Leonardo R3 Development Board - ATmega32u4, USB HID
Leonardo R3 Development Board — ATmega32u4 with USB HID
The Leonardo R3 is a microcontroller board built around the ATmega32u4 chip, featuring native USB communication that lets it emulate a keyboard, mouse, or other HID device. It is fully compatible with the Arduino IDE and libraries, making it a go-to choice for custom input systems and automation projects. With 20 digital I/O pins, 7 PWM channels, and 12 analog inputs, it handles a broad spectrum of prototyping tasks.
Key Specifications
| Specification | Value |
|---|---|
| Microcontroller | ATmega32u4 |
| Operating Voltage | 5V |
| Digital I/O Pins | 20 (7 PWM) |
| Analog Input Pins | 12 |
| Flash Memory | 32 KB (4 KB bootloader) |
| Clock Speed | 16 MHz |
What You Can Build With This
- USB custom game controller or joystick
- Automated keyboard/mouse input emulator for testing
- MIDI controller or music instrument interface
- Home automation touch panel with HID feedback
Compatibility
This board is fully compatible with the Arduino IDE and can be programmed as a standard Arduino board. It works with 5V logic and pairs easily with sensors, displays, and motor drivers using common libraries. Due to its native USB support, it can directly communicate with a computer as an HID device without extra software.
Wiring Notes
Power the board via USB or 7-12V on the VIN pin. The built-in USB micro connector handles programming and HID communication. All I/O pins operate at 5V, so if using 3.3V sensors, external level shifting may be needed. For HID projects, ensure the board is correctly reset during upload to enter bootloader mode.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino IDE?
Yes, the Leonardo R3 is fully supported in the Arduino IDE. Select "Arduino Leonardo" from the board menu under Tools.
Can I use it as a keyboard/mouse?
Absolutely, the ATmega32u4 has native USB HID capability. Use the Keyboard and Mouse libraries in Arduino to send keystrokes or mouse movements.
Does it work with Windows 11?
Yes, the board is recognized as a Leonardo on Windows 11. Drivers install automatically when connected via USB.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items