--- product_id: 189072927 title: "KEYESTUDIO Leonardo R3 ATMEGA32U4-AU Microcontroller Development Board for Arduino Leonardo" brand: "keyestudio" price: "$2.59" currency: USD in_stock: false reviews_count: 13 url: https://www.desertcart.us/products/189072927-keyestudio-leonardo-r3-atmega32u4-au-microcontroller-development-board-for-arduino store_origin: US region: United States of America --- # 40mA max current per 5V I/O port 23 digital I/O & 7 PWM ports ATMEGA32U4 original chip KEYESTUDIO Leonardo R3 ATMEGA32U4-AU Microcontroller Development Board for Arduino Leonardo **Brand:** keyestudio **Price:** $2.59 **Availability:** ❌ Out of Stock ## Summary > 🚀 Power your innovation with the Leonardo R3 – where precision meets style! ## Quick Answers - **What is this?** KEYESTUDIO Leonardo R3 ATMEGA32U4-AU Microcontroller Development Board for Arduino Leonardo by keyestudio - **How much does it cost?** $2.59 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/189072927-keyestudio-leonardo-r3-atmega32u4-au-microcontroller-development-board-for-arduino) ## 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 - • **Robust I/O Port Arsenal:** Access 23 digital I/O ports, 7 PWM channels, and 12 analog inputs for versatile project possibilities. - • **Sleek & Functional Design:** Striking yellow-black aesthetic combined with a compact 6.85 x 5.3 cm footprint fits perfectly on any workspace. - • **Power-Optimized Performance:** Supports up to 40mA on 5V ports and 50mA on 3.3V ports, ensuring reliable power delivery for your components. - • **Certified Eco-Friendly Build:** FCC & CE certified with environmentally conscious manufacturing—tech that’s responsible and reliable. - • **Seamless Arduino IDE Integration:** Effortlessly program with full compatibility to Arduino Leonardo boards—no compilation errors when set up right. ## Overview The KEYESTUDIO Leonardo R3 is a compact, ATMEGA32U4-based microcontroller development board fully compatible with Arduino Leonardo. Featuring 23 digital I/O ports, 7 PWM outputs, and 12 analog inputs, it supports a 5V working voltage with robust current handling. Certified FCC and CE, it combines eco-friendly manufacturing with a distinctive yellow-black design, making it ideal for professional makers and developers seeking reliable, versatile prototyping hardware. ## Description 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. 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) 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 List The Leonardo R3 board is small and easy to operate. It has Atmega 32u4 micro controller and USB enabled. 1 x keyestudio Leonardo R3 Development Board 1 x Usb Cable Please note Select the Arduino Board When you Open the Arduino IDE, you’ll need to click the “Tools”, then select the Board that corresponds to your Arduino. NOTE Please note that after downloading the Arduino program, before driving the leonardo board. Please select the correct driver leonardo motherboard on the ARDUINO IDE , otherwise the board cannot be driven normally. Please see the picture show. Review: Great prototyping device at a great price - This bit of kit is an enabler for all those who either have low level microprocessor development back grounds but no access to the kit anymore or those that are brand new to the fun and games. It is a well made piece of kit that, as far as I can tell fully conforms. Good stuff! Review: Seems to be as good as the arduino - Just like the real thing and worked with the arduino IDE fine ## 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.KEYESTUDIO leonardo R3 is fully compatible with the official version, with the same circuit array - It is our newest open-source controller, which has cool yellow-black design and twenty-three digital I/O ports, seven PWM ports and twelve analog input ports - Maximum allowable current of 5V digital/analog port: 40 mA, and of 3.3V digital/analog port: 50 mA; Working voltage: 5V; Input voltage (recommended) : 7-12v - Has fcc and ce certification that they are made from environmentally friendly production technology and materials, made function,voltage, current testing before packaging - Main control chip is ATMEGA 32u4, adopting the United States ATMEL original. 【Tutorial download: 】https://fs.keyestudio.com/KS0248 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0786LJQ8K | | Best Sellers Rank | 159,186 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 1,573 in Motherboards | | Box Contents | Keybord, Mouse | | Brand | KEYESTUDIO | | Brand Name | KEYESTUDIO | | CPU Model | Intel Core i9 | | CPU model | Intel Core i9 | | CPU speed | 16 MHz | | Compatible Devices | Personal Computer, Laptop, Tablet | | Customer Reviews | 4.6 out of 5 stars 628 Reviews | | Item Dimensions L x W x H | 6.9L x 5.3W x 0.4H centimetres | | Item Weight | 0.13 Pounds | | Manufacturer | KEYESTUDIO | | Manufacturer Part Number | ks0248 | | Memory Storage Capacity | 32 KB | | Memory storage capacity | 32 KB | | Model Name | ATMEGA32U4-AU | | Model Number | KE-0011 | | Model name | ATMEGA32U4-AU | | Network Connectivity Technology | USB | | Operating System | Linux | | Processor Brand | Microchip Technology | | Processor Count | 1 | | Processor Speed | 16 MHz | | RAM Memory Installed | 5 MB | | RAM Memory Technology | SRAM | | RAM memory installed size | 5 MB | | UPC | 600346571761 606184533497 600346574199 | | Unit Count | 1.0 count | | Wireless Compability | Bluetooth | ## Product Details - **Brand:** KEYESTUDIO - **Model name:** ATMEGA32U4-AU - **RAM memory installed size:** 5 MB - **Memory storage capacity:** 32 KB - **CPU model:** Intel Core i9 ## Images ![KEYESTUDIO Leonardo R3 ATMEGA32U4-AU Microcontroller Development Board for Arduino Leonardo - Image 1](https://m.media-amazon.com/images/I/61w4INl9jaL.jpg) ![KEYESTUDIO Leonardo R3 ATMEGA32U4-AU Microcontroller Development Board for Arduino Leonardo - Image 2](https://m.media-amazon.com/images/I/61rc9Fii1AL.jpg) ![KEYESTUDIO Leonardo R3 ATMEGA32U4-AU Microcontroller Development Board for Arduino Leonardo - Image 3](https://m.media-amazon.com/images/I/71qAyefUQjL.jpg) ![KEYESTUDIO Leonardo R3 ATMEGA32U4-AU Microcontroller Development Board for Arduino Leonardo - Image 4](https://m.media-amazon.com/images/I/71TTOI+qaXL.jpg) ![KEYESTUDIO Leonardo R3 ATMEGA32U4-AU Microcontroller Development Board for Arduino Leonardo - Image 5](https://m.media-amazon.com/images/I/61kpouMDzBL.jpg) ## Questions & Answers **Q: How can I burn the Bootloader? Mine has stopped being recognised in windows** A: you have probably lost bootloader look on Internet to reset and restore the bootloader **Q: Does it works on Windows? Or only Linux?** A: Hi there, I use this with windows and it works completely fine. You just need to download the windows version of the IDE. :) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great prototyping device at a great price *by H***E on 14 December 2022* This bit of kit is an enabler for all those who either have low level microprocessor development back grounds but no access to the kit anymore or those that are brand new to the fun and games. It is a well made piece of kit that, as far as I can tell fully conforms. Good stuff! ### ⭐⭐⭐⭐⭐ Seems to be as good as the arduino *by K***S on 7 April 2024* Just like the real thing and worked with the arduino IDE fine ### ⭐⭐⭐⭐⭐ Nice product *by G***N on 27 December 2020* Works well and has compatibility with all the extras which assist with connectivity. Well made and included the cable to connect via USB. Nice board. Leonardo is catered for within the Boards offered by the Arduino when downloading sketches. ## 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.us/products/189072927-keyestudio-leonardo-r3-atmega32u4-au-microcontroller-development-board-for-arduino](https://www.desertcart.us/products/189072927-keyestudio-leonardo-r3-atmega32u4-au-microcontroller-development-board-for-arduino) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-06-24*