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Use a cellular module to send a text or place a call and learn how devices communicate beyond Wi-Fi.

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Save sensor readings to a memory card and discover how a project can create its own small dataset.

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Send environmental data wirelessly between a transmitter and receiver and learn how a distributed sensor system works.

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Keep time even when your Arduino restarts and learn how computers represent seconds, minutes and dates.

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Turn motion and orientation into an alarm so a simple tilt switch becomes a smart input.

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