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Scenario in details

for Designing a combinational circuit appropriate for a Hotel-Automation system that consists of the following outputs: Automate Window, Automate A/C, Automate Light, Automate Door, Automate Curtain, Automate TV, Automate water flush and Automate coffee maker using decoder.

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Decoder converts one type of coded information to another form. A decoder has ‘n’ inputs and an enable line (a sort of selection line) and 2n output lines. Let us see diagram of 3×8 decoder which decodes a 3 bit information and there is only one output line which gets the value 1 or in other words, out of 23= 8 lines only 1 output line is selected. Thus, depending on selected output line the information of the 3 bits can be recognized or decoded.

Logical Circuit

Truth table

A2 A1 A0 D0 D1 D2 D3 D4 D5 D6 D7
0 0 0 1
0 0 1 1
0 1 0 1
0 1 1 1
1 0 0 1
1 0 1 1
1 1 0 1
1 1 1 1

BOOLEAN EXPRETION

D0 = A0′ A1′ A2′
D1 = A0 A1′ A2′
D2 = A0′ A1 A2′
D3 = A0 A1 A2′
D4 = A0′ A1′ A2
D5 = A0 A1′ A2
D6 = A0′ A1 A2
D7 = A0 A1 A2

Logic gates for the Hotel-Automation

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