Arduino UNO R3 Board Without Cable
The Arduino Uno R3 is one of the most widely used and beginner-friendly microcontroller development boards. It is based on the ATmega328P microcontroller and designed to provide a simple and flexible platform for electronics projects. With an easy-to-use USB interface, the board connects directly to a computer for uploading code and powering projects.
The Uno R3 features 14 digital input/output pins (6 of which can provide PWM output) and 6 analog inputs, giving flexibility for sensors, actuators, and external devices.
Key Features:
Operating voltage: 5V, powered via USB or external supply (7-12V)
14 digital I/O pins, including 6 PWM outputs
6 analog inputs with 10-bit resolution
32 KB flash memory (5 KB used by bootloader)
2 KB SRAM and 1 KB EEPROM
Serial interfaces: UART, SPI, I2C
Built-in LED on pin 13
USB B-type connector for easy programming
DC power jack (5.5 x 2.1 mm)
The board automatically selects the power source if both USB and external power are connected. Using a voltage higher than 12V may cause overheating due to regulator stress.
The included pinout diagram shows the common functions of each pin, but some pins have multiple uses. For full details, please check the official Arduino documentation.
This version uses a DIP microcontroller in a socket, which makes replacing the chip simple if damaged. It also includes the original Atmega16U2 USB converter, ensuring maximum compatibility with Arduino software.
Technical Specifications
| Specification | Details |
|---|---|
| Microcontroller | ATmega328P |
| USB Converter | Atmega16U2 |
| Operating Voltage | 5V |
| Recommended Input Voltage | 7-12V |
| Digital I/O Pins | 14 |
| PWM Pins (shared with Digital I/O) | 6 |
| Analog Input Pins | 6 |
| Max Current per I/O Pin | 20mA |
| Max Current from 3.3V Pin | 50mA |
| Flash Memory | 32 KB |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Clock Speed | 16 MHz |
| Built-in LED | On Pin 13 |
| USB Connector Style | B-Type Female |
| Board Size (PCB) | 68.8 x 53.4 mm |
| Board Size (with connectors) | 77 x 53.4 mm |
| Country of Manufacture | China |
Pin Out
