Description: The design of the guiding idea is to use infrared emission infrared LED and infrared receiver to receive the infrared control and its amplification, rectification form a line level signal. When there is someone or something to block infrared light, the receiver does not receive infrared control signals, the amplifier output low, while the level control signals into single chip count, and driven by the decoding circuit to digital display value. This will be the number of persons or things to statistics.
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