This is an affordable set of five White LilyPad LEDs.
The LilyPad is a collection of electronic circuits and accessories for Arduino. Most components feature connecting pads so you can sew them into clothing and are even washable! Various input, output, power, and sensor boards are available.
You can also use LilyPad components, like this switch, for science demos and classroom projects by connecting them with alligator clips cables.
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