The LilyPad Arduino USB is a sewable microcontroller board built around the ATmega32U4 with native USB support — just plug in a micro-USB cable to program, no external FTDI adapter needed. Officially supported in the Arduino IDE, it runs at 3.3V and features a JST connector for a rechargeable LiPo battery with onboard charging.

Designed for wearable e-textile projects, the LilyPad features large sew-tab pads for stitching into clothing with conductive thread. The thin 0.8 mm PCB and 50 mm circular form factor keep things compact and comfortable. An onboard power switch lets you turn off your project when not in use.

Key Features

• ATmega32U4 – Built-in USB; program directly via micro-USB cable
• 3.3V Operation – Safe for wearable and e-textile projects
• Onboard LiPo Charging – JST connector with built-in battery charger
• Power Switch – Turn your project on and off easily
• Sewable Pads – Large pads designed for conductive thread
• Thin PCB – 0.8 mm thick, 50 mm diameter for wearable comfort
• Arduino IDE Support – Officially supported from version 1.0.2+
• Washable – Designed to withstand gentle washing

Ideal For

• Wearable electronics and e-textile projects
• Interactive clothing and costumes
• Sewable LED and sensor projects
• Learning Arduino with wearable tech

Specifications

• Microcontroller: ATmega32U4
• Operating Voltage: 3.3V
• Diameter: 50 mm
• PCB Thickness: 0.8 mm

Package Contents

• 1× LilyPad Arduino USB Board

Resources

• Arduino Quickstart Guide
• Schematic (PDF)
• ATmega32U4 Datasheet (PDF)
• GitHub – Design Files & Examples