The Feather 328P brings the classic ATmega328P into the Feather ecosystem, running at 3.3V and 8 MHz. If you want to keep your existing Arduino code compatibility while taking advantage of the Feather form factor and its wide range of FeatherWing add-ons, this board is an excellent choice.

With built-in USB-to-serial via the CP2104, LiPo battery charging, and a small prototyping area for quick sensor or button connections, the Feather 328P is ready for portable projects straight out of the box.

Key Features

• ATmega328P @ 8 MHz – 3.3V logic, 32KB flash, 2KB RAM
• CP2104 USB-Serial – Built-in USB bootloader for programming and serial debugging
• 21 GPIO Pins – 19 digital I/O plus 2 analogue-input-only pins
• 8× Analogue Inputs – Two shared with I2C
• 6× PWM Outputs – For motor control, LEDs, and more
• Hardware I2C & SPI – UART devices should use SoftwareSerial
• Built-in LiPo Charger – 100 mA charging with status indicator LED
• Battery Monitoring – Battery voltage routed through a divider to an analogue pin
• 3.3V Regulator – 500 mA peak current output
• Prototyping Area – Small solderable area for quick component additions
• Pin #13 LED – Red LED for general-purpose blinking
• RX & TX LEDs – Visual indicators for serial data activity

Specifications

• Dimensions – 51 × 23 × 8 mm (without headers)
• Weight – 4.8 g
• Logic Level – 3.3V
• Mounting – 4 mounting holes

Ideal For

• Portable Arduino projects with battery power
• Classic ATmega328P code compatibility in the Feather form factor
• Expanding with FeatherWing add-on boards

Package Contents

• 1× Assembled and tested Feather 328P
• 1× Header set