- Introduction to Arduino UNO WiFi REV2
- What is the ABX00021 Board?
- Technical Specifications
- 9 Game-Changing Features of the Arduino UNO WiFi REV2
- Applications and Project Ideas
- Arduino UNO WiFi REV2 vs. Classic Arduino UNO
- How to Get Started with ABX00021 (Step-by-Step)
- Expert Tips to Maximize Performance
- Conclusion
Welcome to the future of embedded innovation! The Original Arduino UNO WiFi REV2 ABX00021 is not just a microcontroller board—it’s a gateway to smarter, faster, and more connected projects. Built on the legacy of the legendary Arduino UNO, this board adds native Wi-Fi, enhanced security, and a powerful 8-bit AVR microcontroller—all packed into the same familiar form factor. Whether you’re an IoT developer, electronics enthusiast, or STEM educator, this board is designed to empower your ideas with robust wireless connectivity and ease of use.
- What is the ABX00021 Board?
The Arduino UNO WiFi REV2 (ABX00021) is an official board from Arduino.cc that combines:
- The classic Arduino UNO platform
- An onboard u-blox NINA-W102 Wi-Fi module
- An ATmega4809 microcontroller
- A built-in IMU (Inertial Measurement Unit)
- Enhanced security via ECC608 crypto chip
It’s ideal for those who need the simplicity of UNO but with Wi-Fi and added peripherals for Internet of Things (IoT) projects.
Technical Specifications of Arduino UNO WiFi REV2 ABX00021
Here’s a detailed breakdown of what powers the ABX00021
| Component | Specification |
| Microcontroller | ATmega4809 (AVR 8-bit, 20 MHz) |
| Operating Voltage | 5V |
| Input Voltage (recommended) | 7-12V |
| Digital I/O Pins | 14 (5 can be used as PWM outputs) |
| Analog Input Pins | 6 |
| DC Current per I/O Pin | 20 mA |
| Flash Memory | 48 KB |
| SRAM | 6 KB |
| EEPROM | 256 bytes |
| Wi-Fi Module | u-blox NINA-W102 (2.4GHz 802.11b/g/n) |
| Crypto Chip | Microchip ECC608 for hardware security |
| IMU Sensor | 6-axis (LSM6DS3TR-C) accelerometer + gyroscope |
| USB Interface | MicroUSB |
| Dimensions | 68.6 mm × 53.4 mm |
9 Game-Changing Features of the Arduino UNO WiFi REV2 ABX00021
Here’s why this board stands out from the crowd:
- Built-in Wi-Fi with Secure Communication
No need for external shields. The NINA-W102 Wi-Fi module offers fast, stable wireless communication, and with TLS/SSL support, your data is safe during transmission.
- Enhanced Processing Power (ATmega4809)
With the upgraded ATmega4809, you get:
- More I/O flexibility via peripheral pin multiplexing
- Additional SRAM for larger programs
- Faster execution for real-time applications
- Hardware-Level Security via ECC608
In a world of increasing cyber threats, this chip ensures secure key storage and cryptographic authentication, making it ideal for smart home and industrial IoT applications.
The built-in 6-axis IMU opens up new possibilities in motion sensing, orientation detection, and gesture recognition—perfect for robotics, wearable tech, and smart navigation systems.
- UNO-Compatible Form Factor
Despite the enhancements, the board retains the same pinout and size as Arduino UNO, ensuring backward compatibility with shields, enclosures, and project designs.
- USB Programmable and Arduino IDE Support
Just plug in via USB and code in the official Arduino IDE. Wi-Fi programming and OTA (Over-the-Air) updates are also supported for remote development.
- Robust Wireless Range and Reliability
Thanks to the u-blox chip, the board offers better antenna design, lower power consumption, and stable signal strength—even in congested networks.
- Breadboard-Friendly and Easy to Integrate
With standard headers, it fits into any breadboard-based circuit or solderable prototype system. Great for students, educators, and prototypers.
- Backed by Arduino Community and Documentation
Being an official Arduino product means you have access to a massive user community, excellent documentation, and hundreds of compatible libraries.
Applications and Project Ideas with Arduino UNO WiFi REV2 ABX00021
Unleash your creativity with these WiFi-powered project ideas:
- Wi-Fi Temperature Logger using DHT11/22 sensors
- Home Automation System (e.g., turning on lights with your smartphone)
- Motion-Triggered Alert System using the onboard IMU
- Smart Plant Monitor (send soil moisture data to Google Sheets)
- Web Server to control appliances remotely
- IoT Door Lock with real-time monitoring
- Health Tracker (step counter + posture monitor)
The combination of Wi-Fi + IMU + crypto chip makes this board suitable for anything from simple automations to secure cloud-based monitoring.
Arduino UNO WiFi REV2 ABX00021 Vs. Classic Arduino UNO
| Feature | Classic UNO | UNO WiFi REV2 (ABX00021) |
| Microcontroller | ATmega328P | ATmega4809 |
| Wi-Fi | No | Yes (u-blox NINA-W102) |
| IMU Sensor | No | Yes (LSM6DS3TR-C) |
| Security Chip | No | Yes (ECC608) |
| RAM | 2 KB | 6 KB |
| Flash Memory | 32 KB | 48 KB |
| PWM Pins | 6 | 5 |
| Best For | Basic prototyping | IoT, Security, Smart Devices |
How to Get Started with Arduino UNO WiFi REV2 ABX00021 (Step-by-Step)
- Step 1: Install the Arduino IDE
Download and install the latest Arduino IDE for your OS.
- Step 2: Add Board to the IDE
- Go to Tools > Board > Boards Manager
- Search for “Arduino megaAVR Boards”
- Install the package and select Arduino UNO WiFi Rev2
- Step 3: Connect the Board
Use a MicroUSB cable to connect the board. It should appear in Tools > Port.
- Step 4: Test with Example Sketch
- Try loading an example Wi-Fi sketch like:
- Step 5: Build Your Project
Start integrating sensors, use the IMU library, or connect your board to a cloud platform like ThingSpeak, Blynk, or IFTTT.
- Expert Tips to Maximize Performance
- Use External Antennas: For extended range, consider attaching an external antenna via the NINA-W102 connector.
- OTA Programming: Use Arduino IoT Cloud for wireless updates.
- Power Efficiently: Use sleep modes in the ATmega4809 for battery-powered setups.
- Secure Your Network: Use SSL/TLS for all communication; the ECC608 makes it easier.
- Update Firmware: Regularly check for firmware updates to the NINA module via Arduino’s WiFiNINA updater tool.
Conclusion: Elevate Your Prototyping with Arduino UNO WiFi REV2
If you’re serious about IoT development, STEM education, or building connected devices, the Arduino UNO WiFi REV2 ABX00021 is a smart and forward-looking choice.
Great for:
- Intermediate-to-advanced Arduino users
- IoT enthusiasts needing built-in Wi-Fi and motion detection
- Schools and universities teaching secure IoT systems
- Professionals needing a quick prototype for wireless solutions
The ABX00021 is more than just an Arduino board—it’s a complete IoT development platform. With Wi-Fi, advanced security, and sensing capabilities, it reduces development time while opening up endless possibilities for innovation.
Want to build the next smart home gadget, wearable, or robot?
The Arduino UNO WiFi Rev2 is your all-in-one solution to do it—faster, safer, and smarter.
