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Arduino Uno Rev3 - module A000066
Original Arduino Uno R3 board with an ATmega328P microcontroller in a socket: for learning electronics, programming and building prototypes.
- 14 digital I/O pins, including 6 with PWM
- 6 analog inputs with a 10-bit converter
- Programming over USB type B in the Arduino IDE
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Original Arduino Uno R3 with ATmega328P
Arduino Uno Rev3 is an original board with an ATmega328P microcontroller in a DIP package, which you can pull out of its socket and replace without soldering. It has 14 digital I/O pins, 6 of which support PWM, i.e. control of the signal duty cycle to adjust LED brightness and motor speed, and 6 analog inputs for reading sensors, e.g. light intensity.
The microcontroller runs at a 16 MHz clock and has 32 kB of Flash memory for the program, 2 kB of SRAM and 1 kB of EEPROM, which is memory that keeps its data after the power is switched off. The board already has a bootloader, so you upload the program from the Arduino IDE over a USB cable, without a separate programmer, from your first blinking LED to controlling a robot.
Original Arduino Uno Rev3 board
14
digital I/O pins, including 6 with PWM
6
analog inputs with a 10-bit converter
32 kB
Flash memory of the ATmega328P microcontroller
7-12 V
recommended supply voltage from the DC jack
Arduino Uno R3 in 360° view
Rotate the board and look at the connectors, the microcontroller in its socket and the pin headers from every side before you connect your first project.
Arduino Uno R3 seen from above
What you will find on the board
The board, measuring 68.6 x 53.4 mm, has a USB type B connector for programming and power, a 5.5 / 2.1 mm DC jack, a reset button and two ICSP connectors. Next to the ATmega328P microcontroller there is an ATmega16U2 chip, which handles communication with the computer over USB.
LEDs indicate power (ON) and serial transmission (TX and RX), and the L LED is connected to pin 13, so you can run your first program without any extra components, e.g. the Blink example from the Arduino IDE, which blinks this LED. The layout of the pin headers fits Arduino Shield add-on boards, which extend the Uno with, for example, motor drivers and displays.
Arduino Uno R3 pinout
| Pin | Function |
|---|---|
| D0 and D1 | UART: receive RX (D0) and transmit TX (D1) |
| D2 and D3 | external interrupts INT0 and INT1 |
| D3, D5, D6, D9, D10, D11 | PWM outputs, marked with ~ on the board |
| D10-D13 | SPI: SS (D10), COPI (D11), CIPO (D12), SCK (D13) |
| D13 | built-in LED (L) |
| A0-A5 | analog inputs of the 10-bit converter, also usable as digital D14-D19 |
| A4 and A5 | I2C: SDA (A4) and SCL (A5), repeated near the AREF pin |
| AREF | reference voltage for the analog inputs |
| IOREF | board logic voltage, connected to 5 V |
| 3V3 | 3.3 V output, max. 50 mA |
| 5V | 5 V output from the board |
| VIN | power input 6 V to 20 V (recommended 7 V to 12 V) |
| RESET | microcontroller reset |
| ICSP | programming the ATmega328P with an external programmer |
ATmega328P pinout diagram
The diagram shows which pins of the microcontroller in the DIP package correspond to the Arduino pins. It will come in handy when you move a finished project from the board to a standalone ATmega328P chip. Special pin functions are described step by step in our guide to Arduino pins, and you will find the manufacturer's full pinout in the links at the bottom of the page.
ATmega328P pin functions on the Arduino Uno board
Arduino Uno R3 with USB type B connector and DC jack
Power from USB, a power supply or a battery
You can power the board from a computer over USB type B or from a power supply with a voltage of 7 V to 12 V and a 5.5 / 2.1 mm plug. The manufacturer states that a standard 9 V battery also fits the DC jack. The USB port is protected by a 500 mA polymer fuse, which protects the computer port against short circuits and overload and resets itself once the cause is removed.
The digital pins work with 5 V logic, and the manufacturer specifies a maximum current of 20 mA per pin. Connect motors, relays and LED strips through a transistor or a ready-made driver, and power 3.3 V modules from the 3V3 output, which supplies up to 50 mA. You will find power supplies with a voltage of 7 V to 12 V and a matching plug in the power supplies for Arduino category.
Programming in the Arduino IDE without a programmer
The microcontroller has a bootloader preinstalled, i.e. a startup program, so you can upload code over USB from the Arduino IDE or from a browser in the Arduino Cloud Editor. You write programs in the Arduino language based on C and C++, and the environment includes a compiler and a serial port monitor. Installing and launching the environment for the first time is described in our Arduino tutorial.
The ICSP connector lets you program the ATmega328P with an external AVR programmer. The microcontroller is not soldered, so if it is damaged you can replace it with a new ATmega328P in a DIP package, and a chip without a bootloader can be programmed via ICSP. You will find project ideas for the Arduino Uno and step-by-step descriptions on our blog.
Underside of the Arduino Uno R3 board
Botland is an official distributor of the Arduino development platform in Poland. We offer a wide choice of boards, modules and accessories from this popular brand, along with tutorials and a knowledge base for users. All Arduino products presented here are original.
Is it the right choice for you?
A good choice if:
- you are starting to learn electronics and microcontroller programming
- you want to use Arduino Shield add-on boards and ready-made libraries
- you control 5 V modules and need up to 20 mA per pin
Consider another option if:
- you need WiFi and more memory: choose Arduino Uno R4 WiFi
- the board has to fit in a small enclosure: see Arduino Nano
- you are short of digital pins: see Arduino Mega 2560 Rev3
Arduino Uno R3 or Uno R4
| Uno R3 | Uno R4 Minima | Uno R4 WiFi | |
|---|---|---|---|
| Microcontroller | ATmega328P | Renesas RA4M1 (Arm Cortex-M4) | Renesas RA4M1 (Arm Cortex-M4) |
| Clock speed | 16 MHz | 48 MHz | 48 MHz |
| Memory | 32 kB Flash, 2 kB SRAM | 256 kB Flash, 32 kB RAM | 256 kB Flash, 32 kB RAM |
| USB connector | USB type B | USB type C | USB type C |
| VIN input voltage | 6-20 V | 6-24 V | 6-24 V |
| Current per pin | 20 mA | 8 mA | 8 mA |
| Radio module | no | no | ESP32-S3-MINI-1 (WiFi) |
| DAC and CAN | no | yes | yes |
| See | this page | Uno R4 Minima | Uno R4 WiFi |
Fun fact
Experiment without worry
The manufacturer writes that the Uno is a very popular and well-documented board from the Arduino family. It also encourages bold experiments: the microcontroller is not soldered, so in the worst case you can replace the chip for a few dollars and start over. That is why you can connect your first circuits with confidence, and learning from mistakes does not mean buying a new board.
Source: Arduino Docs: UNO R3
Frequently asked questions
How does the Uno R3 differ from the Uno R4?
The Uno R4 has a Renesas RA4M1 processor with a 48 MHz Arm Cortex-M4 core, 256 kB of Flash memory and a USB type C connector, while the Uno R3 has a 16 MHz ATmega328P with 32 kB of Flash. The Uno R3 lets you load a pin with up to 20 mA, and the Uno R4 with up to 8 mA, which matters when driving LEDs.
Is a USB cable included?
No. For programming and powering from a computer you need a USB type A to USB type B cable, i.e. the same kind that fits many printers.
What power supply fits the Uno R3?
A power supply with a voltage of 7 V to 12 V and a 5.5 / 2.1 mm plug. The manufacturer allows 6 V to 20 V on the VIN input and states that the DC jack works with a standard 9 V battery connected through a cable with a 5.5 / 2.1 mm plug.
What are the dimensions of the Arduino Uno?
The board measures 68.6 x 53.4 mm and weighs 25 g, and the pin headers are arranged so that Arduino Shield add-on boards fit them without adapters.
Can the microcontroller be replaced?
Yes. The ATmega328P is not soldered to the board, so you can pull it out of its socket and insert a new one. A new chip without a bootloader can be programmed through the ICSP connector on the board with an external AVR programmer.
Technical specification
| Parameter | Value |
|---|---|
| Microcontroller | ATmega328P, 16 MHz, DIP package in a socket |
| USB chip | ATmega16U2, 16 MHz |
| Memory | 32 kB Flash, 2 kB SRAM, 1 kB EEPROM |
| Digital inputs/outputs | 14, including 6 with PWM (D3, D5, D6, D9, D10, D11) |
| Analog inputs | 6 (A0-A5), 10-bit converter |
| Interfaces | UART, I2C, SPI, 2 external interrupts (D2, D3) |
| Logic voltage | 5 V |
| Current per pin | max. 20 mA |
| 3.3 V output | max. 50 mA |
| Power supply | USB type B 5 V or DC jack 5.5 / 2.1 mm |
| Input voltage | 7-12 V recommended, 6-20 V limit |
| USB protection | 500 mA polymer fuse |
| On the board | reset button, 2 ICSP connectors, ON, L (pin 13), TX and RX LEDs |
| Operating temperature | -40 °C to 85 °C |
| Dimensions | 68.6 x 53.4 mm |
| Manufacturer code | A000066 |
| Manufacturer | Arduino |
| Weight | 25 g |
Useful links
| Name | Value |
|---|---|
| Voltage to | 7.0 V |
| Voltage from | 12.0 V |
| Voltage output from | 5.0 V |
| Output voltage to | 5.0 V |
| Nominal output voltage | 5.0 V |
| UC - Microcontroller | ATmega328 |
| UC - Core | 8-bit AVR |
| UC - EEPROM | 1 kB |
| UC - Flash | 32 kB |
| UC - RAM | 2 kB |
| UC - core | 1. Single Core |
| UC - Digital pins | 14 |
| UC - analog in | 6 |
| UC - freq | 16 MHz |
| UC - A/C | 10-bit |
| UC - PWM | 6 |
| UC - USB | USB B |
| UC - I2C | yes |
| UC - UART | yes |
| UC - SPI interface | yes |
| Width | 6 cm |
| Height | 2.6 cm |
| Depth | 8.3 cm |
| Weight | 0.048 kg |
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If the product does not meet your expectations, you have 30 days from receiving the parcel to withdraw from the contract. The product only has to be complete. The right of return belongs to consumers (a purchase unrelated to business activity).
Complaints
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Question: Hello, does the arduino uno kit include a board stand? USB cable can be A-B printer cable of course?
It comes with a plastic pad.
USB A-B cable, something like this:
https://botland.com.pl/477-przewody-usb-a-b
is also very often used in printers.
Question: Good morning I have a question if the kit includes a cable to connect the board to the computer
https://botland.com.pl/477-przewody-usb-a-b
Instructions and documents
GPSR data
Comparison of Arduino
| Model | Microcontroller | Pins | Memory Flash RAM EEPROM | Power | Interfaces |
|---|---|---|---|---|---|
 Uno R4 Minima | Renesas RA4M1 48 MHz | 14 I/O 6 PWM 6 analog | 256 kB 32 kB - | DC: 6-24V USB: 5V | UART I2C SPI CAN DAC |
 Uno R4 WiFi | Renesas / ESP RA4M1 / 32-S3-Mini 48 MHz / 240 Mhz | 14 I/O 6 PWM 6 analog | 256 kB 32 kB - | DC: 6-24V USB: 5V | UART I2C SPI CAN DAC |
 Uno R3 | ATmega 328 16 MHz | 14 I/O 6 PWM 6 analog | 32 kB 2 kB 1 kB | DC: 7-12V USB: 5V | UART I2C SPI |
 Uno WiFi Rev2 | ATmega 4809 20 MHz | 14 I/O 5 PWM 6 analog | 48 kB 6 kB 256 B | DC: 5-12V USB: 5V | UART I2C SPI |
 Leonardo | ATmega 32u4 16 MHz | 20 I/O 7 PWM 12 analog | 32 kB 2,5 kB 1 kB | DC: 7-12V USB: 5V | UART I2C SPI USB |
 Mega 2560 | ATmega 2560 16 MHz | 54 I/O 15 PWM 16 analog | 256 kB 8 kB 4 kB | DC: 7-12V USB: 5V | UART I2C SPI |
 Due ARM Cortex | AT91SAM 3X8E 84 MHz | 54 I/O 12 PWM 12 analog | 512 kB 96 kB - | DC: 7-12V USB: 5V | UART I2C SPI USB CAN DMA |
 Giga R1 WiFi | STM 32H747XI 480 MHz + 240 MHz | 75 I/O 12 PWM 12 analog | 2 MB 1 MB - | DC: 6-24V USB: 5V | UART I2C SPI CAN |
 Zero | ARM ATSAMD21G18 48 MHz | 20 I/O 10 PWM 6 analog | 256 kB 32 kB - | DC: 7-12V USB: 5V | UART I2C SPI |
 Micro | ATmega 32u4 16 MHz | 20 I/O 7 PWM 12 analog | 32 kB 2,5 kB 1 kB | DC: 7-12V USB: 5V | UART I2C SPI |
 Nano | ATmega 328 16 MHz | 22 I/O 6 PWM 8 analog | 32 kB 2 kB 1 kB | DC: 7-12V USB: 5V | UART I2C SPI |
 Pro 328 5V/16MHz | ATmega 328 16 MHz | 14 I/O 6 PWM 6 analog | 32 kB 2 kB 1 kB | DC: 7-12V USB: 5V | UART I2C SPI |
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