We really like what Olimex have done here with the AVR-T32U4 (non-catchy name aside) - you get an ATMEGA32U4-based microcontroller, with comms built-in (no need for an external FTDI chip), in a format that plugs straight into your standard breadboard including power fed to your breadboard's bus lanes! The board uses a robust Mini-USB connector (grab a compatible cable here) and includes LEDs, a reset button and a programmable button too (pin 33/D7), which are both out of the way to the side. A comprehensive user manual is on hand to guide you with the board and get you started. Features * ATMEGA32U4 microcontroller * All-in-one USB communication, no need for an external FTDI chip * Breadboard-friendly format * Input power supply is taken from mini-USB * Feeds power to the breadboard bus lanes * Works on 3.3V * The LEDs and the buttons are on the edge of the board for easy access * UEXT connector * Industrial grade -45+85C Resources Documents * User's manual * OLIMEX board support package Arduino IDE installation * European Declaration of Conformity Hardware * Schematic * AVR-T32U4 REV.C Eagle schematic released under Creative Commons Attribution-Share Alike 3.0 United States License * AVR-T32U4 REV.C Eagle board file released under Creative Commons Attribution-Share Alike 3.0 United States License Software * Blink, keyboard and mouse examples using Arduino IDE 1.0 * Latest firmware needed for older devices to work with Arduino IDE 1.01 check the user manual on how to update * Simple double LED blink for Arduino IDE 1.0.1 * Button definition and example for Arduino IDE 1.0.3 Package Contents * 1x AVR-T32U4 Microcontroller USB cable not included https://elecena.pl/product/23864430/olimex-avr-t32u4-breadboard-friendly-atmega32u4-microcontroller 2023-07-20 https://elecena.pl/product/23864430/olimex-avr-t32u4-breadboard-friendly-atmega32u4-microcontroller 2023-12-27 https://elecena.pl/product/23864430/olimex-avr-t32u4-breadboard-friendly-atmega32u4-microcontroller 2024-09-18 https://elecena.pl/product/23864430/olimex-avr-t32u4-breadboard-friendly-atmega32u4-microcontroller 2024-11-29 https://elecena.pl/product/23864430/olimex-avr-t32u4-breadboard-friendly-atmega32u4-microcontroller 2024-11-30 https://elecena.pl/product/23864430/olimex-avr-t32u4-breadboard-friendly-atmega32u4-microcontroller 2025-11-28 https://elecena.pl/product/23864430/olimex-avr-t32u4-breadboard-friendly-atmega32u4-microcontroller 2025-11-29 https://elecena.pl/product/23864430/olimex-avr-t32u4-breadboard-friendly-atmega32u4-microcontroller 2026-01-08