---
product_id: 189072927
title: "KEYESTUDIO Leonardo R3"
brand: "keyestudio"
price: "€ 34.00"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.de/products/189072927-keyestudio-leonardo-r3
store_origin: DE
region: Germany
---

# 40mA max current per 5V I/O port 23 digital I/O & 7 PWM ports ATMEGA32U4 original chip KEYESTUDIO Leonardo R3

**Brand:** keyestudio
**Price:** € 34.00
**Availability:** ✅ In Stock

## Summary

> 🚀 Power your innovation with the Leonardo R3 – where precision meets style!

## Quick Answers

- **What is this?** KEYESTUDIO Leonardo R3 by keyestudio
- **How much does it cost?** € 34.00 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/189072927-keyestudio-leonardo-r3)

## 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

Full description not available

## 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 |
|---------------|-------|
| Manufacturer | KEYESTUDIO |
| Language | English |
| Item model number | KE-0011 |
| Product Dimensions | 6.85 x 5.3 x 0.42 cm; 58.97 g |
| ASIN | B0786LJQ8K |

## 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 - Image 1](https://m.media-amazon.com/images/I/61w4INl9jaL.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

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**Shop now:** [https://www.desertcart.de/products/189072927-keyestudio-leonardo-r3](https://www.desertcart.de/products/189072927-keyestudio-leonardo-r3)

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*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-05-19*