The OSEPP UNO R4 Plus board is one of the most popular Arduino boards out in the market! This board uses the 8-bit, AVR, RISC-based ATmega328P microcontroller from Microchip (formally Atmel) and offers many improvements over the base Arduino Uno design.
- Four additional 5V and GND power pins.
- Two additional analog pins, A6 & A7.
- Upgraded ATmega 16U2 chipset.
- Powered by either USB or a DC power jack.
- Built-in ICSP (in-circuit serial programming) header for programming the microcontroller.
- Compatible with all Arduino software and hardware made for the Arduino Uno.
| Specifications | |
| Catalog No. | 2760438 |
| Mfg. Part No. | UNO-04 |
| Microcontroller | ATmega328P |
| Flash Memory | 32KB |
| SRAM | 2KB |
| EEPROM | 1KB |
| Operating Voltage | 5V |
| Input Voltage | 6 to 12V |
| Digital I/O Pin Count | 14 (Including 6 for PWM Output) |
| Analog Input Pin Count | 8 |
| Other Connections | Micro USB ICSP for ATmega328P DC Power Connector 4-Pin I²C Connector |
| Dimensions | 2.95 × 2.13 × 0.61" (75 × 54 × 15.5mm) |
| UPC | 667510001431 |
Note: This board is based off of the Arduino Uno designed by Arduino.cc, and is released under the Creative Commons Attribution Share-Alike License. The original design can be found at http://arduino.cc/en/Main/ArduinoBoardUno.
Technical Schematic (PDF)
⚠️ WARNING: CHOKING HAZARD: Small parts. Not for children under 3 yrs.

