Arduino Uno is an open-source microcontroller board based on the ATmega328P. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator (CSTCE16M0V53-R0), 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 a AC-to-DC adapter or battery to get started. You can tinker with your Uno without worring 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 Uno 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of USB Arduino boards, and the reference model for the Arduino platform; for an extensive list of current, past or outdated boards see the Arduino index of boards.
Specifications
Microcontroller
ATmega328P
Operating Voltage
5 V
Input Voltage (recommended)
7-12 V
Input Voltage (limit)
6-20 V
Digital I/O Pins
14 (of which 6 provide PWM output)
PWM Digital I/O Pins
6
Analog Input Pins
6
DC Current per I/O Pin
20 mA
DC Current for 3.3 V Pin
50 mA
Flash Memory
32 KB (ATmega328P) of which 0.5 KB used by bootloader
SRAM
2 KB (ATmega328P)
EEPROM
1 KB (ATmega328P)
Clock Speed
16 MHz
LED_BUILTIN
13
Dimensions
68.6 x 53.4 mm
Weight
25 g
The Arduino Uno R4 is powered by the Renesas RA4M1 32-bit ARM Cortex-M4 processor, providing a significant boost in processing power, memory, and functionality. The WiFi version comes with an ESP32-S3 WiFi module in addition to the RA4M1, expanding creative opportunities for makers and engineers. The Uno R4 Minima is an affordable option for those who don't need the additional features.
The Arduino Uno R4 runs at 48 MHz, which provides a 3x increase over the popular Uno R3. Additionally, SRAM has been upgraded from 2 kB to 32 kB, and flash memory from 32 kB to 256 kB to support more complex projects. Responding to community feedback, the USB port is now USB-C, and the maximum power supply voltage has been raised to 24 V with an enhanced thermal design. The board includes a CAN bus and an SPI port, enabling users to reduce wiring and perform parallel tasks by connecting multiple shields. A 12-bit analog DAC is also provided on the board.
The Arduino Uno R4 comes in 2 versions (Minima and WiFi) and offers the following new features compared to the Uno R3:
Arduino Uno R4 Minima
Arduino Uno R4 WiFi
USB-C connector
USB-C connector
RA4M1 from Renesas (Cortex-M4)
RA4M1 from Renesas (Cortex-M4)
HID device (emulate a mouse or a keyboard)
HID device (emulate a mouse or a keyboard)
Improved power section (up to 24 V through VIN)
Improved power section (up to 24 V through VIN)
CAN bus
CAN bus
DAC (12 bits)
DAC (12 bits)
Op amp
Op amp
WiFi/Bluetooth LE
Fully-addressable LED matrix (12x8)
Qwiic I²C connector
RTC (with support for a buffer battery)
Runtime errors diagnostics
Model Comparison
Uno R3
Uno R4 Minima
Uno R4 WiFi
Microcontroller
Microchip ATmega328P (8-bit AVR RISC)
Renesas RA4M1 (32-bit ARM Cortex-M4)
Renesas RA4M1 (32-bit ARM Cortex-M4)
Operating Voltage
5 V
5 V
5 V
Input Voltage
6-20 V
6-24 V
6-24 V
Digital I/O Pins
14
14
14
PWM Digital I/O Pins
6
6
6
Analog Input Pins
6
6
6
DC Current per I/O Pin
20 mA
8 mA
8 mA
Clock Speed
16 MHz
48 Mhz
48 Mhz
Flash Memory
32 KB
256 KB
256 KB
SRAM
2 KB
32 KB
32 KB
USB
USB-B
USB-C
USB-C
DAC (12 bit)
–
1
1
SPI
1
2
2
I²C
1
2
2
CAN
–
1
1
Op amp
–
1
1
SWD
–
1
1
RTC
–
–
1
Qwiic I²C connector
–
–
1
LED Matrix
–
–
12x8 (96 red LEDs)
LED_BUILTIN
13
13
13
Dimensions
68.6 x 53.4 mm
68.9 x 53.4 mm
68.9 x 53.4 mm
Downloads
Datasheet
Schematics
Add this board to a device and you'll be able to connect it to a WiFi network, using its secure ECC608 crypto chip accelerator. The Arduino Uno WiFi is functionally the same as the Arduino Uno Rev3, but with the addition of WiFi/Bluetooth and some other enhancements. It incorporates the brand new ATmega4809 8-bit microcontroller from Microchip and has an onboard IMU (Inertial Measurement Unit) LSM6DS3TR.
The Wi-Fi Module is a self-contained SoC with an integrated TCP/IP protocol stack that can provide access to a Wi-Fi network, or act as an access point.
The Arduino Uno WiFi Rev2 has 14 digital input/output pins (5 that can be used as PWM outputs, 6 analog inputs), 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 adapter or battery to get started.
Specifications
Operating Voltage
5 V
Input Voltage
7 V - 12 V
Digital I/O
14
Analog Input Pins
6
Analog Input Pins
6
DC Current per I/O Pin
20 mA
DC Current for 3.3 V Pin
50 mA
Flash Memory
48 KB
SRAM
6.144 Bytes
EEPROM
256 Bytes
Clock Speed
16 MHz
Radio Module
u-blox NINA-W102
Secure Element
ATECC608A
Inertial Measurement Unit
LSM6DS3TR
LED_Builtin
25
Length
101.52 mm
Width
53.3 mm
Weight
37 g
With this kit you can built all the projects described in the book 'Mastering the Arduino Uno R4'. The kit comes with several LEDs, sensors, actuators, and other components. The purpose of the kit is to make a flying start with hardware and software aspects of projects designed around the Arduino Uno microcontroller system.
Included
1x RFID reader module
1x DS1302 clock module
1x 5 V stepper motor
1x '2003' stepper motor drive board
5x Green LED
5x Yellow LED
5x Red LED
2x Rocker switch
1x Flame sensor
1x LM35 sensor module
1x Infrared receiver
3x Light-dependent resistors (LDRs)
1x IR remote controller
1x Breadboard
4x Pushbutton (with four caps)
1x Buzzer
1x Piezo sounder
1x Adjustable resistor (potentiometer)
1x 74HC595 shift register
1x 7-segment display
1x 4-digit 7-segment display
1x 8x8 Dot-matrix display
1x 1602 / I²C LCD module
1x DHT11 Temperature and humidity module
1x Relay module
1x Sound module
Set of Dupont cables
Set of Breadboard cables
1x Water sensor
1x PS2 Joystick
5x 1 k-ohm resistor
5x 10 k-ohm resistor
5x 220-ohm resistor
1x 4x4 keypad module
1x 9g Servo (25 cm)
1x RFID card
1x RGB module
1x 9 V battery DC jack
Not included
Mastering the Arduino Uno R4 (Book)
Arduino Uno R3/R4 (Board)
The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Additional features coming with the R3 version are: ATmega16U2 instead of 8U2 as a USB-to-Serial converter. 1.0 pinout: added SDA and SCL pins for TWI communication placed near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board and the second one is a not connected pin, that is reserved for future purposes. stronger RESET circuit. Microcontroller ATmega328P Operating Voltage 5 V Input Voltage 7 V - 12 V Digital I/O Pins 14 PWM Pins 6 Analog Input Pins 8 DC Current per I/O Pin 20 mA DC Current for 3.3 V Pin 50 mA Flash Memory 32 KB (ATmega328P) of which 0.5 KB used by bootloader SRAM 2 KB EEPROM 1 KB Clock Speed 16 MHz LED_Builtin 13 Length 68.6 mm Width 53.4 mm Weight 25 g
Programming and Projects for the Minima and WiFi
Based on the low-cost 8-bit ATmega328P processor, the Arduino Uno R3 board is likely to score as the most popular Arduino family member so far, and this workhorse has been with us for many years. Recently, the new Arduino Uno R4 was released, based on a 48-MHz, 32-bit Cortex-M4 processor with a huge amount of SRAM and flash memory. Additionally, a higher-precision ADC and a new DAC are added to the design. The new board also supports the CAN Bus with an interface.
Two versions of the board are available: Uno R4 Minima, and Uno R4 WiFi. This book is about using these new boards to develop many different and interesting projects with just a handful of parts and external modules, which are available as a kit from Elektor. All projects described in the book have been fully tested on the Uno R4 Minima or the Uno R4 WiFi board, as appropriate.
The project topics include the reading, control, and driving of many components and modules in the kit as well as on the relevant Uno R4 board, including
LEDs
7-segment displays (using timer interrupts)
LCDs
Sensors
RFID Reader
4×4 Keypad
Real-time clock (RTC)
Joystick
8×8 LED matrix
Motors
DAC (Digital-to-analog converter)
LED matrix
WiFi connectivity
Serial UART
CAN bus
Infrared controller and receiver
Simulators
… all in creative and educational ways with the project operation and associated software explained in great detail.
Celebrating the Arduino Uno with a miniaturized limited edition
The world's favorite development board has gone mini. Everything in this version of the Arduino Uno is unique. Black and gold, finishing, elegant design and packaging, all delivered to the highest standard. A little jewel to celebrate the Arduino community and what we’ve been doing together for all these years.
Each item is unique and numbered on the PCB, and includes a hand-signed letter from the founders. It’s a limited edition, so get while it’s in stock!
For serious Arduino Uno lovers
Arduino Uno Mini Limited Edition is a collector’s item for serious Arduino Lovers: hobbyists, students, makers, reimaginers, dreamers, hopers, fans, engineers, designers, questioners, cake-makers, problem-solvers, puzzlers, gamers, debaters, developers, entrepreneurs, architects, future-shapers, musicians, scientists... 10 million projects based on (official) Uno boards that have contributed to this incredible story.
Specifications
The Arduino Uno Mini Limited Edition is a microcontroller board based on the ATmega328P. It has 14 digital inputs/outputs (six of which can be used as PWM outputs), six analog inputs, a 16 MHz ceramic resonator, a USB-C connector, and a reset button. Contains everything needed to support the microcontroller. Simply connect it to a computer with a USB cable, use a power adapter, or connect a battery to get started.
Microcontroller
ATmega328P
USB connector
USB-C
Built-in LED Pins
13
Digital I/O Pins
14
Analog Input Pins
6
PWM Pins
6
UART
Yes
I²C
Yes
SPI
Yes
Circuit operating voltage
5 V
Input Voltage (limit)
6-12 V
Battery connector
None
DC current per I/O Pin
20 mA
DC current for 3.3 V Pin
50 mA
Main processor
ATmega328P (16 MHz)
USB-serial processor
ATmega16U2 (16 MHz)
Memory ATmega328P
2 KB SRAM, 32 KB Flash, 1 KB EEPROM
Weight
8.05 g
Dimensions
26.70 x 34.20 mm
Downloads
Datasheet
Learn the basics of electronics by assembling manually your Arduino Uno, become familiar with soldering by mounting every single component, and then unleash your creativity with the only kit that becomes a synth!
The Arduino Make-Your-Uno kit is really the best way to learn how to solder. And when you are done, the packaging allows you to build a synth and make your music.
A kit with all the components to build your very own Arduino Uno and audio synthesizer shield.
The Make-Your-Uno kit comes with a complete set of instructions in a dedicated content platform. This includes video material, a 3D interactive viewer for following detailed instructions, and how to program your board once it is finished.
This kit contains:
Arduino Make-Your-Uno
1x Make-Your-Uno PCB
1x USB C Serial adapter Board
7x Resistors 1k Ohm
2x Resistors 10k Ohm
2x Resistors 1M Ohm
1x Diode (1N4007)
1x 16 MHz Crystal
4x Yellow LEDs
1x Green LED
1x Push-Button
1x MOSFET
1x LDO (3.3 V)
1x LDO (5 V)
3x Ceramic capacitors (22pF)
3x Electrolytic capacitors (47uF)
7x Polyester capacitors (100nF)
1x Socket for ATMega 328p
2x I/O Connectors
1x Connector header 6 pins
1x Barrel jack connector
1x ATmega 328p Microcontroller
Arduino Audio Synth
1x Audio Synth PCB
1x Resistor 100k Ohm
1x Resistor 10 Ohm
1x Audio amplifier (LM386)
1x Ceramic capacitors (47nF)
1x Electrolytic capacitors (47uF)
1x Electrolytic capacitors (220uF)
1x Polyester capacitor (100nF)
4x connectors pin header
6x potentiometer 10k Ohm with plastic knobs
Spare parts
2x Electrolytic capacitors (47uF)
2x Polyester capacitor (100nF)
2x Ceramic capacitors (22pF)
1x Push-Button
1x Yellow LEDs
1x Green LED
Mechanical parts
5x Spacers 12 mm
11x Spacers 6 mm
5x screw nuts
2x screws 12 mm
Designed with convenience and security in mind, the Ardi RFID Shield is based on the EM-18 module, operating at a frequency of 125 KHz. This shield allows you to easily integrate RFID (Radio Frequency Identification) technology into your projects, enabling seamless identification and access control systems.
Equipped with a powerful 1-channel optoisolated relay, the Ardi RFID Shield offers a reliable switching solution with a maximum DC rating of 30 V and 10 A, as well as an AC rating of 250 V and 7 A. Whether you need to control lights, motors, or other high-power devices, this shield provides the necessary functionality.
Additionally, the Ardi RFID Shield features an onboard buzzer that can be utilized for audio feedback, allowing for enhanced user interaction and system feedback. With the onboard 2-indication LEDs, you can easily monitor the status of RFID card detection, power supply, and relay activation, providing clear visual cues for your project's operation.
Compatibility is key, and the Ardi RFID Shield ensures seamless integration with the Arduino Uno platform. Paired with a read-only RFID module, this shield opens up a world of possibilities for applications such as access control systems, attendance tracking, inventory management, and more.
Features
Onboard 125 kHz EM18 RFID small, compact module
Onboard High-quality relays Relay with Screw terminal and NO/NC interfaces
Shield compatible with both 3.3 V and 5 V MCU
Onboard 3 LEDs power, relay ON/OFF State and RFID Scan status
Multi-tone Buzzer onboard for Audio alerts
Mounts directly onto ArdiPi, Ardi32 or other Arduino compatible boards
Specifications
RFID operating Frequency: 125 kHz
Reading distance: 10 cm, depending on TAG
Integrated Antenna
Relay Max Switching Voltage: 250 V AC/30 V DC
Relay Max Switching Current: 7 A/10 A
The Ardi Display Shield features a vibrant 2" IPS screen with a resolution of 240 x 320 pixels, providing sharp and crisp visuals for your projects. Whether you're working on a small-scale project or a complex prototype, this display shield ensures clear and vibrant display output.
With 2 programmable buttons, you have the flexibility to create interactive experiences and user-friendly interfaces. Customize the buttons to trigger specific actions or navigate through menus effortlessly.
The possibilities are endless, limited only by your imagination. In addition to the programmable buttons, the Ardi Display Shield also includes a 5-way joystick for intuitive control. With the joystick's SPI interface, you can easily navigate menus, scroll through options, and control various aspects of your Arduino project with precision and ease.
Designed with compatibility and ease of use in mind, the Ardi Display Shield seamlessly integrates with the Arduino Uno board. Simply connect it to your Arduino Uno and unlock a world of possibilities for visual feedback, user interaction, and data visualization.
Features
Onboard 2.0" TFT Display
Compatible with 3.3 V/5 V MCU, Selection provided
Onboard 5-Way Joystick allows better control-related projects
Two programmable Buttons to add additional functionality to project
Mounts directly onto ArdiPi, Ardi32 or other Arduino compatible boards
Specifications
Display resolution: 240x320 pixels
Pixel Pitch: 0.1275 x 0.1275 mm
Active Area: 30.6 x 40.8 mm
Module Size: 34.6 x 47.8 x 2.05 mm
SPI Interface
Display Colors: 65K colors
Drive IC: ST7789V2
Viewing Direction: All-view the best image
A Reference and User Guide for the Arduino Uno Hardware and Firmware
A manual providing up-to-date hardware information for the popular Arduino Uno, the easy to use open-source electronics platform used by hobbyists, makers, hackers, experimenters, educators and professionals.
Get all the information you need on the hardware and firmware found on Arduino Uno boards in this handy reference and user guide.
Ideal for the workbench or desktop
Contains all of the Arduino Uno hardware information in one place
Covers Arduino / Genuino Uno revision 3 and earlier boards
Easily find hardware technical specifications with explanations
Pin reference chapter with interfacing examples
Diagrams and illustrations for easy reference to alternate pin functions and hardware connections
Learn to back up and restore the firmware on the board or load new firmware
Basic fault finding and repair procedures for Arduino Uno boards
Power supply circuits simplified and explained
Mechanical dimensions split into five easy to reference diagrams
Contains circuit diagrams, parts list and board layout reference to locate components easily
Enhance your Arduino projects with the Ardi Relay Shield, a versatile 4-channel optoisolated relay board. Designed to handle AC (250 V, 7 AMP) and DC (30 V, 10 AMP) power, this shield empowers you to easily control a wide range of electrical devices.
Equipped with four LED relay indicators, the Ardi Relay Shield provides visual feedback on the status of each relay, ensuring you stay informed and in control of your circuit. The shield also features four 3-pin screw terminals (NC, NO, COM) for convenient and secure connections.
Designed in the Arduino form factor, this shield seamlessly integrates with your Arduino Uno, allowing you to expand its capabilities and create interactive projects. Whether you're automating home appliances, building intelligent systems, or working on industrial applications, the Ardi Relay Shield is the reliable choice for robust and efficient relay control.
Features
4-channel optoisolated relay so better electrical isolation between High and Low side voltage.
4x Relay shield compatible with both 3.3 V and 5 V MCU
Onboard 4 Status LED to indicate each relay ON/OFF State
High-quality relays
Provides NO/NC interfaces with Screw terminals.
Mounts directly onto ArdiPi, Ardi32 or other Arduino compatible boards
Specifications
Max Switching Voltage: 250 V AC/30 V DC
Max Switching Current: 7 A/10 A
Max Switching Power: 2770 VA/240 W
Frequency: 1 Hz
Initial Contact Resistance: 50 mΩ max at 6 V DC/1 A
Operate Time: 10ms max
Release Time: 5ms max
Life Expectancy Electrical: 100,000 operations (rated load)
Life Expectancy Mechanical: 10,000,000 operations (no load)