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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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'''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.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL12256 WSAL12256 – AlphaBot, Bluetooth robot building kit for Arduino]
* [https://shop.jw-tech.eu/p/WSAL12257 WSAL12257 – AlphaBot, Basic robot building kit for Arduino]
* [https://shop.jw-tech.eu/p/WSAL12910 WSAL12910 – AlphaBot2 robot building kit for Arduino]
* [https://shop.jw-tech.eu/p/WSAL12911 WSAL12911 – AlphaBot2 robot building kit for Arduino (no Arduino controller)]
* [https://shop.jw-tech.eu/p/WSAL19287 WSAL19287 – ATMEGA328P Microcontroller Development Board, Arduino-Compatible]
* [https://shop.jw-tech.eu/p/WSAL19288 WSAL19288 – ATMEGA328P Microcontroller Development Board, Arduino-Compatible]

== 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:'''
<syntaxhighlight lang="text">
-P ft0
</syntaxhighlight>

== 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 ==
* [https://www.waveshare.com/wiki/R3_PLUS R3 PLUS - Waveshare Wiki]
* Source revision: 70074
* Captured: 2026-08-30T03:23:48+00:00
* SHA-256: <code>aaa19894bc79b51d0dba63aa20b4daf1bd47cc10ce96e95a48c8ad883cefed4b</code>

WSAL12256 – R3 PLUS/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex