--- product_id: 39355585 title: "Beetle-A Small Microcontroller for Arduino Leonardo with USB HID for IoT & Wearable Projects (20mm×22mm, ATmega32u4, 3V Battery Support)" brand: "dfrobot" price: "£9.38" currency: GBP in_stock: true reviews_count: 13 category: "Dfrobot" url: https://www.desertcart.co.uk/products/39355585-beetle-a-small-microcontroller-for-arduino-leonardo-with-usb-hid store_origin: GB region: United Kingdom --- # 20mm×22mm ultra-compact size 3V coin battery low-power support Micro USB plug-and-play programming Beetle-A Small Microcontroller for Arduino Leonardo with USB HID for IoT & Wearable Projects (20mm×22mm, ATmega32u4, 3V Battery Support) **Brand:** dfrobot **Price:** £9.38 **Availability:** ✅ In Stock ## Summary > ⚡ Tiny Tech, Massive Impact: Power Your Wearables with Beetle-A! ## Quick Answers - **What is this?** Beetle-A Small Microcontroller for Arduino Leonardo with USB HID for IoT & Wearable Projects (20mm×22mm, ATmega32u4, 3V Battery Support) by dfrobot - **How much does it cost?** £9.38 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/39355585-beetle-a-small-microcontroller-for-arduino-leonardo-with-usb-hid) ## Best For - dfrobot enthusiasts ## Why This Product - Trusted dfrobot brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **No-Solder Sewable Pads:** V-shaped gold-plated pads enable direct conductive thread stitching—perfect for rapid prototyping and textile integration. - • **Thumb-Sized Powerhouse:** Ultra-compact 20mm×22mm design fits seamlessly into wearables and embedded projects. - • **Versatile I/O Expansion:** 10 digital pins plus 5 analog inputs with SPI/I2C support for scalable IoT and wearable applications. - • **Optimized for Long-Term Use:** Low-power 3V coin battery support ensures your projects run longer without bulky power sources. - • **Plug & Play with Arduino IDE:** Program and debug effortlessly via Micro USB, recognized as Arduino Leonardo for instant compatibility. ## Overview The Beetle-A is a compact 20mm×22mm microcontroller based on the ATmega32u4 chip, designed for seamless integration into IoT and wearable projects. Featuring no-solder, sewable gold-plated pads and plug-and-play compatibility with the Arduino IDE via Micro USB, it supports 10 digital and 5 analog inputs plus SPI/I2C expansion. Its low-power 3V coin battery support makes it ideal for long-term embedded applications, delivering professional-grade performance in a thumb-sized package. ## Description desertcart.com: Beetle-A Small Microcontroller for Arduino Leonardo with USB HID for IoT & Wearable Projects (20mm×22mm, ATmega32u4, 3V Battery Support) : Electronics Review: Works a treat, displays to Arduino IDE as Leonardo - Made my smallest K3NG, using the Beetle as its heart. I only had to change which pins were input/output and nothing else in the code for the upload to take and work first shot. It doesn't have as much memory space as a full Arduino Nano, but the SDA and SCL pins are better marked, as are the VCC and GND pads. The pads are big, and easy to solder, overall even better than the old Digispark boards. Review: Perfect for my project - It's tiny, it's inexpensive, and it works with the Sketch I made with an actual Leonardo. I keep it stored in a case meant for earplugs when not in use. Arduino IDE sees it as a Leonardo, everything works as a Leonardo. Splendid ## Features - Ultra-Compact Design: 20mm×22mm thumb-sized design is ideal for wearables and embedded systems, featuring wide-spaced pads for seamless conductive sewing and textile integration. - No-Solder, Sewable Design​​ – ​​V-shaped gold-plated pads​​ let users twist wires or stitch directly onto fabric with conductive thread. Ideal for beginners, classrooms, and rapid prototyping—no soldering iron needed. - Plug-and-Play with Arduino IDE​​ – Program via Micro USB. Leverage Leonardo’s USB-HID to create keyboards, mice, or game controllers. Directly download and debug programs via Micro USB interface, no need for programmer - Low-Power & Expandable: 10 digital pins + 5 analog inputs with 3V coin battery support | Optimized for long-term wearable use, compatible with SPI/I2C expansion via minimal wiring ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01B0IQFU4 | | Best Sellers Rank | #991 in Single Board Computers (Computers & Accessories) | | Date First Available | December 17, 2014 | | Is Discontinued By Manufacturer | No | | Item Weight | 0.32 ounces | | Item model number | DFR0282 | | Manufacturer | DFRobot | ## Product Details - **Brand:** DFROBOT - **CPU Speed:** 16 MHz - **Memory Storage Capacity:** 32 KB - **Model Name:** Beetle - **Ram Memory Installed Size:** 1 GB ## Images ![Beetle-A Small Microcontroller for Arduino Leonardo with USB HID for IoT & Wearable Projects (20mm×22mm, ATmega32u4, 3V Battery Support) - Image 1](https://m.media-amazon.com/images/I/51zDX1Rl0JL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works a treat, displays to Arduino IDE as Leonardo *by J***Y on June 26, 2024* Made my smallest K3NG, using the Beetle as its heart. I only had to change which pins were input/output and nothing else in the code for the upload to take and work first shot. It doesn't have as much memory space as a full Arduino Nano, but the SDA and SCL pins are better marked, as are the VCC and GND pads. The pads are big, and easy to solder, overall even better than the old Digispark boards. ### ⭐⭐⭐⭐⭐ Perfect for my project *by K***A on August 13, 2024* It's tiny, it's inexpensive, and it works with the Sketch I made with an actual Leonardo. I keep it stored in a case meant for earplugs when not in use. Arduino IDE sees it as a Leonardo, everything works as a Leonardo. Splendid ### ⭐⭐⭐⭐ High quality, but haven't used it. *by M***Y on November 23, 2025* Bought, but not used yet. Looks to be good quality though. Gold plated contacts all over, so pretty good quality. ## Frequently Bought Together - Beetle - The Smallest Microcontroller - Seeed Studio XIAO ESP32C3 - Tiny MCU Board with Wi-Fi and BLE for IoT Controlling Scenarios. Microcontroller with Battery Charge, Power Efficient, and Rich Interface for Tiny Machine Learning. … - Seeed Studio XIAO RP2040 Microcontroller, with Dual-Core ARM Cortex M0+ Processor, Supports Arduino, MicroPython and CircuitPython with Rich Interfaces. --- ## 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.co.uk/products/39355585-beetle-a-small-microcontroller-for-arduino-leonardo-with-usb-hid](https://www.desertcart.co.uk/products/39355585-beetle-a-small-microcontroller-for-arduino-leonardo-with-usb-hid) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-18*