Name of the project: Logic Gate Tester for DELD EE3114 1.1Abstract: Performing various types of logic operation we need to use logic gates and in integrated circuit there are more than one gates fabricated in a single IC. Before using gates for various purposes we need to check logic gates including all logic combination considering in Binary (Logic 1 & 0) needs to implement. It is a time consuming task to check all the input combinations, thus the sole purpose of this project to make it automatic to check all the logic .

1. Date of Submission
23-Jan-2019
Course No: EE3200
Course Title: Electrical and Electronic Project Design
Report on
Logic Gate Tester for DELD EE3114
Submitted To
Dr.Md.Habibullah
AssistantProfessr
Dept of EEE, KUET
Submitted By
Md. Jikrul Sayeed Hossain
Roll: 1503048
Dept of EEE, KUET

2. 1
Name of the project: Logic Gate Tester for DELD EE3114
1.1Abstract:
Performing various types of logic operation we need to use logic gates and in
integrated circuit there are more than one gates fabricated in a single IC. Before
using gates for various purposes we need to check logic gates including all logic
combination considering in Binary (Logic 1 & 0) needs to implement. It is a time
consuming task to check all the input combinations, thus the sole purpose of this
project to make it automatic to check all the logic .
1.2Objectives:
i) To make an automatic system to check logic gates.
ii) To Display every checking information including all logic
combinations.
iii) To learn about designing PCB & making it by hand.

3. 2
1.3Introduction:
Logic gates are the basic building blocks of any digital system. It is an electronic
circuit having one or more than one input and only one output. The relationship
between the input and the output is based on a certain logic. Based on this, logic
gates are named as AND gate, OR gate, NOT gate, NAND gate, NOR gate, EXOR gate
and EXNOR gate.
AND Gate
A circuit which performs an AND operation is shown in figure. It has n input
(n >= 2) and one output.
Logic diagram Truth Table
OR Gate
A circuit which performs an OR operation is shown in figure. It has n input (n
>= 2) and one output.
Logic diagram Truth Table

4. 3
NOT Gate
NOT gate is also known as Inverter. It has one input A and one output Y.
Logic diagram Truth Table
NAND Gate
A NOT-AND operation is known as NAND operation. It has n input (n >= 2)
and one output.
Logic diagram Truth Table
NOR Gate
A NOT-OR operation is known as NOR operation. It has n input (n >= 2) and
one output.
Logic diagram Truth Table

5. 4
XOR Gate
XOR or Ex-OR gate is a special type of gate. It can be used in the half adder,
full adder and subtractor. The exclusive-OR gate is abbreviated as EX-OR
gate or sometime as X-OR gate. It has n input (n >= 2) and one output.
Logic diagram Truth Table
XNOR Gate
XNOR gate is a special type of gate. It can be used in the half adder, full
adder and subtractor. The exclusive-NOR gate is abbreviated as EX-NOR gate
or sometime as X-NOR gate. It has n input (n >= 2) and one output.
Logic diagram Truth Table
In this project moreover we need to use power supply for constant supply. Which
we use 7809 IC’s & an Arduino Mega is being used to implement logic conditions
automatically. 12 LCD’s are being used to indicate the result to confirm which gate
is Good & which one is Bad.

6. 5
1.4Circuit Diagram:
fig1: Main Circuit Diagram without Arduino
Fig2: Main Circuit Diagram with Arduino MEGA

7. 6
1.5PCB Diagram:
Fig3: PCB Diagram Footer.
1.6WorkingPrinciple:
As we know that High Voltage (+5VDC) as a logic HIGH or 1 and Low Voltage (0VDC)
as a logic LOW or 0 is used in Binary Calculation. Here a Arduino Mega is used to
set various DIGITAL PIN as HIGH(1) LOW(0) combination for 2 input get like HIGH
HIGH , LOW HIGH , HIGH LOW , LOW LOW combinations. Then we use another PIN
to read the output state of the Gate and compare the output with the predefined
LOGIC table previously saved in the ARDUINO MEGA memory Unit. If the conditions
matched (all combination) then we can call the Gate as good & the Green LED is
being bright for corresponding gate in the IC. If any of the combinational output
makes a false result after comparing with Truth Table then the gate will be declared
as BAD gate and Red light is being bright for the corresponding number of Gate in
the IC. This process is being set with the respective IC number which needs to give
from the user interface keyboard & a display also shows the running logic that is
being used to check to find out the logic gate as good or bad.

8. 7
1.7Operating Principle:
Plug IN to 220V line of Power suppy
Put your IC on Zif Socket from left
Enter you IC number
Press “#” to Confirm IC number
LCD will Show the Logic’s
& LED will Show the gate’s Condition as
Green is good & Red is Bad

9. 8
1.8List of Permissible IC for the Project Prototype: (Table 1.1)
IC Number Name Number of
input
Number of
Gate
7400 2-input NAND 2 4
7402 2-input NOR 2 4
7404 NOT 1 6
7408 2-input AND 2 4
7432 2-input OR 2 4
7486 2-input EXOR 2 4
74286 2-input EXNOR 2 4
7411 3-input AND 3 3
1.9List & Cost of component:
SL NO Name Rating Quantity Cost(tk)
1. Ardunio Mega2560 ATmega2560
microcontroller
Input voltage - 7-12V
54 Digital I/O Pins (14
PWM outputs)
16 Analog Inputs
256k Flash Memory
16Mhz Clock Speed
01 850
2. 16*2 LCD Display Vdd -Vss (0-5VDC)
Imax 3mA
Duty 1/16
16*2 characters
built-in 5*8 alpha
numeric character ROM
standard 4bit or 8bit
parallel interface
01 180
3. 4*4 Key Pad Cable Length: 3.3 inch
Keypad Width: 2.7 inch
Keypad Length : 3.0inch
Number of keys: 16
Matrix: 4×4
01 75
4. Zif socket (28 pin)
(IC base)
ZIF (zero insertion force)
design
01 85

10. 9
contacts: 28
lead pitch 0.1" (100 mil)
an ideal IC test socket
5. LED
(Green & Red)
Vf= 1.90V
Rated If=10mA
14 28
6. Registor 220ohm, 1k ; 0.5W 2 4
7. Variable Registor 10K 1 15
8. IC7809 Output Voltage:9V
Peak Current:2.2A
Short Circuit
Current:250mA
1 15
9. Transformer
(220/12V)
Primary Voltage:220V
Secondary Voltage:12V
Current rating:1A
1 110
10. Plug 220V,10A 1 20
11. PCB Board 1 280
12. Jumper
Male to male
Male to female
As required 20
13. Connector Copper (26G) As required 20
14. Test IC’s
(Logic Gates)
7804,7808 As required 30
Total Cost: 1732tk
1.10Description of Circuit Component: [Pictorial View of Circuit Components]
Arduino Mega R3 2560 16*2 LCD Display (LMB162ABC)

11. 10
4*4 Key Pad Zif socket (28 pin)
LED (RED) 10K (Potentiometer)
IC7809 220/12V 1A step down transformer
Fig4: Pictorial View of Used Circuit Component

12. 11
1.11Practical Implementation:

13. 12
Fig5: Practical view of circuit Implementation

14. 13
1.12Conclusion:
This is a project to check logic gates simply & automatically. The basic principle of
checking gates is that every logic has an individual truth table and we set the truth
table in memory when we call it through IC number it will check the truth table
and give the result of the IC conditions. This project is designed to use in the
Digital Electronics and Logic Design Laboratory (a course of EE3114) to make IC
checking easily and reduce the time.
1.12Future Improvement:
This project has a lot of possibilities as follows:
1) Adding 3 input IC’s
2) The circuit and code can be made more advanced to check other IC’s such as
T, D, F flip-flop.
3) Some modified truth tables to compare any other complete circuits those
are made by Logic Gates.
1.13 References
i) Digital Logic and Computer Design by M. Morris Mano
ii) www.en.wikipedia.org/wiki/Logic_gate