The DFRduino Nano USB Microcontroller V3.1 (ATmega328) is a compact, fully breadboard-compatible version of the classic Arduino Nano . It integrates a USB interface and features the same ATmega328 chip, offering all the functionality of the Arduino Diecimila in a smaller, more convenient form factor.
Designed for both beginners and advanced developers, this board automatically switches between USB and external power, supports serial communication and programming via a mini-B USB connection, and includes helpful status LEDs for TX, RX, and Power.
Whether you're building quick prototypes or embedding microcontrollers into space-constrained projects, the DFRduino Nano is the perfect choice.
Key Features
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Auto-reset function for hassle-free program uploading
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Blue LED indicates power status
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TX (green), RX (red), and user (orange) LEDs
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+5V to AREF jumper support
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Automatic switching between USB and external power
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Mini-B USB port for programming and monitoring
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ICSP header for low-level programming
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Compact DIP design – breadboard friendly (0.1” spacing)
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Manual reset button included
Technical Specifications
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Microcontroller: Atmel ATmega328-20AU
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Operating Voltage: 5V (logic level)
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Input Voltage (recommended): 7–12V
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Digital I/O Pins: 14 (of which 6 provide PWM output)
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Analog Input Pins: 8
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DC Current per I/O Pin: 40 mA
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Flash Memory: 32 KB (2 KB used by bootloader)
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SRAM: 2 KB
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EEPROM: 1 KB
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Clock Speed: 16 MHz
Compatibility
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Fully compatible with Arduino IDE and most Arduino Nano shields
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Works with Windows, Mac, and Linux systems
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Ideal for robotics, wearables, and embedded systems