--- product_id: 60379488 title: "KEYESTUDIO Leonardo R3 Microcontroller Development Board with USB Cable Kit for Arduino Project" brand: "keyestudio" price: "4211 som" currency: KGS in_stock: true reviews_count: 13 category: "Keyestudio" url: https://www.desertcart.kg/products/60379488-keyestudio-leonardo-r3-microcontroller-development-board-with-usb-cable-kit store_origin: KG region: Kyrgyzstan --- # 16 MHz crystal oscillator speed 20+ digital I/O pins (7 PWM + SDA/SCL) Built-in USB comms, no extra chip KEYESTUDIO Leonardo R3 Microcontroller Development Board with USB Cable Kit for Arduino Project **Brand:** keyestudio **Price:** 4211 som **Availability:** ✅ In Stock ## Summary > 🚀 Elevate your Arduino game with native USB power and pro-level versatility! ## Quick Answers - **What is this?** KEYESTUDIO Leonardo R3 Microcontroller Development Board with USB Cable Kit for Arduino Project by keyestudio - **How much does it cost?** 4211 som with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/60379488-keyestudio-leonardo-r3-microcontroller-development-board-with-usb-cable-kit) ## Best For - keyestudio enthusiasts ## Why This Product - Trusted keyestudio brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Plug & Play Ready:** Pre-tested with voltage/current checks and FCC/CE certified eco-friendly build—start your project worry-free. - • **Robust Pin Arsenal:** 20 digital I/O pins plus 12 analog inputs and bonus SDA/SCL lines give you unmatched prototyping flexibility. - • **Pro-Grade Stability:** 16 MHz clock speed and reliable AMS1117-5V regulator ensure smooth, consistent performance under load. - • **Sleek & Sturdy Design:** Eye-catching black & yellow aesthetic with durable micro USB connector and clear silk-screening for professional setups. - • **Seamless USB Integration:** ATmega32u4 MCU with native USB means your board acts as a keyboard or mouse—no clunky adapters needed. ## Overview The KEYESTUDIO Leonardo R3 is a compact, 16 MHz microcontroller board based on the ATmega32u4, featuring native USB communication that enables it to emulate mouse and keyboard functions. It offers 20 digital I/O pins (expandable to 22), 12 analog inputs, and robust power regulation. Certified for quality and eco-friendly production, it comes pre-tested and includes a sturdy micro USB cable, making it an ideal choice for professional-grade prototyping and development. ## Description desertcart.com: KEYESTUDIO Leonardo R3 Microcontroller Development Board with USB Cable Kit for Arduino Project : Electronics Review: I did extensive testing and found no defects - Overview: I am pleased w/ this purchase. I use it as an "Uno substitute": its useful for prototyping, but I'm unlikely to use as the final MCU in a project. It is 50x70mm, matching the board size of a Genuino Uno. Details and testing: Packaging: Arrived in a Keyestudio display (cardboard) box, inside a 2nd crush-resistant cardboard box. The package includes a serial cable. Appearance: The board has "spiffy" yellow labelling and yellow headers on a black background. Components & electrical testing: The microprocessor, in the 44-pin TQFP form factor, is labelled "Atmel mega32U4, -MU, 2335 PU". On-board voltage regulator is the AMS1117-5v. With a 9-v battery plugged to the barrel jack (or the Vin pin), Vout is 5.04v. Functional testing: (a) Program upload: With a 9-v battery attached, the on-board LED flashed at 1 Hz, implying the "blink sketch" is running and the Bootloader is present. No need to install other software (e.g., QMK firmware). I opened the Arduino IDE, plugged in the serial cable, then checked Tools|Port. The IDE recognized the board as "COM# (Arduino Leonardo)". (b) UART-USB-Serial interface: Unlike some 32U4 boards, this MCU has on-board UART IC, making serial programming easy. I selected Tools|Board|Arduino AVR boards and chose "Leonardo". I created & uploaded a "Hello World" sketch and opened a serial window => success. (c) Analog pins/ADC: The ADC and all analog pins were functional. I created ~2v at the mid-pt of a voltage divider and measured the value returned from the A0 pin. The value was in the expected range (422, corresponding to 2.2v, w/ similar values fr pins A1-A5, as well as, a Genuino Uno). d) PWM pins: I successfully made LEDs attached to PWM pins (3, 5, 6, 9, 10, & 11) fade. e) Memory: successful access to flash [32kb (28.7kb+bootloader)], SRAM (2.5kb) and EEPROM (1kb), confirming the expected values. Review: All pins working on arrival as well as USB HID functionality, great board. - The description says this Leo has 20 digital input/output pins, but you can actually squeeze that number up to 22 by using SDA and SCL. Perfect for my needs! I wrote up a quick sketch when I got the board and all 22 of those pins fed a nice healthy HIGH signal when told to. Keyboard emulation also worked flawlessly. I've had problems in the past with micro USB connectors on Arduinos, but this one is very sturdy and plugs in and out easily and securely with the provided cable. Also, the silk screening on the board is very nice. I really like the color of this specific Leonardo. Great product! ## Features - Please NOTE: 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. - The keyestudio Leonardo is a microcontroller board based on the ATmega32u4，It has 20 digital input/output pins (of which 7 can be used as PWM outputs), 12 analog inputs, a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button. - The Leonardo differs from other boards using separate USB-Serial chip in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. - This allows the Leonardo to appear to a connected computer as a mouse and keyboard. - Has fcc and ce certification that they are made from environmentally friendly production technology and materials, made function,voltage, current testing before packaging ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0786LJQ8K | | Best Sellers Rank | #563 in Single Board Computers (Computers & Accessories) | | Brand | KEYESTUDIO | | Built-In Media | NO | | CPU Model | 5X86 | | Compatible Devices | Computers (Windows, Mac OS X, Linux) | | Connectivity Technology | USB | | Customer Reviews | 4.6 4.6 out of 5 stars (633) | | Item Dimensions L x W x H | 2.7"L x 2.09"W x 0.17"H | | Item Weight | 2.08 ounces | | Manufacturer | keyes | | Memory Storage Capacity | 32 KB | | Mfr Part Number | ks0248 | | Model Name | KEYESTUDIO Leonardo R3 | | Model Number | KE-0011 | | Operating System | Windows 10 | | Processor Count | 1 | | Processor Speed | 16 MHz | | RAM Memory Installed | 5 MB | | RAM Memory Technology | SRAM | | UPC | 600346571761 606184533497 600346574199 | | Wireless Compability | Bluetooth | ## Product Details - **Brand:** KEYESTUDIO - **CPU Model:** 5X86 - **Memory Storage Capacity:** 32 KB - **Model Name:** KEYESTUDIO Leonardo R3 - **Ram Memory Installed Size:** 5 MB ## Images ![KEYESTUDIO Leonardo R3 Microcontroller Development Board with USB Cable Kit for Arduino Project - Image 1](https://m.media-amazon.com/images/I/61w4INl9jaL.jpg) ![KEYESTUDIO Leonardo R3 Microcontroller Development Board with USB Cable Kit for Arduino Project - Image 2](https://m.media-amazon.com/images/I/61rc9Fii1AL.jpg) ![KEYESTUDIO Leonardo R3 Microcontroller Development Board with USB Cable Kit for Arduino Project - Image 3](https://m.media-amazon.com/images/I/71qAyefUQjL.jpg) ![KEYESTUDIO Leonardo R3 Microcontroller Development Board with USB Cable Kit for Arduino Project - Image 4](https://m.media-amazon.com/images/I/71TTOI+qaXL.jpg) ![KEYESTUDIO Leonardo R3 Microcontroller Development Board with USB Cable Kit for Arduino Project - Image 5](https://m.media-amazon.com/images/I/61kpouMDzBL.jpg) ## Questions & Answers **Q: is this leonardo HID compatible?** A: Yes **Q: Is this the same as a normal leonardo, or does the "development" in the name imply some other functionality?** A: I was looking for an UNO R3 (2016!) for a Grove sensor project. It is a regular, normal UNO board. I used the Arduino IDE to program Seeed Studio's Grove watering, temperature sensors. I also purchased a similar board "MakerBest Hight Quality Compatible Arduino UNO R3 ATmega328P Development Kits " for Elenco's Snapno kit. Both work fine and both for developing projects using UNO boards. Hope this helps **Q: will this device run micropython?** A: sorry ,it can't **Q: Is there a program to be installed?** A: It's Ardunio-based, so you'll have to write the code and load it in. There are a lot of tutorials out on the web and pre-existing code that make it easy (or easier than starting from scratch). ## Customer Reviews ### ⭐⭐⭐⭐⭐ I did extensive testing and found no defects *by M***E on July 15, 2024* Overview: I am pleased w/ this purchase. I use it as an "Uno substitute": its useful for prototyping, but I'm unlikely to use as the final MCU in a project. It is 50x70mm, matching the board size of a Genuino Uno. Details and testing: Packaging: Arrived in a Keyestudio display (cardboard) box, inside a 2nd crush-resistant cardboard box. The package includes a serial cable. Appearance: The board has "spiffy" yellow labelling and yellow headers on a black background. Components & electrical testing: The microprocessor, in the 44-pin TQFP form factor, is labelled "Atmel mega32U4, -MU, 2335 PU". On-board voltage regulator is the AMS1117-5v. With a 9-v battery plugged to the barrel jack (or the Vin pin), Vout is 5.04v. Functional testing: (a) Program upload: With a 9-v battery attached, the on-board LED flashed at 1 Hz, implying the "blink sketch" is running and the Bootloader is present. No need to install other software (e.g., QMK firmware). I opened the Arduino IDE, plugged in the serial cable, then checked Tools|Port. The IDE recognized the board as "COM# (Arduino Leonardo)". (b) UART-USB-Serial interface: Unlike some 32U4 boards, this MCU has on-board UART IC, making serial programming easy. I selected Tools|Board|Arduino AVR boards and chose "Leonardo". I created & uploaded a "Hello World" sketch and opened a serial window => success. (c) Analog pins/ADC: The ADC and all analog pins were functional. I created ~2v at the mid-pt of a voltage divider and measured the value returned from the A0 pin. The value was in the expected range (422, corresponding to 2.2v, w/ similar values fr pins A1-A5, as well as, a Genuino Uno). d) PWM pins: I successfully made LEDs attached to PWM pins (3, 5, 6, 9, 10, & 11) fade. e) Memory: successful access to flash [32kb (28.7kb+bootloader)], SRAM (2.5kb) and EEPROM (1kb), confirming the expected values. ### ⭐⭐⭐⭐⭐ All pins working on arrival as well as USB HID functionality, great board. *by A***R on August 8, 2020* The description says this Leo has 20 digital input/output pins, but you can actually squeeze that number up to 22 by using SDA and SCL. Perfect for my needs! I wrote up a quick sketch when I got the board and all 22 of those pins fed a nice healthy HIGH signal when told to. Keyboard emulation also worked flawlessly. I've had problems in the past with micro USB connectors on Arduinos, but this one is very sturdy and plugs in and out easily and securely with the provided cable. Also, the silk screening on the board is very nice. I really like the color of this specific Leonardo. Great product! ### ⭐⭐⭐⭐⭐ Great little unit *by S***S on December 27, 2024* Works perfect, been learning stuff on Uno and wanted try making a sim racing button box so needed something with HID capability. Using this with Simhub made that very easy. This board is perfect for developing HID devices. ## Frequently Bought Together - KEYESTUDIO Leonardo R3 Microcontroller Development Board with USB Cable Kit for Arduino Project - EDGELEC 120pcs Breadboard Jumper Wires 10cm 15cm 20cm 30cm 40cm 50 cm 100cm Wire Length Optional Dupont Cable Assorted Kit Male to Female Male to Male Female to Female Multicolored Ribbon Cables - WWZMDiB Mini USB 2.0 to TTL Converter Serial Adapter 3.3V 5V Compatible with CP2102 Chip UART Programming --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.kg/products/60379488-keyestudio-leonardo-r3-microcontroller-development-board-with-usb-cable-kit](https://www.desertcart.kg/products/60379488-keyestudio-leonardo-r3-microcontroller-development-board-with-usb-cable-kit) --- *Product available on Desertcart Kyrgyzstan* *Store origin: KG* *Last updated: 2026-04-22*