Arduino UNO R3 compatible board built around the classic ATmega328P @ 16 MHz. It combines 14 digital I/O (6 PWM), 6 analog inputs, solid 5 V logic, and full compatibility with the huge ecosystem of Arduino shields, sensors, and displays. Ideal as a first microcontroller board or a dependable workhorse for prototyping and embedded projects.

Why Makers Choose This UNO R3-Compatible Board

• Beginner-friendly & well-documented: Works with the standard Arduino IDE, examples, and libraries out of the box.
• 5 V shield compatibility: R3 footprint and pinout mean instant add-ons for motor control, Ethernet, LCDs, relays, and more.
• Flexible power options: Program via USB-B; power from USB or DC jack (recommended 7–12 V) for standalone projects.
• Reliable platform: Stable hardware design that’s great for repeated use in labs, classrooms, or project benches.

What You Can Build

• STEM projects: traffic lights, temperature loggers, distance meters, datalogging with RTC + microSD
• Home & hobby: smart plant watering (relay + soil sensor), door alarms (PIR), IR remote controllers
• Robotics: line followers and 2WD cars with motor shields and IMU/ToF sensors
• Wearables & interaction: LED wearables, sound-reactive lights, simple MIDI controllers
• IoT & automation: connect to WiFi modules, log data, and control relays or actuators

Starter Bundles (Quick Picks)

• UNO Learning Kit: UNO R3-compatible board + USB-B cable + breadboard & jumpers + basic sensors + 0.96″ OLED
• Sensor Lab: UNO R3-compatible board + BME280 + HC-SR04 + relay + data logging shield
• Robot Starter: UNO R3-compatible board + 2WD chassis + L293D/TB6612 shield + battery/PSU

Recommended Add-Ons

• USB-B cable for programming and power
• Sensor packs (DHT22, PIR, HC-SR04, IMU, light)
• Displays (1602 LCD, OLED, TFT)
• Arduino shields (motor, relay, Ethernet, proto)
• 5 V/9 V/12 V power supplies & 5.5×2.1 mm barrel adapters
• Tools (soldering, tweezers) & multimeter for troubleshooting
• Cases & mounting (clear acrylic, ABS, DIN-rail)

Technical Specifications

Pinout & Power Tips

• SPI via ICSP: Use the 6-pin ICSP header for reliable SPI (also handy when using shields).
• Level safety: UNO-style boards are 5 V. If a module is 3.3 V-only, add a logic level converter.
• Power sources: For portable builds, power via DC jack or VIN (7–12 V recommended). For bench work, USB is fine.
• Grounding: Always share GND between the board, sensors, and external modules for stable readings.

Learning Path (Beginner → Intermediate)

1. Blink & Inputs: LED blink, button debounce, tone/buzzer
2. Sensing: DHT22 temp/humidity, HC-SR04 distance, LDR light
3. Outputs: relays, servos, LCD/OLED
4. Data logging: microSD + RTC shield, graphs & alerts
5. Motion & robots: motor shield + 2WD/4WD chassis + IMU

What’s in the Box

• 1 × Arduino UNO R3-compatible board (ATmega328P)

Compatibility & Notes

• Shields: R3 footprint with full 5 V logic for maximum shield compatibility.
• Drivers: Some compatible boards use CH340/CP2102 USB-to-serial chips and may require a driver install on certain systems.
• UNO R3 vs other boards: Newer boards may offer more performance or USB-C, but the UNO R3 ecosystem remains the most widely supported and documented.