SparkFun RedBoard Plus

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The RedBoard Plus suits learners and builders who want an Arduino Uno-style workflow with a USB-C connection and convenient access to Qwiic devices. Its ATmega328P controller runs with the Uno bootloader, while a physical switch selects 3.3 V or 5 V I/O operation. The board also exposes additional analog connections and retains an R3-compatible shield layout. Use it as a controller for a planned circuit or robotics project, pairing the board with sensors, a suitable motor driver and a power supply selected for that build.

Specifications

Microcontroller	ATmega328P; Optiboot Uno bootloader
Clock and flash	16 MHz; 32 kB flash
USB	USB-C; CH340G serial converter
I/O	22 digital I/O; six PWM outputs; eight analog inputs
Expansion	One Qwiic connector; R3-compatible shield layout
Power input	USB-C 5 V or barrel input 7–15 V

Supplier price checked October 23, 2026: US$29.50; listed in stock at SparkFun. Price and availability may change. SparkFun confirms taxes, shipping, delivery and returns at its checkout.

Before you buy

Set the I/O voltage for the attached hardware. This is a development board, not a complete robot or starter kit.

Check current price, availability, taxes, shipping and returns at SparkFun before ordering.

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Official product specifications and documentation

Product photograph: SparkFun Electronics, used with permission.