The Feather 32u4 Basic Proto is the no-frills member of the Feather 32u4 family, with a built-in prototyping area where you can solder on extra components like buttons, sensors, or connectors without needing a separate breadboard.

Built around the ATmega32u4 running at 8 MHz with 3.3V logic and native USB support, this board can act as a serial device, keyboard, mouse, or USB MIDI controller. Built-in LiPo battery charging and automatic USB/battery switching make it ideal for portable projects.

Key Features

• ATmega32u4 @ 8 MHz – 3.3V logic, 32KB flash, 2KB RAM
• Native USB – Built-in USB bootloader, serial debugging, and HID device support
• Built-in Prototyping Area – Solderable space for quick component additions
• 20 GPIO Pins – Including 10 analogue inputs (one used for battery monitoring) and 7 PWM outputs
• Hardware Serial, I2C & SPI – Full peripheral support
• Built-in LiPo Charger – 100 mA charging with status indicator LED
• Battery Monitoring – Battery voltage routed to an analogue pin via divider
• 3.3V Regulator – 500 mA peak current output
• Pin #13 Red LED – General-purpose blinking

Specifications

• Dimensions – 51 × 23 × 8 mm (without headers)
• Weight – 4.8 g
• Mounting – 4 mounting holes

Also Available

• Feather 32u4 Adalogger – With MicroSD card holder
• Feather 32u4 Bluefruit LE – With Bluetooth Low Energy
• Feather 32u4 RFM95 LoRa Radio (868/915 MHz)
• Feather 32u4 RFM96 LoRa Radio (433 MHz)
• Feather 32u4 FONA – With cellular connectivity
• Feather 328P – ATmega328P variant

Ideal For

• Quick prototyping with onboard solderable area
• Portable Arduino-compatible projects
• USB HID devices (keyboard, mouse, MIDI)

Package Contents

• 1× Assembled and tested Feather 32u4 Basic Proto
• 1× Header set