DIGITAL CLOCK A Digital Timer Implementation using 7 Segment Displays

GROUP MEMBERS

Arsalan Arif Maryam Ikram Fahad Tariq

A digital display which consists of seven LED segments is commonly utilized to display decimal numerals in digital systems. Various familiar illustrations are electronic calculators and watches where one 7-segment display device is utilized for displaying one numeral 0 through 9. To use this display device, the data has to be converted by some binary code to the code essential for the display. Frequently the binary code utilized is Natural BCD.

BCD-TO-SEVEN-SEGMENT DECODER:

BLOCK DIAGRAM

TRUTH TABLE

Decimal Digits   Input   Output    A B C D a b c d e f g

0 0 0 0 0 1 1 1 1 1 1 01 0 0 0 1 0 1 1 0 0 0 02 0 0 1 0 1 1 0 1 1 0 13 0 0 1 1 1 1 1 1 0 0 14 0 1 0 0 0 1 1 0 0 1 15 0 1 0 1 1 0 1 1 0 1 16 0 1 1 0 0 0 1 1 1 1 17 0 1 1 1 1 1 1 0 0 0 08 1 0 0 0 1 1 1 1 1 1 19 1 0 0 1 1 1 1 0 0 1 1

K-mappingi) K-map and Logic Diagram for Digital Output ‘a’

A = B‾ D‾ + BD + CD + A

K-mappingi) K-map and Logic Diagram for Digital Output ‘b’

B = B‾ + C‾D‾ + CD

K-mappingi) K-map and Logic Diagram for Digital Output ‘c’

C = B + C‾ + D

K-mappingi) K-map and Logic Diagram for Digital Output ‘d’

D = B‾D‾ + CD‾ + B‾C +BC‾D

K-mappingi) K-map and Logic Diagram for Digital Output ‘e’

E = B‾D‾ + CD‾

K-mappingi) K-map and Logic Diagram for Digital Output ‘f’

F = A + C‾ D‾ + BC‾ +BD‾

K-mappingi) K-map and Logic Diagram for Digital Output ‘g’

G = A + BC‾ + B‾C+ CD‾

CIRCUIT DIAGRAM

COMPONENTS USED 7 SEG COM ANODE 74LS90 COUNTER

AND GATES BCD TO 7 SEG DECODER

ALTERNATOR INVERTER

TOOL USED

PROTEUS DESIGN SUITE 8.0

PROFESSIONAL

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