The Leonardo R3 Development Board is a powerful and versatile microcontroller board based on the ATmega32u4, designed for makers, students, and professionals. Unlike the Uno or Nano, the Leonardo has built-in USB communication, which allows it to directly emulate a mouse, keyboard, joystick, or other HID devices—making it perfect for advanced projects.
Fully compatible with the Arduino IDE and libraries, the Leonardo R3 is an excellent choice for learning, prototyping, and developing interactive electronics projects.
Key Features:
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Microcontroller: ATmega32u4
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Operating Voltage: 5V
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Input Voltage (recommended): 7–12V
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Digital I/O Pins: 20 (7 PWM outputs)
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Analog Input Pins: 12
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Clock Speed: 16 MHz
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Flash Memory: 32 KB (4 KB used by bootloader)
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SRAM: 2.5 KB
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EEPROM: 1 KB
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USB Connection: Micro-USB (built-in USB support, no extra chip needed)
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Resettable Polyfuse for overcurrent protection
Advantages of Leonardo R3:
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Built-in USB communication (no separate USB-to-serial chip required)
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Can function as a keyboard, mouse, or joystick for HID projects
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More I/O pins than Arduino Uno
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Fully Arduino IDE compatible
Applications:
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DIY electronics and robotics
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Human Interface Device (HID) projects (mouse/keyboard emulation)
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IoT and sensor-based systems
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Automation and control projects
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Educational kits and prototyping