Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Development, Learning, Evaluation & Industrial Control Boards |
| Origin | - |
| Microcontroller | ATmega32U4 |
| Operating Voltage | 5V |
| 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 |
| USB Interface | Native USB (CDC/ HID) |
| Included Accessories | Micro-USB Data Cable |
Anonymous
Mar 21, 2026
Rating: 5/5
Perfect for MIDI projects
The native USB support on the ATmega32U4 makes this board incredible for creating custom keyboards and MIDI controllers. No need for external converters. Works flawlessly with the Arduino IDE.
Anonymous
Mar 18, 2026
Rating: 4/5
Good starter board
Slightly more expensive than the Uno, but the extra analog pins and USB capabilities are worth it. Documentation online is plentiful which helped me get started quickly.
Anonymous
Mar 18, 2026
Rating: 5/5
Best value for students
We bought ten of these for our university lab. They are durable, easy to program, and the included cable is a nice touch. Highly recommended for learning embedded systems.
Anonymous
Mar 14, 2026
Rating: 5/5
Reliable and compact
Used this for a custom drone flight controller prototype. The form factor fits well in tight spaces, and the voltage regulation is stable even under load.
Anonymous
Mar 09, 2026
Rating: 5/5
Seamless HID emulation
If you need your project to act as a mouse or keyboard, this is the only board you need. The library support is extensive and the compilation speed is fast.
Anonymous
Mar 06, 2026
Rating: 4/5
Great board, minor driver hiccup
Excellent build quality and pin layout. I had a small issue installing the drivers on Windows 10 initially, but once resolved, it has been rock solid for my robotics sensor array.
Q: Can I power this board via the VIN pin with 9V?
A: Yes, the onboard voltage regulator supports input voltages between 7V and 12V via the VIN pin or the DC power jack. 9V is ideal.
Q: Is there a difference between this and the Arduino Uno?
A: Yes, the main difference is the microcontroller. The Leonardo uses the ATmega32U4 with built-in USB, allowing it to emulate USB devices like keyboards, whereas the Uno uses the ATmega328P with a separate USB-to-Serial chip.
Q: How many PWM pins are available on this board?
A: The Leonardo R3 features 7 hardware PWM pins, which are digital pins 3, 5, 6, 9, 10, 11, and 13.
Q: Is this board compatible with the standard Arduino IDE?
A: Yes, this Leonardo R3 board is fully compatible with the Arduino IDE. You simply need to select 'Arduino Leonardo' from the board manager menu.
Q: Does the included cable support data transfer or just charging?
A: The included Micro-USB cable supports both data transfer and power. You can use it to upload code and communicate with the serial monitor immediately.
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