Expansion boards that are easily clickable on the Arduino board for additional functionality and connectors. These shields are made for Arduino UNO, Arduino Mega, Arduino Leonardo or all 3. There are also some shields specially for Arduino Nano.
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The 3 most popular Shields

Arduino is an open-source electronics platform based on easy-to-use hardware and software. Arduino boards are able to read inputs - light on a sensor, a finger on a button, or a Twitter message - and turn it into an output - activating a motor, turning on an LED, publishing something online.

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