LilyPad Power Supply

A small, but mighty power supply. This board was designed to be as small and inconspicuous as possible. Pop in a AAA battery, flip the power switch, and you will have a 5V supply to power your LilyPad circuit. Good up to 200mA. Short circuit protected.

This board has AAA battery clips but can use an input from 1.2V to 5V. Our lithium polymer batteries are a good, rechargeable alternative.

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 - but be sure to remove the battery!

Note: A portion of this sale is given back to Dr. Leah Buechley for continued development and education of e-textiles.

  • 56x26mm
  • Thin 0.8mm PCB


LilyPad Power Supply Product Help and Resources

Core Skill: DIY

Whether it's for assembling a kit, hacking an enclosure, or creating your own parts; the DIY skill is all about knowing how to use tools and the techniques associated with them.


Skill Level: Noob - Basic assembly is required. You may need to provide your own basic tools like a screwdriver, hammer or scissors. Power tools or custom parts are not required. Instructions will be included and easy to follow. Sewing may be required, but only with included patterns.
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Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

2 Electrical Prototyping

Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components.
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Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • Member #819969 / about 7 years ago / 1

    Can this power a Lilypad Arduino USB? The Lilypad Arduino USB requires between 2.7 and 5.5 volts. If I insert a AAA battery, that's 1.5V. The description says: "Pop in a AAA battery, flip the power switch, and you will have a 5V supply to power your LilyPad circuit". Does this mean it will scale up my 1.5V to 5V? and thus I'll be able to power my Lilypad Arduino USB. Or does the sentence mean I can insert in the clip any battery between 1.5 and 5V? And then if I put 1.5V, I get 1.5V, which is not enough for the LilyPad Arduino USB.

  • Does this power supply also charge the battery if the battery is rechargeable? Or would you have to connect a Lipo charger for this to recharge a battery? And if it doesn't recharge it, does it have a terminal to connect a charger? Or is this just a basic power supply for the board, with no charging capabilities at all? I know the Lilypad Lipower says you can connect a Lipo charger to it so you can recharge the batteries, too, but I'm kind of confused about this one because it says a lithium polymer battery is a good rechargeable alternative to AAA battery, but doesn't say if the battery has to be charged separately.

    • MrAureliusR / about 9 years ago / 1

      You do realize there's a schematic link right above?

  • Member #503626 / about 10 years ago / 1

    Can you connect multiple things to the one power hole?

    • LED addict / about 10 years ago / 1

      Yes, as long as you do not exceed the 200mA limit.

  • Member #503626 / about 10 years ago / 1

    I'm new to electronics, so I don't really get the power supply output. How do you get 5v from a AAA battery?

    • Kamiquasi / about 10 years ago / 2

      It uses a boost converter setup. Specifically, it uses the NCP1402 that will boost up from as low as 0.8V (even lower, but it requires 0.8V start-up) to 5V with just a few extra components (most importantly, the inductor). It does so at a detriment to battery life (the boost circuit will draw more current from the battery than the device you're powering needs), and a bit of lowered efficiency than if you were to use a 5V battery to begin with.

  • Member #309567 / about 11 years ago / 1

    Is there an alternative to this with a higher current rating? I want to power 5V heating pads which seem to draw 700mA each.

  • Member #200027 / about 12 years ago / 1

    Do you sell just the AAA clips? I've bought your AA clips, but really need the smaller AAA ones

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