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Question:

How to use infrared sensors, people close to the object a certain distance and issued a warning?

Specifically can say that how to make outside the light signal into a control signal, how to achieve control? Need a single chip?

Answer:

A launch tube, a receiving tube, side by side. When the person approaches, the emitted infrared rays are reflected and received by the receiving tube. Resulting in the receiver tube to generate a signal, through the component processing on the line. Do not need to use single-chip.

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