Official Arduino Leonardo R3 Development Board with Pre-Soldered Headers
Official Arduino Leonardo R3 Development Board with Pre-Soldered Headers
The Arduino Leonardo R3 is a microcontroller board based on the ATmega32u4 chip, featuring built-in USB communication that allows it to emulate a keyboard, mouse, or serial device. Its 20 digital I/O pins, 12 analog inputs, and 16 MHz clock speed make it ideal for interactive projects and rapid prototyping. The pre-soldered headers let you start building immediately without any soldering.
Key Specifications
| Specification | Value |
|---|---|
| Microcontroller | ATmega32u4 |
| Operating Voltage | 5V |
| Digital I/O Pins | 20 (7 PWM, 12 analog) |
| Flash Memory | 32 KB (4 KB used by bootloader) |
| SRAM | 2.5 KB |
| Clock Speed | 16 MHz |
What You Can Build With This
- Custom USB game controller for retro gaming emulators
- MIDI instrument interface for music production
- Automated keyboard shortcuts for productivity workflows
- Smart home sensor hub with serial-over-USB data logging
Compatibility
The Leonardo works seamlessly with the Arduino IDE on Windows, macOS, and Linux. It is electrically compatible with most Arduino shields designed for 5V operation and supports the same library ecosystem as the Uno. Common pairings include motor drivers, relay modules, and sensor shields that use the standard Arduino pinout.
Wiring Notes
All male header pins are pre-soldered, so you can directly insert the board into a breadboard or connect jumper wires. There is no need for external pull-up resistors on the I2C lines; the board includes internal pull-ups that can be enabled in software. The Micro USB port provides both power and programming.
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 Windows 11?
Yes, the Leonardo is fully compatible with Windows 11. Install the Arduino IDE and the necessary drivers will load automatically when you connect the board via USB.
How does the Leonardo differ from the Arduino Uno?
The Leonardo uses the ATmega32u4 chip, which has built-in USB communication, allowing it to emulate a keyboard or mouse. The Uno requires an external USB-to-serial chip and does not support native USB HID without extra software.
Can I power the board with a 9V battery?
Yes, the Leonardo can be powered via the Vin pin with 7-12V. A 9V battery works, but ensure the connector polarity matches the board: positive to Vin, ground to GND.
📦 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