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Logic circuit for an automatic door

This is a  "BCD To Seven Segment Decoder" made using Logic Gates.

A decoder is a digital circuit that detects the presence of a specified combination of bits (code) on its inputs and indicates the presence of that code by a specified output level. In its general form, a decoder has n input lines to handle n bits and from one to 2ⁿ output lines to indicate the presence of one or more n-bit combinations. 

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