Introducing ItsyBitsy 32u4 What's smaller than a Feather but larger than a Trinket? It's an ItsyBitsy! by lady ada published January 03, 2018, last edited May 05, 2025 posted in Microcontrollers Arduino Compatibles Development Boards Save New Favorite × Please sign in to include this guide in your list of favorites. You will be redirected back to this guide once you sign in, and can then save this guide as one of your favorites. Link Note Download Overview Pinouts Arduino IDE Setup Using with Arduino IDE Downloads Single page Feedback? Corrections? Text View Primary Products Adafruit ItsyBitsy 32u4 - 3V 8MHz $9.95 Add to Cart Adafruit ItsyBitsy 32u4 - 5V 16MHz $9.95 Add to Cart Featured Products view all Adafruit LiIon/LiPoly Backpack Add-On for Pro Trinket/ItsyBitsy $4.95 Add to Cart IC Socket - for 28-pin 0.6" Chips - Pack of 3 No Longer Stocked 39 Beginner Product guide Downloads Files EagleCAD files for both 3V and 5V 32u4 ItsyBitsy's Fritzing files for both types in the Adafruit Fritzing library PDF for ItsyBitsy 32u4 3V Board Diagram on GitHub PDF for ItsyBitsy 32u4 5V Board Diagram on GitHub SVG for ItsyBitsy 32u4 3V Board Diagram SVG for ItsyBitsy 32u4 5V Board Diagram Bootloaders Caterina_itsybitsy3V.hex Caterina_itsybitsy5V.hex ItsyBitsy 3V Schematic & Fabrication print ItsyBitsy 5V Schematic & Fabrication print Page last edited May 05, 2025 Text editor powered by tinymce. Using with Arduino IDE