Project Report of 7 Segment

BCD to 7 Segment Display

A seven-segment display (SSD), or seven-segment indicator, is a form of electronic display device for displaying decimal numerals.

A seven segment display, as its name indicates, is composed of seven elements. Individually on or off, they can be combined to produce simplified representations of the numerals.

Seven segment display consists of seven elements, that are made of either LCDs (Liquid Crystal Display) or LEDs (Light Emitting Diode) The elements are labeled a-g. where the optional DP decimal point (an "eighth segment") is used for the display of non-integer numbers.

Depending on which elements are turned on, they display decimal numerals 0 through 9.

Each element is turned on when a logic input is applied to its corresponding input lead. The over bar above each letter indicates that it is turned on by an active logic input.

Here, “a” is turned on because the element is

forward biased. The purpose of resistor is to protect the element the current that flows through it.

BCD:BCD (Binary Coded Decimal) is a number system which consisting

of ten different 4-bit patterns of 1s and 0s that represent decimal numbers 0-9.

This table shows how ten BCD numbers shows ten decimal digits. The equivalent decimal value of each BCD number is determined by adding the weight of the bit patterns where 1s are placed.

Decoder has four inputs to which the 4-bit BCD numbers are applied. Each input is labeled with a capital letter, which represents one of the binary-weighted positional values.

Df

Input into the decoder each waveform time period that is an individual BCD number.

Project Components:1. Bread Board2. Logic Gates ICs3. Connecting wires4. Seven segment Display5. Voltage Regulator6. 9v Battery

ICs (Integrated Circuit):1. Invertor (NOT gate)2. AND gate3. OR gate

1.NOT gate:A breadboard is used to make up temporary circuits

for testing or to try out an idea. No soldering is required so it is easy to change connections and replace components. Parts will not be damaged so they will be available to re-use afterwards.

Symbol of NOT gateTruth Table of NOT

IC number: HD74LS04P

Pin configuration:

2.AND gates:I. Quad 2 input AND gate

II. Tripler 3 input AND gateIII. Dual 4 input AND gate

I. Quad 2 Input AND gate:

Symbol of AND gate

Truth Table of AND gate

Truth Table of Triple 3 input AND gate

IC number: HD74LS08P

Pin Configuration:

II. Tripler 3 input AND gate:

IC number: HD74LS11N

Pin Configuration:

III. Dual 4 input AND gate

IC number: SN74LS21N

Pin Configurattion:

3.OR gate:i. Quad 2 input OR gateii. Triple 3 input OR gateiii. Dual 4 input OR gate

i. Quad 2 input OR gate:

IC number: HD74LS32P

Pin Configuration:

Truth Table of OR gate Symbol of OR gate

ii. Triple 3 input OR gate:

IC number: CD4075B

Pin Configuration:

iii. Dual 4 input OR gate:

IC number: CD4072b

Pin Configuration:

Voltage Regulator: L7805CV

Pin Configuration:

Applications of 7-segment display:

seven-segment displays in a wide range of applications.1. Clocks2. Watches3. Digital Instruments4. Indicators5. Traffic signals6. Many Other House appliances. etc

Superior University Riwind Road, Lahore

Project REPORT

DIGITAL LOGIC DESIGN

Submitted By: Syed Intazar Hyder (BEE-10128) Hira Munir (BEE-10143)