TUTORIAL ABOUT SEVEN SEGMENT DISPLAY PIN DIAGRAM, INTERNAL CIRCUIT AND HOW 7 SEGMENT DISPLAY WORKS

 seven-segment L.E.D. display.

A seven-segment display may have 7, 8, or 9 leads on the chip. Usually leads 8 and 9 are decimal points. The figure below is a typical component and pin layout for a seven segment display. 

                                                      SEGMENT DISPLAY

The light emitting diodes in a seven-segment display are arranged in the figure below. 

                     DIODE PLACEMENT IN A SEVEN SEGMENT DISPLAY, NO DECIMAL

There are two types of displays available, common anode and common cathode.

The wiring for a common anode is shown below. 

                                           COMMON ANODE INTERNAL WIRING

The wiring for the common cathode is shown below. 

COMMON CATHODE INTERNAL WIRING

To convert the binary numbers to signals that can drive the L.E.D.s in the display you need a display driver. In the lab we use an MC14511 chip. The pinouts are shown below. U17MC1451112345678910111213141516BCLTBILEDAGNDedcbagfVcc 

                         PIN OUTS FOR THE MC14511 SEVEN-SEGMENT DISPLAY DRIVER

A, B, C, and, D are the binary inputs.

a, b, c, d, e, f, and g are the driver signals to the display elements.

LT is the Light Test control, turns all segments on, active low.

BL blanks all the segments when activated, active low.

LE is the latch enable control.

The truth table shown below is used to confirm that the digital signal sent to the display lights up the correct segment. 

TRUTH TABLE FOR THE SEVEN-SEGMENT DISPLAY

The internal circuitry and logic gates for the display is shown below.

INTERNAL CIRCUITRY AND LOGIC GATES FOR 7 SEG DISPLAY

The specific seven-segment display used in lab is an LN513RK. The schematic below is similar to the one you will use in lab. 

SEVEN SEGMENT DISPLAY WITH DISPLAY DRIVER

To have the driver convert the binary input to signals ready for the display, tie pin 3, LT, and pin 4, Bl, to VCC. Connect pin 5, LE, to ground. In this configuration what ever the binary inputs at A-D are will be converted and the display will show the decimal equivalent.

ELECTRICAL ENGINEERING PROJECT TOPICS PART2

1. Wireless power theft monitoring system and indication at local substations
2. Smart Wireless Temperature Data Logger (IEEE-)
3. Timer based Electrical Oven temperature monitoring and control for Metal Industries
4. An On-line Monitoring System of Transmission Line Conductor Deicing(IEEE-)
5. An On-line Monitoring System of Temperature of Conductors and Fittings Based on GSM SMS and Zigbee(IEEE-)
6. Triac and optically isolated diac based electrical oven temperature monitoring and controlling system with zero-crossing detector
7. High voltage fuse blown indicator with display on PC with optical isolation between PC and HV bus bars
8. Electrical Data (voltage, current, frequency etc) Logger The purpose of this project is to log electrical data at remote locations like substations The data is sensed using various electrical sensors and processed by microcontroller This processed data is stored in a MMC memory stick connected to the microcontroller board This data can be downloaded to computer for further processing
9. DTMF mobile phone controlled dam water gates controlling system with high-level protection
10. RC IR Based Remote Device Switching
11. Motor speed monitoring and control system using GSM modem
12. Home Network Configuring Scheme for All Electric Appliances Using ZigBee-based Integrated Remote Controller
13. Transformer oil temperature monitoring with automatic Circuit Breaker operation
14. Method of Measuring Power Quality and Development of Monitor Device (IEEE-)
15. SCADA system design and construction for real-time electrical parameter monitoring and control
16. DC Motors speed synchronization for rolling mills
17. Graphical LCD and Touch Screen based Electrical devices control system
18. Wireless SCADA
19. RF based Wireless Electrical Devices Controller
20. Microconroller and Touchscreen controlled motor speed and direction controlling system
21. DC Motor Speed and direction control using RF/IR/Zigbee technologies
22. A Smart Card Based Prepaid Electricity System
23. GSM based Irrigation Water Pump Controller for Illiterates (No Mobile phone operation knowledge required)
24. Implementation of wireless sensors network based industrial temperature monitoring system
25. GSM/Mobile/Cell Phone Based Device Monitoring and Control
26. UPS battery monitoring system over GSM for high availability systems (banking/finance/medical etc)
27. Digital Voltage, Current and Frequency Meter
28. Controlling AC lamp Dimmer through Mobile Phone (IEEE-)
29. Hall Effect sensor based non-contact Tachometer for electrical motors speed measurement
30. Microcontroller based Substation Monitoring and control
31. Hazardous chemical valve control system with stepper motor and line of site remote control
32. RF transceiver (Zigbee/X-Bee) based energy meter monitoring system (Energy Meter reading on PC over wireless comm)
33. MMC/SD card based data logger for energy meter with time and KWH readings for historical data logging and analysis
34. Development of Zigbee based Street Light (IEEE-)
35. High power LED based intelligent streetlight controlling system with automatic brightness control with vehicle presence sensor (GSM optional)
36. High voltage fuse blown indicator with Voice based announcement system
37. Wireless Energy Meter reading on hand-help device based on RF Transceiver
38. Auto-Credit Energy Metering System using mifare card
39. Automatic Intelligent Plant Watering System
40. DC Motor Speed and direction control over GSM Mobile/Modem
41. A Novel Wireless Self-powered Microcontroller-based Monitoring Circuit for Photovoltaic Panels in Grid-connected Systems (IEEE-)
42. Wireless electrical devices monitoring and controlling system for industrial applications
43. Frequency Locked Loop (FLL) DC Motor Speed Control
44. Mobile phone controlled Street Light monitoring and control system
45. Radio Frequency (RF) based Wireless Control Of DC/Stepper Motor Speed Control
46. PWM based DC Motor Closed loop Speed Controller
47. Multiple Transformers oil temperature monitoring with automatic circuit breaker operation with SMS based alerts
48. Touchscreen based advanced temperature monitoring and control system with graphical LCD
49. Timer based automatic power cutoff for industrial sealing/packaging machines
50. SCADA implementation based on wireless RF technology (IEEE-)
51. Contact less Motor speed monitoring on Graphical display with high and low speed alerts
52. Microcontroller based Single phasing preventor
53. Energy meter per-day average, Max and Min Load display on Graphical LCD
54. Energy meter monitoring and control system using SMS technology(IEEE-)
55. Microcontroller based Solar Tracker with Stepper Motor Control
56. Microcontroller based refrigeration control system
57. IR Remote controlled Irrigation water pump controller with single phasing protection
58. -wired resistive touch screen controlled lamp dimmer for next generation apartments with Optical isolation and zero crossing detectors
59. Energy Tapping Identifier Through Wireless Data Acquisition System
60. The Robot that follows the (Infrared) Light
61. GSM based SCADA implementation using Microcontroller
62. Touchscreen controlled lamp dimmer for next generation apartments
63. Substation Fuse blown Indicator
64. Resistive Touch screen controlled contact less speed monitoring and controlling of dc motor with speed limit alerts
65. Industrial/power grid electrical parameter Data Acquisition system through wireless technology
66. Wireless Energy Meter monitoring system with automatic tariff calculation
67. Touch Screen based digital devices control system This project is to build a Graphical LCD Touch Screen interface for switching electrical devices The controlled devices can be of high voltage or low voltage
68. Energy meter data logging system with Realtime clock and KWH readings Very useful for historical data logging and analysis
69. Frequency Locked Loop DC Motor speed monitoring and control system
70. Construction of central control unit for Irrigation water pumps Cost effective method to control entire villagers water pumps with user level authentication Illiterates friendly system
71. Password enabled pre-paid liquid/milk dispensing system
72. Voice enabled devices switching for visually impaired
73. GSM/Mobile/Cell Phone Based Device Monitoring and Control System
74. Touchscreen operated industrial oil dispensing system (OIL SCADA)
75. PIR based energy conservation system for corporate Computers and lighting system
76. -phase irrigation water pump controller for illiterates using dual GSM Modems
77. Mobile technology (GSM) based remote monitoring and control of digital Energy meter Useful for Electricity Department personal for remote meter reading Also useful to disconnect the power supply to consumer in case of non-payment of electric bill This is also used to exchange messages like power cut timings with the consumers
78. GSM Based Automatic Irrigation Water Controller System
79. Motor Speed Monitoring over GSM Mobile
80. Dual (active and standby) Lithium-ion battery charger for continuous non-interrupted power supply to critical loads
81. Design and construction of Earth fault relay for single phase power system
82. IR (Infrared) Remote based Stepper Motor Speed and Direction Controller
83. Microcontroller based Generator/Alternator Control and Monitoring System
84. Talking energy (KWH) meter 

click here to download project topics

ELECTRICAL ENGINEERING PROJECT TOPICS FOR FINAL YEAR STUDENTS PART 1

1. INDUSTRIAL PROCESS CONTROL AND AUTOMATION SYSTEM
2. IC PROTOCOL IMPLEMENTATION OF HANDHELD ELECTRONIC VOTING MACHINE VIA DATA RETRIEVAL SYSTEM IN EEPROM
3. FINGER PRINT BASED AUTHENTICATION AND CONTROLLING SYSTEM OF DEVICES
4. AUTOMATED PREPAID ENERGY METER CONSUMPTION SYSTEM

5. LOCATION BASED HUMAN IDENTIDICATION AND TRACKING SYSTEM USING RFID
6. WEB CAMERA POSITIONING SYSTEM
7. IC PROTOCOL IMPLEMENTATION FOR DEVICE CONTROL AND STATUS MONITORING SYSTEM
8. PWM BASED INVERTER USING AVR
9. A LOW-COST YET ACCURATE APPROACH TO A VEHICLE LOCATION TRACKING SYSTEM
10. RFID BASED SECURITY SYSTEM
11. ARM PROCESSOR BASED REMOTE BIO - MEDICAL INVESTIGATION WITH GSM AND MULTIPLE SENSOR INTERFACE
12. CRYPTOGRAPHIC SECURED COMMUNICATION FOR MILITARY APPLICATIONS
13. BATCH PROCESS CONTROL SYSTEM
14. INTELLIGENT AND AUTOMATIC FIRE SECURITY SYSTEM USING INTERACTIVE VOICE DECODER AND TELEPHONE LINE
15. AUTOMATIC DC MOTOR SPEED CONTROL WITH AUTOMATIC FEEDBACK VIA SMS     USING PWM TECHNOLOGY
16. PORTABLE CALORIMETER
17. IMAGE RECONSTRUCTION USING NEURAL NETWORKS
18. CELL PHONE BASED MOTOR SPEED CONTROL
19. WIRELESS CONTROL OF APPLIANCES & DEVICES BY MOBILE PHONE USING DTMF TECHNOLOGY
20. STEP CLIMBING ROBOT
21. ROUTING, GUIDING, OBSTACLE DETECTING AND CONTROLLING OF VEHICLE USING ACTIVE RFID TECHNOLOGY
22. MULTIPOINT REMOTE MONITORING AND DATA ACQUISITION SYSTEM USING RF TECHNOLOGY
23. CRYPTOGRAPHIC BASED ENCRYPTION AND DECRYPTION FOR SECURED WIRELESS COMMUNICATION FOR MILITARY APPLICATIONS WITH ARM PROCESSOR
24. FINGER PRINT IDENTIFICATION SYSTEM
25. FUZZY LOGIC BASED BIO MEDICAL INVESTIGATION
26. AUTOMATIC ACCIDENT IDENTIFICATION, DETECTION VIA VIBRATION SENSORS USING RF TECHNOLOGY
27. FINGER PRINT BASED AUTHENTICATED, ACCESS CONTROL AND AUTOMATED DOOR OPENING SYSTEM
28. TSUNAMI ALERT
29. OVER SPEED AND DRUNKEN DRIVE INDICATOR
30. RC PROTOCOL BASED CONTROLLER COMMUNICATION AND DEVICE CONTROL
31. RFID BASED ATTENDANCE CARD SYSTEM
32. ARM PROCESSOR BASED WIRELESS HOME APPLIANCES MONITORING & CONTROL SYSTEM USING GSM TECHNOLOGY
33. DYNAMIC & AUTOMATIC PROGRAMMABLE TEMPERATURE CONTROL SYSTEM FOR INDUSTRIAL MACHINERIES SAFETY CONTROL SYSTEM
34. RFID BASED HUMAN / VEHICLE DETECTION AND MONITORING SYSTEM
35. AUTOMATIC DOOR OPENING USING PIR SENSOR
36. REMOTE ACCESS CONTROL AND AUTOMATION SYSTEM FOR ELECTRONIC APPLIANCES USING TELEPHONE LINE
37. MOBILE TO PC INTERFACE FOR CONTROLLING
38. RFID BASED VEHICLE IDENTIFICATION AND SPEED MEASUREMENT
39. INDUSTRIAL ROBOT
40. AUTONOMOUS NAVIGATION OF RFID SENSING ROBOTS FOR BLIND PERSONS
41. A NOVEL REAR-END COLLISION, ACCIDENT AVOIDANCE, DISTANCE MEASURING USING ULTRASONIC TECHNOLOGY
42. SPEED CONTROL OF AC MOTORS USING SCR
43. CENTRALIZED MONITORING SYSTEM FOR CALL TAXIES
44. PIR SENSOR BASED HUMAN ACCIDENT PREVENTION WITH VEHICLES (AUTO-BREAKING ON SCANNING HUMAN)
45. ACCIDENT IDENTIFICATION USING GPS AND GSM
46. AUTOMATIC, DYNAMIC POWER SAVING AND CONTROL SYSTEM
47. VOICE BASED PATH CONTROL OF ROBOT VIA THE PC USING RF COMMUNICATION TECHNOLOGY
48. AUTOMATIC STEERING OF FARM VEHICLES USING GPS TECHNOLOGY
49. AUTOMATIC PLANT IRRIGATION
50. INTERNET BASED HOME AUTOMATION SYSTEM USING JAVA
51. INTERACTIVE ENVIRONMENTAL AIR POLLUTION MONITORING AND AUTOMATIC PHONE DIALING SYSTEM
52. MICROCONTROLLER - MICROCONTROLLER COMMUNICATION FOR REMOTE CONTROL OF DEVICES USING RF TECHNOLOGY WITH INTERACTIVE LCD
53. DATA ACQUISITION SYSTEM USING VB FRONT END AS DATA LOGGER
54. GPS VEHICLE THEFT IDENTIFICATION AND TRACING AND CONTROL SYSTEM
55. INSTALLATION OF CENTRALIZED CONTROL STATION USING ARM FOR MONITORING CABS AND VEHICLES USING ARM PROCESSOR
56. BUS NUMBER ANNONUNCEMENT AND IDENTIFICATION FOR BLIND PEOPLE
57. FULL DUPLEX µC TO µC COMMUNICATION
58. AUTOMATIC METER READING SYSTEM (ARM BITS) LPC
59. PIR SENSOR BASED MOTION DETECTION SYSTEM FOR SECURITY
60. GSM-BASED WIRELESS HOME APPLIANCES MONITORING & CONTROL SYSTEM
61. RFID BASED AUTHENTICATION AND DEVICE CONTROL
62. ADVANCED ENCRYPTION STANDARD USING MICRO CONTROLLER
63. INTERACTIVE EARTHQUAKE MONITORING & LOW FREQUENCY VIBRATIONS & NOISE SENSING SYSTEM
64. AUTOMATIC ELECTRIC PHASE CHANGE OVER
65. DISH POSITION CONTROLLING & MONITORING SYSTEM USED FOR RADAR & OTHER TELECOMMUNICATION APPLICATIONS
66. AUTOMATED AND UNMANNED VEHICLE TOLL COLLECTION / PARKING SYSTEM USING RFID TECHNOLOGY
67. MICROCONTROLLER BASED SYSTEM SHUTDOWN, RESTART, AND LOGOFF USING WIRELESS TECHNOLOGY
68. CONTROLLING THE DIRECTION OF A ROBOT AND FIRE ALERT USING GSM MODEM
69. GSM BASED REMOTE BIO - MEDICAL INVESTIGATION
70. ULTRASONIC BASED BLIND MAN PATH GUIDANCE & CONTROL USING INTERACTIVE VOICE RESPONS SYSTEM (IVRS)
71. LOCATION-BASED SYSTEM FOR MOBILE DEVICES USING RFID
72. MULTICHANNEL PETROCHEMICAL FIRE SENSOR, MONITORING & CONTROL SYSTEM WITH AUTOMATIC TELEPHONE DIALING
73. TAMPERING DETECTION OF ENERGY METER WITH GSM MODEM
74. TRANSFORMER OVER-HEAT PROTECTION USING ARM CONTROLLER WITH INTIMATION TO EB USING GSM TECHNOLOGY
75. SMS BASED WEATHER REPORT
76. INTRUDER DETECTION AND CONTROL SYSTEM
77. SOLAR OPERATED ROBOT
78. IMAGE / VIDEO CAPTURING AND PC TELECASTING ROBOT
79. VEHICLE ACCIDENT PREVENTION USING EYE WINK
80. RFID BASED VEHICLE NUMBER TRACKING AND TRAFFIC MONITORING
81. GAS DETECTION ROBOT FOR ATOMIC POWER STATION
82. INTERNET CONTROLLED DC MOTOR SPEED CONTROL USING JAVA ENVIROINMENT
83. RFID BASED TRAIN IDENTIFICATION AND RAILWAY CROSSING SYSTEM
84. CONTROL OF PC USING DTMF TECHNOLOGY VIA MOBILE PHONE
85. RFID BASED UNMANNED AUTOMATED ELECTRIC POWER TARIFF CALCULATION BY THE REMOTE EB STATION
86. COMPONENT TESTER USING (DIODE, CAP, CONTINUITY, NE, IC
87. IMPLEMENTATION OF CONTROLLER AREA NETWORK (CAN) PROTOCOL FOR DEVICE TO DEVICE COMMUNICATION (WIRED/WIRELESS) IN LPC ARMTDMI
88. INTELLIGENT HOME SECRUITY SYSTEM USING INTERACTIVE VOICE RESPONSIVE SYSTEM
89. AT KEYBOARD BASED PASSWORD PROTECTED DOOR ACCESS SYSTEM
90. WIRELESS SERIAL COMMUNICATION LINK FOR CHATTING AND CONTROLLING OF DEVICES USING RF TECHNOLOGY
91. DESIGN AND DEVELOPMENT OF BOMB DETECTING ROBOT
92. AN IC NETWORK PROTOCOL FOR ENVIRONMENT MONITORING
93. MULTIPLE DATA ACQUISITION MONITORING SYSTEM WITH ARM PROCESSOR, USING VISUAL BASIC AS FRONT END
94. PLANT WATER SPLASHING ROBOT
95. WIRELESS MONITORING OF ELECTRICAL PARAMETERS WITH PC
96. MOTOR PARAMETER MONITORING SYSTEM
97. LIVE HUMAN BODY DETECTION ROBOT
98. FIRE-FIGHTING ROBOT
99. ENABLING / DISABLING AND WIRELESS CONTROL OF APPLIANCES & DEVICES BY FM & DTMF SYSTEMS USING RF TECHNOLOGY
100. PULSE WIDTH MODULATION (PWM) BASED SPEED CONTROL OF MOTORS
101. DESIGN AND DEVELOPMENT OF OBSTACLE SENSING AND OBJECT GUIDING ROBOT
102. HOME SECURITY USING GSM
103. IMAGE CAPTURING ROBOT FOR DEFENCE
104. HUMAN MOVEMENT MONITORING USING PIR SENSOR
105. AUTOMATED & UNMANNED CONTROL SYSTEM OF RAILWAY CROSSING USING WIRELESS IR SENSOR, DTMF ENCODER AND FM TECHNIQUE
106. HOME SECURITY SYSTEM WITH AUTO DIALLING (MISSED CALL OR SMS ALERT USING GSM MODEM)
107. MOTOR SPEED CONTROLLER USING CELLULAR PHONE
108. VOICE BASED ACTIVATION AND CONTROL SYSTEM OF DEVICES
109. CELL PHONE BASED ROBOT DIRECTION CONTROL
110. MULTI-TASKING ON THE MICROCONTROLLER RTOS(RTX TINY)
111. GPS BASED VEHICLE THEFT IDENTIFICATION, TRACKING AND CONTROL SYSTEM USING ARM PROCESSOR
112. RFID BASED TRAIN IDENTIFICATION, DETECTION AND UNMANNED RAILWAY CROSSING SYSTEM
113. BOILER MONITORING AND CONTROL SYSTEM
114. MULTIPLE SENSOR INTERFACE (MSI) ALGORITHM WITH ARM PROCESSOR AND IMPLEMENTATION OF IC NETWORK PROTOCOL FOR ENVIRONMENT MONITORING
115. ALCOHOL SENSOR DETECTION FOR DRIVERS IN VEHICLES
116. HUMAN TRACKING SENSING ROBOT
117. CELLPHONE TO CELLPHONE APPLIANCE CONTROL SYSTEM
118. HEART BEAT MONITORING
119. LUGGAGE TRACKING SYSTEM USING RFID
120. OF DEVICES USING DTMF TECHNOLOGY
121. IMPLEMENTATION OF SOLAR CELL TRACING SYSTEM FOR THE MAXIMUM UTILISATION OF SOLAR POWER AND ILLUMINATION
122. AUTOMATIC METER READING SYSTEM (ATC / ARM BIT)
123. INTELLIGENT BRAIN READER AND BIOMETRIC CONTROL SYSTEM OF ELECTRICAL EQUIPMENTS
124. IMPLEMENTATION OF CAN PROTOCOL TO EXPERIMENT THE IDEA OF TEMPERATURE BASED LOGGING
125. PWM BASED SINGLE PHASE INDUCTION MOTOR SPEED CONTROL IN CLOSED LOOP
126. ADVANCED ENCRYPTION STANDARD (AES) IMPLEMENTATION FOR CONTROL OF DEVICES USING RF TECHNOLOGY
127. AXIS ROBOT
128. COMPUTER CONTROLLED MOBILE ROBOT
129. TRANSFORMER OVER-HEAT PROTECTION WITH INTIMATION TO EB
130. GPS AND GSM BASED ACCIDENT IDENTIFICATION USING ARM PROCESSOR
131. REMOTE PROCESS MONITORING THROUGH SMS
132. AUTO CONTROLLING OF PHASE INDUCTION MOTOR


click here to download the project list