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32.768 kHz Crystal : For accurate timing applications. User LEDs and Buttons : 3 user LEDs and 1 user button for easy interaction. ST Zio Connector : Extends Arduino Uno V3 connectivity.
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.