Little Bird
E-Textiles LilyPad Compatible USB - ATmega32U4 Board
A LilyPad-compatible microcontroller board based on the ATmega32U4, designed for e-textile and wearable electronics projects. The built-in USB communication ...
A LilyPad-compatible microcontroller board based on the ATmega32U4, designed for e-textile and wearable electronics projects. The built-in USB communication allows the board to appear as a mouse, keyboard, or virtual serial port when connected to a computer — no separate USB-to-serial adapter needed.
Features a Micro USB connector for programming and power, plus a JST connector for a 3.7V LiPo battery. The sewable form factor and 3.3V operation make it ideal for fabric-based circuits.
Key Features
- ATmega32U4 – Built-in USB with HID (keyboard/mouse) support
- 3.3V / 8 MHz – Safe for e-textile applications
- 9 Digital I/O Pins – 4 PWM outputs, 4 analogue inputs
- Micro USB – Direct programming and power
- LiPo Battery Connector – JST connector for 3.7V batteries
- Sewable Design – LilyPad-compatible form factor
Specifications
- Microcontroller – ATmega32U4
- Operating Voltage – 3.3V
- Input Voltage – 3.8–5V
- Digital I/O – 9 pins (4 PWM)
- Analogue Inputs – 4
- DC Current per Pin – 40 mA
- Flash Memory – 32 KB (4 KB bootloader)
- SRAM – 2.5 KB
- EEPROM – 1 KB
- Clock Speed – 8 MHz
Package Contents
- 1× LilyPad Compatible USB Board (ATmega32U4)
Jargon buster
Plain-language definitions for the technical terms used above.
- Bootloader
- Small starter software on a microcontroller that lets new code be uploaded before the main program runs. Knowing how to enter bootloader mode matters when you need to program the board or recover it after a faulty sketch.
- EEPROM
- A type of non-volatile memory that keeps stored data even when power is turned off. In a sensor module, it can be used to store settings or calibration data so they do not need to be re-entered every time.
- Flash memory
- Non-volatile memory that keeps stored data even when power is removed. In this sensor, it matters because enrolled fingerprint templates can remain saved after the project is turned off.
- HID
- Human Interface Device is a USB device class used for keyboards, mice, gamepads and similar controls. If a board supports HID over USB, it can act like an input device to a computer without needing a custom driver.
- LiPo
- A lithium polymer rechargeable battery commonly used in portable electronics projects. It matters because LiPo batteries need correct charging circuitry and care, and this board includes hardware intended for that battery type.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- PWM
- Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
- SRAM
- Fast temporary memory used by a processor while a program is running. More SRAM helps with projects that handle larger data buffers, networking, displays, or more complex code.
Find this product in
Wearables & E-textiles
Related Tutorials
Free guides on learn.littlebird.com.au
