The R3 Plus is Waveshare's very own Arduino-compatible ATmega328P-based development board. Arduino-compatibles are a great way to find something a little different for your project - ideal when you need a specific feature or function. Waveshare designed the R3 Plus with a huge number of subtle but useful changes to the default R3 design including dual voltage levels, low-profile power connectors, lateral switches and more - see the full feature list below! A Micro-USB cable is included with the board. Features * Dual voltage levels - Supports 5V and 3.3V * Lateral reset button - Easier to access when using shields * Bootloader switch - The board can be configured to run a program immediately when power-up by the switch * Micro-USB Connector - A more common USB interface and keeps the board low profile for shields * Low-profile DC jack - Contributes to the low profile of the board, avoids shield blocking * Power output header - A dedicated 3.3/5V and GND header for your projects and common grounding * 3.3V Power Output - A boost to the norm, with 800mA driving capability * Crystal Oscillator - For accurate clock references * 8 ADC channels - more ADC pins for your project. CFG used as ADC6 by configuration and ADC7 from the reserved pin. * Solder Pads - Pads are provided for DIY project wiring where required * FT232 USB Driver - more compatible with mainstream Operating Systems * Firmware Fixing - Firmware can be fixed by using the onboard FT232, no extra programmer is required * Dimensions: 66.04mm x 53.34mm What's Onboard * 1) ATMEGA328P-AU * 2) AMS1117-3.3 * 3.3V voltage regulator * 3) NCP1117ST50T3G * 5V voltage regulator * 4) FT232RL * USB to UART convertor * 5) Arduino interface * Compatible with standard Arduino interface with two additional analog inputs A6 (config the CFG), A7 * Solder pads provided, supports prototype breadboard * 6) ICSP interface * 7) Micro-USB connector * For uploading program OR serial port debugging * 8) Power output header * 3.3V OR 5V, voltage level configured by the onboard power configuration switch, used as power output OR common-grounding with other boards * 9) FT232 pins * For burning Bootloader into the microcontroller * 10) DC input * 7V ~ 12V * 11) Reset button * 12) Power indicator * 13) Serial port Rx/Tx indicator * 14) User LED * 15) 500mA fast auto-recovery fuse * 16) Power configuration * For configuring the operating voltage * 17) Bootloader selection switch * Turn ON: the board will reset when power-up OR other USB devices were detected connecting to the PC * Turn OFF: the onboard program runs immediately when power-up, and the board will not reset when other USB devices were detected connecting to the PC Pinout Package Contents * 1x R3 Plus * 1x Micro-USB cable https://elecena.pl/product/22721321/r3-plus-arduino-compatible-atmega328p-development-board 2023-03-07 https://elecena.pl/product/22721321/r3-plus-arduino-compatible-atmega328p-development-board 2023-12-27 https://elecena.pl/product/22721321/r3-plus-arduino-compatible-atmega328p-development-board 2024-04-30 https://elecena.pl/product/22721321/r3-plus-arduino-compatible-atmega328p-development-board 2024-09-19 https://elecena.pl/product/22721321/r3-plus-arduino-compatible-atmega328p-development-board 2024-11-29 https://elecena.pl/product/22721321/r3-plus-arduino-compatible-atmega328p-development-board 2024-11-30 https://elecena.pl/product/22721321/r3-plus-arduino-compatible-atmega328p-development-board 2025-08-05 https://elecena.pl/product/22721321/r3-plus-arduino-compatible-atmega328p-development-board 2025-11-28 https://elecena.pl/product/22721321/r3-plus-arduino-compatible-atmega328p-development-board 2025-11-29 https://elecena.pl/product/22721321/r3-plus-arduino-compatible-atmega328p-development-board 2026-01-07