KEYESTUDIO Leonardo R3 Microcontroller Development Board with USB Cable Kit

Product description KEYESTUDIO Leonardo R3 Board

KEYESTUDIO Leonardo R3 is an ATmega32u4 microcontroller board.

The Leonardo differs from other Arduino boards using separate USB-Serial chip in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor.

Power Supply:

The board has 20 digital input/output pins (of which 7 can be used as PWM outputs), 12 analog inputs, a 16MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button.

The keyestudio Leonardo can be powered via the micro USB connection, or via an external power supply jack (DC 7-12V) or even with female headers Vin /GND (DC 7-12V).

Memory Store:

The Atmega32u4 of KEYESTUDIO Leonardo R3 Board has 32KB of flash memory for storing code (of which 4 KB is used for the bootloader), 2.5KB of SRAM and 1KB of EEPROM (which can be read and written with the Eeprom library).

Board Model:

Neat little Leonardo r3 board works just like the original!

Another great Arduino alternative. It works fine and the quality is good. The yellow and black theme is unique.

Technical Specification:

• Microcontroller: Atmega32u4
• Operating Voltage：5V
• Input voltage (recommended): DC7-12v
• Digital I/O Pins: 20 (of which 7 provide PWM output)
• PWM Digital I/O Pins: 7
• Analog Input Pins: 12
• DC Current per I/O Pin: 40mA
• DC Current for 3.3V Pin: 50mA

• Flash Memory: 32KB (ATmega32u4) of which 4KB used by boot loader
• SRAM: 2.5 KB (ATmega32u4);
• EEPROM: 1 KB (ATmega32u4);
• Clock Speed: 16MHz
• LED_BUILTIN: D13

• Digital I/O pins: D0-D13 and A0-A5 (D18-D23); the ICSP pins can be used as digital pins.
• Analog Inputs: A0-A5, A6-A11, that is, D4 (A6)、D6 (A7)、D8 (A8)、D9 (A9)、D10 (A10) and D12 (A11)
• PWM pins: D3, D5, D6, D9, D10, D11 and D13.
• External Interrupts: D3(interrupt0);D2(interrupt1); D0 (interrupt2), D1(interrupt3), D7(interrupt4).
• Serial communication: D0 (RX) and D1 (TX)

Regarding how to use:

Select the Arduino Board

Open the Arduino IDE, you’ll need to click the “Tools”, then select the Board that corresponds to your Arduino.

If you don\'t choose the correct development board type, it will cause the compilation to fail to transfer.

So this is a place that needs special attention.

Add to Cart Add to Cart Customer Reviews 4.0 out of 5 stars 258 4.2 out of 5 stars 248 — 4.1 out of 5 stars 237 3.0 out of 5 stars 4 4.2 out of 5 stars 113 Price $63.00$63.00 — no data — no data $55.00$55.00 — no data — no data for Arduino ✓ ✓ ✓ ✓ ✓ ✓ Detailed tutorial ✓ ✓ ✓ ✓ ✓ no data

• [Beginner-Friendly Setup – No Frustration] - New to Arduino? Here\'s a pro tip: Open Arduino IDE, go to Tools > Board, and select \"Arduino Leonardo\" – that\'s it! Choose correctly and upload your code smoothly without compilation errors. Includes a USB cable for true plug-and-play convenience.
• [Official Wiki & Full Technical Support] - Backed by a dedicated official Wiki – your complete resource for detailed specs, pinout diagrams, driver setup, and sample codes. Whether you\'re a beginner or a pro, get the documentation you need to bring your projects to life faster and with confidence.
• [Native HID – Keyboard/Mouse Emulation] - Powered by the ATmega32U4 microcontroller with built-in USB communication – no extra chip needed! Emulate a keyboard or mouse directly for custom game controllers, automation tools, programmable shortcut panels, and more. Unleash your creativity with true plug-and-play HID functionality.
• [FCC/CE Certified] - Engineered with eco-friendly materials and rigorously tested – every single board undergoes full functional, voltage, and current inspections before packaging. FCC and CE certified to ensure safety, reliability, and peace of mind for your critical projects.
• [Rich I/O for Endless Possibilities] - Features 20 digital I/O pins (7 PWM), 12 analog inputs, a 16 MHz crystal oscillator, and supports UART, I2C, and SPI. Easily connect sensors, motors, displays, and countless modules – the perfect brain for robotics, interactive art, DIY electronics, and rapid prototyping.