Official uno has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started.. You can tinker with your UNO without worrying too much about doing something wrong, worst case scenario you can replace the chip for a few dollars and start over again.
“Uno” means one in Italian and was chosen to mark the release of Arduino Software (IDE) 1.0. The Uno board and version 1.0 of Arduino Software (IDE) were the reference versions of Arduino, now evolved to newer releases. The Official Arduino Uno Rev3 board is the first in a series of USB Arduino boards and the reference model for the Arduino platform; for an extensive list of current, past or outdated boards see the Arduino index of boards.
Getting Started
You can find in the Getting Started section all the information you need to configure your board, use the Arduino Software (IDE), and start tinker with coding and electronics.
Looking for More Power, Speed & Connectivity?
Upgrade to the Arduino UNO R4 EK Minima or UNO R4 EK WiFi and experience the next generation of UNO boards:
| Feature | Arduino UNO R3 | Arduino UNO EK R4 Minima | Arduino UNO EK R4 WiFi |
| Microcontroller | ATmega328P | Renesas RA4M1 (Arm Cortex-M4) | Renesas RA4M1 (Arm Cortex-M4) |
| Wi-Fi/Bluetooth LE | No | No | ESP32-S3-MINI-1-N8 |
| USB Connector | USB-B | USB-C | USB-C |
| Mouse/keyboard emulation | No | Yes | Yes |
| Real-Time Clock | No | Yes | Yes |
| DAC | No | 1 (12-bit) | 1 (12-bit) |
| CAN | No | Yes | Yes |
| Qwiic connector | No | No | Yes |
| OFF pin | No | No | Yes |
| VRTC pin | No | No | Yes |
| LED matrix | No | No | 12×8 (96 red LEDs) |
| Input voltage | 7-12V | 6-24V | 6-24V |
| DC current per I/O Pin | 20mA | 8mA | 8mA |
| Clock speed | 16MHz | 48MHz | 48MHz |
| Memory | 2kB SRAM, 32kB FLASH, 1kB EEPROM | 256kB Flash, 32kB RAM | 256kB Flash, 32kB RAM |
| MCU resolution | 8-bit | 32-bit | 32-bit |
| ADC resolution | 10-bit | 14-bit | 14-bit |
Useful Links
Package Includes:
1 x Official Arduino Uno Rev3 A000066
| Item Type: | Development Board |
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| Model: | Uno |
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| Model No.: | A000066 |
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| Microcontroller: | Atmega |
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| Operating Voltage (VDC): | 5 |
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| Input Voltage (V): | 7-12V |
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| Analog I/O Pins | 6 |
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| Digital I/O Pins | 14 (of which 6 provide PWM output) |
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| PWM Digital I/O Pins | 6 |
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| Clock Speed | 16 MHz |
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| Flash Memory: | 32 KB |
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| SRAM | 2 |
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| EEPROM | 1 KB (ATmega328P) |
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| DC Current for 3.3V Pin(mA) | 50 |
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| DC Current per I/O Pin (mA) | 20 mA |
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| On Board LED | Yes |
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| Operating Temperature (°C): | -10 to 60 |
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| Weight (g): | 25 |
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| Length (mm): | 68.6 |
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| Width (mm): | 53.4 |
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| Height (mm): | 12.5 |
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| Shipping Weight | 0.05 kg |
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| Shipping Dimensions | 9 × 6 × 3 cm |
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