Description
If a tutorial says “connect this to pin 9”, it almost certainly means an Uno. The R3 is the reference Arduino board: forgiving to wire, impossible to outgrow quickly, and the one every classroom example, shield and library assumes.
Key features
- ATmega328P microcontroller the reference Arduino chip
- 14 digital I/O pins six of them PWM capable
- 6 analog inputs read sensors directly, no extra hardware
- USB programming and power one cable to code and run
- Widest shield compatibility the largest add-on ecosystem of any board
- Classroom-proven the board most course material is written against
Learning resources
Programming: Arduino IDE, C/C++
Tutorial languages: English
Specifications
| Specification | Detail |
|---|---|
| SKU | MCU-UNO |
| Microcontroller | ATmega328P |
| Digital I/O | 14 pins (6 PWM) |
| Analog inputs | 6 |
| Connection | USB Type-B |
| Programming | Arduino IDE |
| Best for | First projects, classroom teaching, shield-based builds |
Frequently Asked Questions
Is this the right board to start with?
For most people, yes. More course material, more tutorials and more compatible add-ons are written for the Uno than for any other board.
Uno or ESP32?
Start on the Uno if you are learning electronics and following a course. Choose the ESP32 if the project needs WiFi or Bluetooth.
What do I need besides the board?
A USB Type-B cable and a computer running the free Arduino IDE.
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