Description
The Arduino Leonardo uses the ATmega32u4 microcontroller, which integrates USB communication directly on the chip. This allows the board to emulate a keyboard, mouse, or game controller in addition to standard microcontroller functions. With 20 digital I/O pins, 7 PWM outputs, and 12 analog inputs, it is well-suited for DIY electronics, IoT devices, robotics, interactive installations, and human-computer interface projects. It is fully compatible with the Arduino IDE and supports a wide range of shields and sensors.
Key Features
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ATmega32u4 microcontroller with built-in USB
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20 digital I/O pins (7 PWM outputs)
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12 analog input pins
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USB communication: emulates keyboard, mouse, or HID devices
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Onboard micro-USB for programming and power
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Operating voltage: 5V
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Compatible with Arduino IDE
Variants
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Standard Arduino Leonardo
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Arduino Leonardo with headers pre-soldered
Specifications
| Feature | Details |
|---|---|
| Microcontroller | ATmega32u4 |
| Operating Voltage | 5V |
| Input Voltage (recommended) | 7–12V |
| Digital I/O Pins | 20 (7 PWM outputs) |
| Analog Input Pins | 12 |
| Flash Memory | 32 KB (4 KB used by bootloader) |
| SRAM | 2.5 KB |
| EEPROM | 1 KB |
| Clock Speed | 16 MHz |
| Dimensions | 68.6 × 53.4 × 15 mm |
Applications
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DIY electronics and interactive projects
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Emulating USB devices like keyboard and mouse
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Robotics and automation systems
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IoT devices and embedded systems
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Sensor interfacing and data acquisition
Compatible Boards / Circuits
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Arduino shields compatible with Leonardo
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Works with Arduino IDE and USB libraries
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Can interface with sensors, modules, and displays
Reviews
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