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This allows you to use the board to power servos and large numbers of LEDs. The adapter should be 9 - 12V DC, 250mA or more, have a centre pin positive 2.1mm plug. Arduino, describes a set of boards that provide easy to use hardware and software that allows people to construct interactive projects using all manner of electronics.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.