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Transmit text data using TX and RX pins.
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Measure environmental changes with variable voltage sensors.
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Sensors that output HIGH or LOW, like motion detectors.
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Represents binary values (1 or 0).
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Uses sound waves to detect how far an object is.
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Continuous range of values like volume or light level.
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Converts varying voltages into digital data.
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Converts numbers back into voltages or sounds.
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Controls brightness or speed by turning signals on/off fast.