SparkFun RedBoard Plus ATmega328P Development Board USB-C

The SparkFun RedBoard Plus is an updated, Arduino-compatible development board that builds on the familiar Uno design with added functionality. Ideal for makers, educators, and hobbyists, it offers a wide range of I/O options and modern connectivity in a compact, solder-friendly format.

At its core, the board is powered by the ATmega328P microcontroller with the Optiboot (Uno) bootloader, running at a 16MHz clock speed with 32kB of flash memory. You get 22 digital I/O pins, 6x PWM outputs, and 8x analogue inputs, making it versatile for a variety of projects. The board also breaks out the SDA, SCL, and IOREF pins, and includes UART, I2C, and SPI interfaces for seamless communication with sensors and peripherals.

One of the standout features is the integrated Qwiic functionality, enabling quick and solderless connections to the Qwiic ecosystem of sensors and displays. The board also features USB-C connectivity for both power and data transfer, alongside a barrel connector that accepts 7-15V DC. Built-in voltage regulators and a 3.3V/5V logic level switch let you adapt to your project’s requirements. A resettable PTC fuse rated at 5V/2A protects the board from overcurrent, and the CH340G serial-to-USB converter ensures reliable programming and communication.

With labelled PTH holes alongside standard female headers, the RedBoard Plus is perfect for easy soldering and prototyping. It is fully compatible with R3 shields, opening up a vast range of expansion options.

Specifications

• Microcontroller: ATmega328P with Optiboot (Uno) bootloader
• Clock Speed: 16MHz
• Flash Memory: 32kB
• Digital I/O Pins: 22
• PWM Outputs: 6
• Analogue Inputs: 8
• Interface: UART, I2C, SPI
• Connectivity: USB-C for power and data; barrel jack for 7-15V DC
• Logic Level Switch: 3.3V to 5V
• Fuse: P5