Arduino LilyPad Main Board

Arduino LilyPad Main Board

Product Description:

Arduino LilyPad Main Board
This is LilyPad Arduino - the main board consisting of an ATmega168V with the Arduino bootloader and a minimum number of external components to keep it as small (and as simple) as possible. Board will run from 2V to 5V. The latest version of the LilyPad supports automatic reset for even easier programming. The back side of the LilyPad is now completely flat! It has a surface mount programming connector to keep the header from poking through.

The LilyPad is compatible with an FTDI cable and the Arduino LilyPad/Pro/ProMini Programmer. This allows the LilyPad to work with the auto-reset feature used in the Arduino software. The LilyPad is no longer compatible with the LilyPad USB Link.

LilyPad is a wearable e-textile technology developed by Leah Buechley and cooperatively designed by Leah and SparkFun. Each LilyPad was creatively designed to have large connecting pads to allow them to be sewn into clothing. Various input, output, power, and sensor boards are available. They're even washable!

The Arduino LilyPad required an FTDI cable or the Arduino LilyPad/Pro/ProMini Programmer to download the program.


50mm outer diameter
Thin 0.8mm PCB


The LilyPad Arduino is a microcontroller board designed for wearables and e-textiles. It can be sewn to fabric and similarly mounted power supplies, sensors and actuators with conductive thread. The board is based on the ATmega168V (the low-power version of the ATmega168) (datasheet). The LilyPad Arduino was designed and developed by Leah Buechley and SparkFun Electronics.


Schematic: LilyPad_schematic_v18.pdf

EAGLE (CAD) Files:


Warning: Don't power the LilyPad Arduino with more than 5.5 volts, or plug the power in backwards: you'll kill it.

Operating Voltage2.7-5.5 V
Input Voltage2.7-5.5 V
Digital I/O Pins14 (of which 6 provide PWM output)
Analog Input Pins6
DC Current per I/O Pin40 mA
Flash Memory16 KB (of which 2 KB used by bootloader)
EEPROM512 bytes
Clock Speed8 MHz


The LilyPad Arduino can be programmed with the Arduino software (download). *Note*, the LilyPad Arduino should only be programmed with software versions 0010 or higher. You can program it with earlier versions, but all of the time related functions will be off (twice as slow as they should be).

The ATmega168V on the Arduino LilyPad comes preburned with a bootloader that allows you to upload new code to it with the Arduino software. The bootloader on the most recent LilyPad boards is Limor Fried's "no wait" bootloader. When the LilyPad is supplied with power, its Arduino sketch starts immediately. The bootloader is triggered only when the reset switch is pressed. You can also bypass the bootloader and program the ATmega168V through the ICSP (In-Circuit Serial Programming) header; see these instructions for details.


The LilyPad Arduino can be powered via the USB connection or with an external power supply.

If an external power supply is used, it should provide between 2.7 and 5.5 volts. This can come either from an AC-to-DC adapter (wall-wart) or battery. Again, don't power the LilyPad Arduino with more than 5.5 volts, or plug the power in backwards: you'll kill it.

Physical Characteristics

The LilyPad Arduino is a circle, approximately 50mm (2") in diameter. The board itself is .8mm (1/32") thick (approximately 3mm (1/8") where electronics are attached).


Wash at your own risk - we do ;). We recommend washing projects by hand with a mild detergent. Drip dry. Make sure you remove your power supply first!

More Information

To get your LilyPad Arduino working, see this guide.