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How to make 7 Segment with 7404(Not gate) , 7408(And gate) and 7432(Or gate)

About 7 Segment :
  • 7 Segment is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex Dot matrix Displays.


Components:


The creation process

7 Segment Lighting There are seven different types of display boxes. So we need to find the Boolean Expression To allow the fire to continue if the fire exceeds the required temperature.


Step 1


First, we come to the Datasheet, or each of its legs, as we can see in the left-most three-dimensional images of Seg g's feet, and then of Seg f. Is the leg of the Gound, and the right is the Seg a foot, and the right is the Seg b foot. The middle one is the Gound leg, then the middle is the Seg c foot To the right is the foot of the DP or Decimal point.

Step 2

We have a new 4 Digit table from A, B, C, D that represents any Digit that gets a value from a , b , c , d , e , f , g of 7 Segment.

we can write equation this following:
a = A'B'C'D' + A'B'CD' + A'B'CD + A'BC'D + A'BCD' + A'BCD + AB'C'D' + AB'C'D
b = A'B'C'D' + A'B'C'D + A'B'CD' + A'B'CD + A'BC'D' + AB'C'D' + AB'C'D' + AB'C'D
c = A'B'C'D' + A'B'C'D + A'B'CD + A'BC'D' + A'BC'D + A'BCD' + A'BCD + AB'C'D'                  + AB'C'D
d = A'B'C'D' + A'B'CD' + A'B'CD + A'BC'D + A'BCD' + AB'C'D' + AB'C'D
e = A'B'C'D' + A'B'CD' + A'BCD' + AB'C'D'
f = A'B'C'D' + A'BC'D' + A'BC'D + A'BCD' + AB'C'D' + AB'C'D
g = A'B'CD' + A'B'CD + A'BC'D' + A'BC'D + A'BCD' + AB'C'D' + AB'C'D

Solution:


To know a b c d e f g we need to look from top to bottom by A B C D, we choose only the values that are 1 of the values of a b c d e f g but 0 we don't apply at this time.

a = A'B'C'D' + A'B'CD' + A'B'CD + A'BC'D + A'BCD' + A'BCD + AB'C'D' + AB'C'D
         ​​​ ​​                     Substitute the value of A B C D in the equation
     = B'D' + B'D' + C + BD + C + BD + A + A  (That A + A = A )
     = A + C + BD + B'D'
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