WSAL12256 – R3 PLUS/en

Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The Waveshare R3 PLUS is an Arduino UNO R3 compatible development board featuring an onboard ATMEGA328P-AU microcontroller, a 16 MHz oscillator and a USB serial interface via the FT232RL. It provides Arduino-compatible headers, an ICSP connector, voltage output and power/bootloader configuration switches.

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Technical overview

Microcontroller: Atmel AVR 8-bit chip from the ATMEGA328P family using a RISC architecture concept.
Up to 20 MIPS throughput at a 20 MHz clock frequency.
32 KB of in-system programmable flash memory and 2 KB of internal SRAM.
Two voltage regulators: AMS1117-3.3 for 3.3 V and NCP1117ST50T3G for 5 V.
FT232RL USB-to-UART converter enables serial communication and bootloader programming.
Header is compatible with the standard Arduino interface plus two additional analog inputs A6 and A7 (via solder pads).
The ICSP connector can also be used as an SPI interface; the FT232 pins are used for flashing the bootloader.
The power configuration switch selects the output voltage between 3.3 V and 5 V; the DC input range is 7 V to 12 V.
Bootloader selection switch: when ON, the board resets on power-up or when other USB devices are detected; when OFF, the running program starts immediately and ignores other USB devices.

Commands and examples – verify before use:

-P ft0

Notes and version constraints

The exact pinouts are only listed as a heading without a figure in the source; please verify against the official pinout table.
The recommended fuse values (high=0xde, low=0xff, extended=0x05, lock=0x0F, unlock=0x3F) are version-sensitive; read the current values before writing them.
When flashing the bootloader, the COM port must be between COM1 and COM4; otherwise errors may occur.
The described workflow uses avrdude-GUI and a specific hex file (optiboot_atmega328-Mini.hex); different IDE versions may have different paths.
Powering the board via USB or external VIN (6–12 V) requires appropriate cables or power supplies; not further specified in the text.

Source and revision record

R3 PLUS - Waveshare Wiki
Source revision: 70074
Captured: 2026-08-30T03:23:48+00:00
SHA-256: aaa19894bc79b51d0dba63aa20b4daf1bd47cc10ce96e95a48c8ad883cefed4b