility across both standard 5V and low-voltage 3.3V development boards without requiring external level shifting.

Dedicated programming pinout and LEDs

Essential connections including RX, TX, VCC, GND, and Reset are broken out for straightforward wiring to target microcontrollers. Integrated RX and TX status LEDs provide instant visual feedback during data transmission and firmware flashing.

Versatile development board support

The adapter connects directly to target boards such as the Arduino Ethernet, Mini, Pro Mini, LilyPad, LilyPad Simple, and Fio. It features a standard mini-USB connector and maintains a compact 40 x 21 mm physical footprint for embedded builds.

Included in the box

Each package includes one USB Serial Light Adapter compatible with Arduino.

Downloads & documentation

• Protel Schematic