Electronics Mini Projects for Engineering Students:

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1 Water Level Controller using 8051 Microcontroller: Here we are designing the circuit which is used to detect and control the water level automatically in overhead tank using 8051 microcontroller. It is used in industries to control the liquid level automatically.

2

Password Based Door Lock System using 8051 Microcontroller: This system demonstrates a password based door lock system wherein once the correct code or password is entered, the door is opened and the concerned person is allowed access to the secured area. After some time, the door would be closed. Read this post completely to get more information.

3 Car Parking Guard Circuit Using Infrared Sensor: This circuit helps the person in the driving seat in such a way that it gives an alarm if there is any obstacle or a wall while parking or while driving in reverse. It is very useful in our real life.

4 Battery Charger Circuit Using SCR: Here is the circuit diagram of battery charger circuit using Silicon Controlled Rectifier. SCR can be used in half wave rectifier, full wave rectifier, inverter circuits, power control circuits, etc.

5 Interfacing GPS with 8051 Microcontroller: In this interfacing of GPS with 8051 circuit, GPS module calculates the position by reading the signals that are transmitted by satellites.

6 Speed Control of DC Motor Using Pulse Width Modulation: This pulse width modulation technique is the more efficient way to proceed to manage the speed of our DC motor manually.

7 Metal Detector Circuit: This is a simple metal detector circuit which is very useful for checking the person in shopping malls, hotels, cinema halls to ensure that person is not carrying any explosive metals or illegal things like guns, bombs etc.

8 Thermistor Temperature Sensing Alarm: This circuit is a temperature sensing as well as alarm circuit. The circuit raises an alarm whenever the temperature crosses a certain limit.

9

FM Remote Encoder/Decoder Circuit: This is a simple post which shows you how to design FM remote encoder and decoder circuit using RF600E and RF600D ICs. This pair of encoder and decoder ICs establishes the communication with high level security. The operating voltage of these ICs is from 2V to 6.6V DC.

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Wireless Mobile Battery Charger Circuit: This circuit mainly works on the principle of mutual

inductance. This circuit may be used as wireless power transfer circuit, wireless mobile charger circuit, wireless battery charger circuit, etc.

11 Simple 100W Inverter Circuit: This is a small Inverter circuit which converts the direct current (DC) to alternating current (AC).

12 Battery Level Indicator: This article explains you how design battery level indicator. You can use this circuit to check car battery or inverter. So by using this circuit, we can increase the lifetime of battery.

13 FM Radio Circuit: FM Radio circuit is the simple circuit that can be tuned to the required frequency locally. This article describes the circuit of FM radio circuit. This is a pocket sized radio circuit.

14 LED Lamp Circuit using USB Port: This is a simple USB LED Light circuit which produces an output of 5v. It may be used as emergency light and also as a reading lamp.

15 Digital Voltmeter using 8051 Microcontroller: This is a simple digital voltmeter circuit designed using 8051 microcontroller. This circuit measures the input voltage from 0V to 5V. Here, the input voltage should be DC voltage to get the accurate output on LCD.

16 Wireless Switch Circuit using CD4027: This is a simple circuit which needs no physical contact with the appliance. In this circuit, all you need is to pass your hand above LDR to ON or OFF the switch.

17 Water Level Indicator: This Water Level Indicator project employs a simple mechanism which helps to detect and indicate the water level in an overhead tank or any other water container. It can be used in Hotels, Factories, Homes Apartments, Commercial Complexes, Drainage, etc.

18 Water Level Alarm Using 555 Timer: This is a simple and low cost hardware project using a 555 timer circuit. The aim of this project is to design a water level detecting alarm with simple and low cost hardware without compromising on the performance of the device.

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19 Wailing Siren Circuit: The main principle of this circuit is to produce a wailing siren. The 555 timer IC is operated in astable mode. When the switch is pressed, speaker produces high pitch siren and when it is released, its pitch decreases and is switched off after 30 seconds.

20 Variable Voltage Power Supply from Fixed Voltage Regulator: This Voltage regulator circuit is used to get fixed voltage at the output without depending on the input voltage.

21 USB Mobile Charger Circuit: This circuit is useful in charging the mobiles through USB outlet present in our laptops and PCs. For the charging of your mobile phone, this circuit provides you a regulated voltage of 4.7 volts.

22 UP/DOWN Fading LED Lights: This is a simple up/down fading LED lights circuit which can be used in shopping malls, home and security applications."/>

23 Understanding 7805 IC Voltage Regulator: This is a circuit diagram of 7805 IC which is a 5v DC regulated IC. It is very flexible and is employed in many circuits like a voltage regulator.

24 555 Timer in Monostable and Astable Multivibrator Modes: Here is the detailed explanation along with circuit diagrams about how a 555 timer circuit works as an astable multivibrator and as a monostable multivibrator.

25 Unbiased Digital Dice with LEDs: This is a circuit diagram of digital dice which is nearly unbiased. By using this circuit, there is no chance to cheat as the circuit operates at such a high speed that the circuit is almost imperceptible to the human eye.

26 Ultrasonic Rangefinder using 8051: This circuit explains you how to measure the distance using 8051 microcontroller. This ultrasonic range finder system measures the distance up to 2.5 meters at accuracy of 1 cm.

27

TV Transmitter Circuit: The main principle of this circuit is to transmit the audio and video signals. Here

audio signals are frequency modulated and video signals are PAL modulated. These modulated signals are applied for the antenna.

28

TV Remote Control Jammer: This proposed TV jammer circuit confuses the infrared receiver in a TV by producing the constant signal that interferes the remote control signal. If you switch on the circuit once, the TV will not receive any command from the remote. This allows you to watch your own program without anyone changing the channel or volume.

29 Transistor Intercom Circuit: This transistor intercom circuit is a simple two way intercom circuit which is used for the dual purpose of sending as well as receiving signals.

30 Toy Organ using 555 Timer IC: This is the circuit diagram of simple Toy Piano using 555 Timer IC. It produces different tones or sounds depending on the frequency range.

31 Touch ON and OFF Switch Circuit: This Touch ON/OFF Switch circuit is more useful in such a way that we can automatically ON or OFF any switch by touching a device without moving from our place.

32 Temperature Controlled DC Fan using Microcontroller: The main principle of the circuit is to switch on the fan connected to DC motor when the temperature is greater than a threshold value.This can be used in home applications and in cpu to reduce heat.

33 Super Sensitive Intruder Alarm: This circuit is designed to alert the user when an intruder enters into the home. If there is any obstacle in front of IR sensor, it generates an interrupt signal. This interrupt signal is given to the speaker to alert the user.

34 Sun Tracking Solar Panel: This article describes about circuit that rotates solar panel. This Sun tracking solar panel consists of two LDRs, solar panel, stepper motor and ATMEGA8 Microcontroller.

35 Stun Gun Circuit: This Stun gun circuit is mostly used as a weapon to stun or send shock waves to the target with the intention to weaken or paralyze it.

36

Automatic Dusk to Dawn (Evening on to Morning Off) : This article describes about the circuit that switches the street lights on detecting vehicle movement and remains off after fixed time. This system controls the street lights using light dependent resistor and PIR sensor.

37 Stepper Motor Interfacing with 8051 Microcontroller: The main principle of this circuit is to rotate the stepper motor step wise at a particular step angle. The ULN2003 IC is used to drive the stepper motor as the controller cannot provide current required by the motor.

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38 SR Flip Flop with NAND and NOR Gates: SR Flip Flop, also known as SR latch is the most vital as well as broadly used Flip Flop. Get an idea about design of SR Flip Flop with NAND and NOR Gates.

39

Solar Battery Charger Circuit: Here is the simple circuit to charge 6V, 4.5Ah rechargeable Lead-acid battery from the solar panel. This solar charger has current and voltage regulation and also has over voltage cut off facilities. This circuit may also be used to charge any battery at constant voltage because output voltage is adjustable.

40 Simple LED Blinking Lights Circuit: Here is a best example for simple LED blinking ligts i.e. LED Flasher which blinks the LEDs in regular time period. This circuit can be used for decoration purpose or can be used for a signaling purpose and many more.

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Simple FM Radio Jammer Circuit: This is a Jammer circuit which is used to block the signals. Jammer circuit produces the high frequency signal which will confuse the receiver of particular system from receiving the signal, even though circuit is working properly, user of the system feels that circuit is not working properly.

42 Simple Fire Alarm Circuits: Here are two simple fire alarm circuits which are used to detect the fire automatically and inform to the people immediately with an alarm.

43 Audio Tone Control Circuit: This article explains you how to design an audio tone control circuit with the gain of around 25. This design needs less number of components and it is cost effective.

44

Security Alarm Circuit: This circuit helps you to guard your precious documents as well as jewellery from intruders or theft. All you need is to just place this circuit in front of the locker or below the mat so when any unknown person come and walk over the switch, the circuit will trigger and sound of alarm comes.

45

Remote Control Circuit through RF without microcontroller: Here we have used RF434 MHz

modules to make wireless remote. Using this remote, we can control the appliances within the range of 100 meters. It is used for remote control applications like burglar alarm, car door alarm, calling bell, security systems, etc.

46 RFID based Attendance System: This simple RFID based attendance system is designed using ATmega8 Microcontroller and is mainly used in educational institutions, industries, etc. where authentication is needed.

47 Reverse Parking Sensor Circuit: If you are a new driver then it is very difficult to judge the distance while parking the car. Reverse parking sensor circuit solves this problem by indicating the distance with the help of three LED’s. We can easily arrange this system at the back side of the car.

48 Remote Operated Spy Robot Circuit: This is a simple spy robot circuit which can be controlled by the remote. The maximum controllable range is 125 meters. It is used to observe the behavior of wild animals where human beings cannot reach.

49 Remote Operated Alarm Circuit: This circuit rings an alarm when you point a TV remote at it and press on any button. This can be used as a calling bell to call your assistant.

50 Reaction Timer Game Circuit: This is a simple and funny game circuit which contains 10 LEDs that are moving in an arbitrary fashion and we have to target a particular LED given by your challenger.

51 Rain Alarm Circuit: Rain water detector will detect the rain and make an alert; rain water detector is used in the irrigation field, home automation, communication, automobiles etc. Here is the simple and reliable circuit of rain water detector which can be constructed at low cost.

52 PWM LED Dimmer Using NE555: The Pulse Width Modulation (PWM) plays an important role in controlling the circuits. We use this PWM to dim the intensity of light of the LED.

53 PWM based DC Motor Speed Control using Microcontroller: Here is a simple DC Motor speed control circuit designed using AVR Microcontroller. Here we use a technique called PWM (pulse width modulation) to control the speed of DC motor.

54 Pull Pin Security Alarm System: This circuit helps us to get alerted when anybody picks our pockets or bags. The circuit is very helpful to prevent our goods getting pick pocketed.

55 Police Siren Circuit using NE555 Timer: This circuit produces a sound similar to the police siren. You may also get detailed information about pin diagram and internal block diagram of NE555 timer.

SNO Project Name

56 Police Lights using 555 Timer: This circuit simulates the police car lights by alternate flashing. This circuit flashes red LEDs for three times and blue LED’s for three times. This flashing action performs continuously. This circuit uses 555 timer and a decade counter.

57 Polarity cum Continuity Tester: With the help of this circuit, we can also identify whether the components we are using in our circuit are good or bad before mounting them on the PCB.

58 PIR Sensor Based Security Alarm: This article explains about PIR based security system in which PIR sensor is used instead of transmitter or receiver. This saves the power consumption and is low cost. This circuit can be used in the museums to protect the valuable things.

59 Panic Alarm: This panic alarm circuit helps us to intimate others regarding our bad situation without any delay. It is more useful when an intruder entering our house or bad health status at which we are unable to intimate to the people around us.

60 One Transistor Electronic Code Lock System: The main principle of this circuit is that the door lock opens only when the buttons are pressed in an order. The transistor and diode plays a main role in the circuit.

61 Multiplexer and Demultiplexer: A multiplexer is a circuit that accepts many inputs but gives only one output where as a demultiplexer accepts only one input and gives many outputs. Get an idea about their circuit diagram and pin diagrams in this post.

62 Motion Detector Circuit: The motion detector is not only used as intruder alarm but also used in many applications like home automation system, energy efficiency system, etc. The motion detector will detect the motion of the people or objects and give the appropriate output according to the circuit.

63 Morse Code Generator Circuit: This is a circuit used to generate morse code. Morse code is very old and versatile technique to send text messages using wireless media.

64 Monostable Multivibrator Circuit Operation: Here is the monostable multivibrator circuit diagram and working. Multivibrator is an electronic circuit which will work as two stage amplifier operating in both stable and astable mode.

65 Variable Power Supply and Charger: This is a circuit which helps to check or test your electronic projects and also to charge the Mobile phone batteries. This circuit can also work as an emergency light.

66 Mobile Jammer Circuit: This circuit is used to block the signals of cell phones with in the range of 100 meters. This circuit can be used in TV transmission and also for remote controlled toys or play things.

67 Mains Operated LED Light Circuit: This is a simple circuit which is more useful to save our resources, energy and money by installing in your homes.

68 Luggage Security Alarm: This is a simple alarm circuit which helps in ringing a warning alarm when someone tries to steal the luggage.

69 Low Power Audio Amplifier using 555 Timer: This is a simple low power audio amplification circuit designed using 555 timer. It can be used to develop low power music systems used in vehicles.

70 Line Following Robotic Circuit using ATMega8 Microcontroller: This line follower robot is a basic robot that follows a specific path indicated by a line having some particular width.

71 Light Activated Switch Circuit: The main principle of this circuit is to switch ON the light when the LDR is illuminated. This circuit can be used in security applications like when there is darkness on the LDR, it stops lighting.

72 LED Running Lights Circuit: This is a simple circuit consists of 9 LED lights in knight rider scanner mode. It will present an eye catching look as the LED initially travel in the one way and then travel reverse in the similar direction.

73 LED Lamp Dimmer Circuit: In this circuit, at the starting LED glows slowly, then grown brighter and once again slowly it became dim. The basis of the whole circuit is an operational amplifier IC named LM358.

74 LED Interfacing with 8051: The main principle of this circuit is to interface LEDs to the 8051 family micro controller. Commonly, used LEDs will have voltage drop of 1.7v and current of 10mA to glow at full intensity. This is applied through the output pin of the microcontroller.

75 3X3X3 LED Cube: This is a simple a simple LED cube circuit designed without using microcontroller. It

is based on the principle of driving LEDs using the clock pulses.

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76 LED Christmas Lights Circuit: This is a simple circuit used to decorate your house by building christmas lights using LEDs. The lights will get ON at night and OFF in morning time.

77 Lead Acid Battery Charger Circuit: Lead Battery is a rechargeable battery and is more useful in our real life as it will dissipate very little energy, it has very low energy to weight ratio, it can deliver high current, can work for long time with high efficiency and is very low cost.

78 LC Meter using 555 Timer: This is a simple LC Meter circuit designed using 555 Timer and 8051 microcontroller. It is mainly used to measure value of a reactive element like a capacitor or an inductor.

79 JK Flip Flop using CD4027: CD4027 is a JK flip flop that is generally used for data storing. Get an idea about how to build JK Flip Flop with CD4027.

80

IR Remote Control Switch: By using this circuit, we can control any house hold appliance with the help of remote. In this project, there are two parts – one is in transmitting section and the other is in receiving section. Receiving section will be in a stable position which is connected to any load and transmitter will act as a normal remote.

81 DC Motor Interfacing with 8051 Microcontroller: Here is a simple but very useful circuit in our real life named interfacing DC motor with 8051 microcontroller. It describes you how to control the DC motor using AT89C51 controller.

82 Interfacing 7 Segment Display to 8051: This article describes you how to interface seven segments to AT89C51 microcontroller. This system displays the digits from 0 to 9 continuously with a predefined delay.

83 Interfacing16X2 LCD with PIC Microcontroller: This is a circuit which helps in interfacing 16×2 LCD to PIC18F4550 microcontroller which is of family PIC18F.

84 Interfacing 16X2 LCD to AVR Microcontroller: This is a circuit which helps in interfacing 16X2 LCD

with AVR Microcontroller. The Atmega16 belongs to the AVR microcontroller family.

85 Interfacing 16x2 LCD with 8051: This is a simple circuit diagram which helps to describe interfacing of 16X2 LCD module to AT89C51which is a 8051 family microcontroller.

86

Intelligent Unambiguous Night Lamp Switcher: This is the circuit diagram of unambiguous night lamp switch, which turns ON our domestic lights automatically when it is dark, without human interference. It also avoids repeated frequent switching of the devices which is usually ignored in most similar circuits but may have a detrimental effect on our operating devices.

87 555 Timer IC Testing Circuit: This is a simple 555 IC testing-circuit which tests your entire 555 timer IC. So before using your IC, you may check whether your IC is good or bad by using this circuit.

88 Hot Water Geyser Controller Circuit: This circuit is made to turn OFF geysers as soon as our water gets hot and are ready for bathing.

89 High and Low Voltage Cutoff with Delay and Alarm: This high and low voltage cutoff with delay alarm circuit is an advanced automatic voltage stabilizer circuit and is used to protect our home appliances. It's cost is less as compared to voltage stabilizers.

90 Frequency Counter Circuit: Here we design a simple frequency counter system using two timers and two counters. While one of the Timer IC is used to produce clock signals, the other is used to produce the time limited signal of one second.

91 FM Transmitter Circuit: Here we built a wireless FM transmitter which uses RF communication to transmit the medium or low power FM signal. The maximum range of transmission is around 2 km.

92 FM Bugger Circuit: Here is small circuit with which you can listen to another people conversation from long distance using the normal FM radio set. This FM bugger circuit is kept in room where you want listen the conversation. You can listen to this conversation using the normal FM radio set.

93 Fire Alarm with Siren Sound: This circuit alerts us when there is a fire accident at home by ringing a siren sound instead of a buzzer.

94 Mosquito Repellent Circuit: Here is the simple electronic mosquito repellent circuit which can produce ultrasound in the frequency range of 20-38 kHz, which can scare away mosquitoes.

95 Electronic Letter Box: This is a simple circuit which helps in finding out any letter dropped in our box by stopping the LED lights attached in this circuit.

96 Dummy Alarm Circuit: The main principle of the circuit is to flash an LED for every 5 seconds. The

circuit consists of 7555 timer IC as main component.

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97 DTMF Based Home Automation System Circuit: This is a simple and very useful circuit in our real life named DTMF controlled home appliances system. It helps to control the home appliances using DTMF technology.

98 Ding Dong Sound Generator Circuit: This is ding dong sound generator circuit is designed using 555 timer IC in astable mode. It can be used as doorbell. With some modifications, it can be used to produce different sounds. Read this post for complete details.

99 Digital Voltmeter Circuit using ICL7107: Here we designed a analog to digital converter working as a digital voltmeter using a low power three and half digit A/D converter ICL7107 having internal 7 segment decoders, display drivers, a reference and a clock.

100 Digital Temperature Sensor: The main principle of this circuit is to display the digital temperature value. These are mainly used in environmental applications.

101 Digital Stopwatch Circuit: This is a simple circuit that displays count from 0 to 59, representing a 60 second time interval. It consists of a 555 timer to produce the clock pulses and two counter ICs to carry out the counting operation.

102 Basic Logic Gates Using NAND Gate: We are all well known that NOT, AND, OR are the basic logic gates. Here we have shown how to design these basic logic gates using one of the universal gates - NAND Gate.

103

Density Based Traffic Signal System using Microcontroller: In this system, we use IR sensors to measure the traffic density. We have to arrange one IR sensor for each road; these sensors always sense the traffic on that particular road. All these sensors are interfaced to the microcontroller. Based on these sensors, controller detects the traffic and controls the traffic system.

104

Curtain Opener/Closer Circuit: This circuit will open and close the curtain of your home and office just

by pushing a switch. So with the help of this unique circuit, we do not need to move from one place to open and close the curtain.

105 Continuity Tester with Melody: This circuit works as a continuity tester device which tests the continuity of the wire at hand. It is an indispensable tool to check broken wires and undesired shorting of wires.

106 Digital Tachometer using 8051 Microcontroller: Here we designed a simple non contact tachometer using microcontroller which can measure speed with an accuracy of 1 rev/sec.

107 Construction of Basic Logic Gates using NOR Gate: Here, we have shown how to construct the basic logic gates - NOT, AND, OR gates using NOR Gate which is one of the universal gates.

108 Clap Switch Circuit for Devices: This is another simple but very useful circuit which helps to ON or OFF a device without moving from you place and also helps to control the speed of the electric devices like fan, etc.

109 Celsius Scale Thermometer using AT89C51: This Celsius Scale Thermometer circuit is designed using at89c51 and lm35. This circuit works on analog to digital conversion principle. It can be used at homes, mobile places like cars to keep a track of the temperature.

110 Cell Phone Detector: This is a simple circuit which helps to detect the presence of an activated cell phone by detecting the signals in the frequency range of 0.9 to 3GHz. It helps in mobile phones tracking which are used for spying.

111 Car Battery Charger Circuit: This article aims to describe the principle of operation, design and working of a simple car battery charger from AC mains supply and a feedback control section to control the battery charging.

112

Boolean Algebra Calculator: This Boolean algebra calculator is an interesting project which is more useful in our real life by working as a portable calculator to simplify the Boolean expression on the fly. In our circuit, we use Boolean algebra simplification methods like the Quine-McCluskey algorithm to simplify the Boolean expression and display the output on the display.

113 Bipolar LED Driver Circuit: This bipolar LED driver circuit is very useful at the places where flashing of light is required, as in beacon flashing. This circuit can be mainly used for indication purposes.

114 Bike Turning Signal Circuit: The objective of this circuit is to indicate left or right turn for bike/vehicle. Two identical circuits are needed, one is for left and the other is for right. The main heart of this circuit is 555 timer.

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115 Bidirectional Visitor Counter using 8051: This Bidrectional Visitor Counter Circuit is helpful to count the number of persons entering or leaving a room and to display it on a screen.

116 7 Segment LED Display Decoder: This is the circuit diagram of display decoder which is used to convert a BCD or binary code into a 7 segment code used to operate a 7 segment LED display.

117 Battery Powered Portable Light: This circuit is more helpful in handling unexpected and undesired darkness in our homes or offices. It provides considerable amount of brightness required to do our daily tasks.

118 Battery Charger Circuit: This battery charger circuit works on the principle of controlling switching of an SCR based on charging and discharging of battery.

119 Auto Turnoff Soldering Iron Circuit: This circuit helps the soldering iron to turn off automatically when it detects overheating and thereby avoids it from getting damaged.

120 Auto Night Lamp using High Power LED: This Auto Night Lamp is an interesting circuit which helps to turn ON the LED lights interfaced to it at night time and it turns OFF the lights automatically when it is day.

121 Automatic Washroom Light Switch: This is a simple but very useful circuit in our real life which helps to automatically turn On the lights when a person enters the washroom and it automatically turns Off the lights when he leaves it.

122 Automatic Street Light Controller Circuit Using Relays and LDR: This circuit helps in automatically turn ON/OFF the street lights using relays and LDR. The whole circuit is based on IC CA3140.

123 Automatic Railway Gate Controller with High Speed Alerting System: The main aim of this project is to operate and control the unmanned railway gate in the proper manner in order to avoid the accidents in the unmanned railway crossing.

124 Automatic Plant Irrigation System: This project circuit is more useful in watering plants automatically without any human interference. It is more useful when the owner is not present in the home for few days.

125 Automatic LED Emergency Light Circuit: This is the simple and cost effective automatic emergency light circuit with light sensing. This system charges from main supply and gets activated when main supply is turned OFF. This emergency lamp will work for more than 8 hours.

126 Automatic Door Bell With Object Detection: This automatic doorbell with object detection circuit helps to sense the presence of a person or an object automatically and rings the doorbell.

127 Automatic Changeover Switch: This is a simple automatic changeover circuit in which DC load like a series of LEDs are driven either by a battery or an AC-DC power supply.

128 Automatic Battery Charger: This charger automatically shut off the charging process when battery attains full charge. This prevents the deep charge of the battery. If the battery voltage is below the 12V, then circuit automatically charges the battery.

129 Auto Intensity Control of Street Lights: This is a simple circuit that automatically controls the intensity of street lights which is designed using microcontroller and LEDs.

130 Audio Equalizer Circuit: The circuit is used to change the tune/melody into a different pitch level by devoid of loss in the tune. It is mainly useful to music lovers.

131 Air Flow Detector Circuit: This Air flow detector circuit can be used to detect the flow of air in areas like car engine. It can also be used as temperature detector.

132 9 Way Clap Switch Circuit: This circuit helps you to manage your appliances in your home by just clap without moving from your bed.

133 8 Channel Quiz Buzzer Circuit using Microcontroller: We built the circuit using a microcontroller which scans the input from push buttons and displays the corresponding number on a display device.

134 5 Channel IR Remote Control System using Microcontroller: This article is aimed to design and demonstrate a simple 5 channel remote control system to drive five loads. This circuit works on the principle of IR communication.

135 2 Digit Up Down Counter: The main principle of this circuit is to increment the values on seven segment displays by pressing the button. This circuit can be mainly used in scoreboards.

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136 230V LED Driver: Here we design a simple circuit driving a series of LED from 230V AC. This is accomplished using a capacitor based power supply. This is a low cost and efficient circuit and can be used at homes.

137 150W Power Amplifier Circuit: Here we designed a power amplifier circuit using push pull class AB configuration to derive a power of 150W to drive a load of 8 Ohms (speaker).

138 12v DC to 220v AC Converter Circuit: Here is a simple voltage driven inverter circuit which converts 12v DC signal to single phase 220v AC using power transistors as switching device.

139 12V to 24V DC Converter Circuit: This is another kind of circuit which helps to convert 12V DC current to 24V DC current.

140 100w Subwoofer Amplifier Circuit: Here is the circuit diagram and working of 100w subwoofer amplifier circuit. A Subwoofer is a loudspeaker which produces audio signals of low frequencies.

141 100W MOSFET Power Amplifier Circuit: A power amplifier circuit using MOSFET has been designed to produce 100W output to drive a load of about 8 Ohms.

142 Random Number Generator using 8051: This circuit helps to generate a random number in between 0 to 100 when push button is pressed and it may be used in the games like monopoly, snake ladder.

143 Delay using 8051 Timers

144 Automated Vehicle Identification and Toll-Pass System.

145 Automatic Exhaust Fan Control Coupled To Gas Leak Detection

146 Automatic Heat Detector

147 Automatic Light Beam Shifting Of Vehicles On High Ways

148 Automatic solar street light controller

149 Automatic Speed Regulation Depending On Incoming Vehicle On High Ways(Fuel Injection)

150 Autonomous Self-parking car

151 Ball Picker Robot

152 Beacon Flasher Using Microcontroller

153 Bidirectional Rotation of an Induction Motor with a Remote Control Device

154 Biopic Heartbeat Monitor

155 Blackout game

156 BLDC Motor Speed Control with RPM Display

157 Build A Carbon Monoxide SNIFFER

158 Build A Simple Infrared Illuminator

159 Build The Breath O-Meter

160 Built Your Own Multi-Frequency Digital Signal Generator

161 Burglar Alarm System

162 Cell Phone Based DTMF Controlled Garage Door Opening System

163 Cell phone controlled solar vehicle

164 Clap Switch

165 Co2 & O2 Monitoring In Green House

166 Coin Based Toll Gate System.

167 Colour Intensity Measurement (Liquids)

168 Colour Reflectance Measurement (Solids)

169 Condenser Mice Audio Amplifier

170 Data Logger

171 Dc Motor Control PWM Technique

172 DC Motor Direction Control

173 Density Based Traffic Signal System Using PIC Microcontroller

174 Depth Of The Medium Based On Attenuated Reflectance

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175 Depth Of The Medium/Liquid Level By Change In Conductance

176 Designing A Digital Thermometer By Using A Selected Temperature Sensor

177 Digital Alarm Clock

178 Digital Compass/Navigation

179 Digital Object Counter (5v)

180 Digital Panel Meter (5v)

181 Digital Receipts System

182 Discotheque Light Stroboscopic Flasher

183 Display of Dialed Telephone Numbers on Seven Segment Displays

184 DTMF Development Board

185 DTMF Proximity Detector

186 DTMF Telephone Remote Control

187 Dual Motor L298 H-Bridge Control

188 E2prom Based Data Entry Real Time Clock Control Application

189 Electric Etch

190 Electrical Equipment Controller

191 Electrical power generation system using railway track

192 Electrical power generation using foot steps

193 Electrical power generation using speed breaker

194 Electrical power generation using steam power plant

195 Electrical power generation using thermal power plant

196 Electricity and water pumping system using wind mill

197 Electronic Card Lock System

198 Electronic Eye Controlled Security System

199 Electronic Eye With Security System

200 Electronic Jam

201 Electronic security system

202 Electronic watchdog

203 ESD Foam Touch Controlled Brick Blaster

204 Eye Ball Control of Wheel Chair for Physical Handicapped person

205 Fart Intensity Detector

206 Fastest Finger First Indicator

207 Fastest Finger Press Quiz Buzzer

208 FET 4 Input Mixer (+/-9v)

209 Fire & Smoke Alarm System

210 Fluid Flow Measurement (Liquid)

211 Fluid Level Detection

212 Four Quadrant DC Motor Speed Control with Microcontroller

213 Gesture Recognition Based on Scratch Inputs

214 GPS Data Logger with Wireless Trigger

215 Heliostat (MP4)

216 Hidden Active Cell Phone Detector

217 High Voltage DC by Marx Generator Principles

218 Home Automation (Ac/Dc) Using Pc Interface

219 Home Automation Using Television Remote Control

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220 House security system

221 Hydro power plant (model)

222 I2cprotocol Based Real Time Clock Control Application

223 Incoming Phone Ring Light Flasher

224 Industrial Automation Data Acquisition System

225 Industrial Battery Charger by Thyristor Firing Angle Control

226 Industrial Power Control by Integral Cycle Switching without Generating Harmonics

227 Industrial Protection System Using Light Dependent Resistor

228 Infra Red Illuminator

229 Infrared Auto Switch

230 Infrared Card less Head Phone

231 Infrared Control For PC

232 Infrared Remote Control Timer

233 Infrared Toy Car Motor Controller

234 Intelligent Battery Charger

235 Intelligent Overhead Tank Water Level Indicator

236 Intelligent solar emergency light

237 Interfacing Color Sensor With Different Wave Lengths to Microcontroller

238 Interfacing IBM Key Board To Micro Controller

239 Invisible Broken Wire Detector

240 Ionizer Mains (230v Ac)

241 IRDA (Infra Red Data Communication Protocol Implementation

242 Knock Alarm

243 L293 H-Bridge Dc Motor Controller

244 Lamp Life Extender by ZVS (Zero Voltage Switching)

245 Laser Audio Transmitter

246 Laser Torch Based voice Transmitter and Receiver

247 Leaf Moisture Analyzer

248 LED Panel Meter

249 LED Sensor Keyboard

250 LED-Based Message Display

251 Life Cycle Testing of Electrical Loads by Down Counter

252 Light Sensing Robot

253 Light Sensitive Inductive Load Controller

254 Line Follower Robot

255 Line Following Robotic Vehicle Using Microcontroller

256 Line Telephone Share

257 Logic Analyzer

258 Long Duration Timer

259 Long Range FM Transmitter with Audio Modulation

260 Micro Controller Clock

261 Micro Controller To Ethernet Interface

262 Microcontroller Based Intelligent Glass Break Detector

263 Microcontroller based Scrolling Message Display

264 Mobile Cell Phone Charger

SNO Project Name

265 Mobile Phone Battery Charger

266 Modern House Automation (Ac/Dc) Using IR Communication

267 Multi functional wind mill

268 Multi sensor Data Transmission

269 Musical Touch Bell

270 NES emulator

271 Object Counter with 7 Segment Display

272 ODB-II Automotive data interface

273 Optimum Energy Management System

274 Over Voltage or Under Voltage Tripping Mechanism

275 Parallel Telephone Lines with Security System

276 Particulates Monitoring Using Light Beam Attenuation

277 PC Based Electrical Load Control

278 PC based solar car

279 PC Controlled Scrolling Message Display for Notice Board

280 PC To PC Laser Communication

281 Ph Controller

282 Phase Sequence Checker for Three Phase Supply

283 Portable Programmable Medication Reminder

284 POV display

285 Programmable Load Shedding Time Management for Utility Department

286 Programmable Synthesized Guitar

287 Quality FM Transmitter

288 Remote Control For Home Appliances

289 Remote Controlled Fan Regulator

290 Remote controlled solar car

291 Remote Jamming Device

292 RF Control Of Induction Motors And Other Industrial Loads

293 Rhythm Following Flashing Lights

294 Robot Control Using TV Remote

295 Robot Plotter

296 Season Based Automatic Streetlights Switching

297 Self-Adjusting Window Shade

298 Simple Code Lock

299 Simple Function Generator 12v

300 Sine Pulse Width Modulation (spwm)

301 Sinewave Generator

302 Six Channel Petrochemical Fire Monitoring And Control Station

303 Smooth Start of a Single Phase Induction Motor

304 SMS based solar pick and place robot

305 SMS Chatting Using RF

306 SMS controlled solar moving vehicle for industrial application

307 Snake arm Multiple PID motor controller

308 Solar agricultural water pumping system

309 Solar agricultural water pumping system with auto tracking

SNO Project Name

310 Solar air conditioner

311 Solar air cooler with auto tracking

312 Solar automated guided vehicle (solar agv)

313 Solar automated track guided vehicle (solar atgv)

314 Solar automatic cell phone charger with pay system

315 Solar automatic traffic and street light controller

316 Solar Battery Charger And Shunt Regulator

317 Solar car (running model)

318 Solar cycle

319 Solar electric go bed drive

320 Solar electric two wheeler with rechargeable battery

321 Solar emergency lighting system with battery charger

322 Solar fan with lighting system

323 Solar intelligent vehicle (car model)

324 Solar irrigation system

325 Solar lighting system

326 Solar lighting system with auto tracking

327 Solar lighting with auto changeover system

328 Solar power generation with auto tracking

329 Solar powered accident prevented for train

330 Solar powered automatic head light dim/bright controller

331 Solar powered automatic railway gate controller

332 Solar powered automatic rain operated wiper

333 Solar powered automatic temperature controller with cooling system

334 Solar powered automatic vehicle accident information system

335 Solar powered fire fighting with visitor guided vehicle

336 Solar powered path finding robot

337 Solar powered remote controlled bomb detecting robot

338 Solar powered remote operated weapon system

339 Solar powered unaided guided vehicle (solar ugv)

340 Solar powered visitor guided with material handling vehicle

341 Solar powered voice controlled vehicle

342 Solar race car

343 Solar railway track crack detecting vehicle

344 Solar remote controlled video analyzing pick and place vehicle

345 Solar ups with auto tracking

346 Solar wheel chair for physically disabled

347 Speed Checker to Detect Rash Driving on Highways

348 Stamp Value Calculator for Postage Needs

349 Step Up 6 Volt DC to 10 Volt DC Using 555 Timer

350 Stepper Motor Based Valve Controller

351 Stepper Motor Control Using Microcontroller

352 Street Light that Glows on Detecting Vehicle Movement

353 Sun Tracking Solar Panel

354 Telephone Call Counter

SNO Project Name

355 Telephone Number Display

356 Telephone Receiver

357 Temperature Controlled Soldering Station

358 Thermistor Based Temperature Control

359 Three Phase Solid State Relay with ZVS

360 Thyristor Controlled Power for Induction Motor

361 Thyristor Power Control by IR Remote

362 Time Delay Based Relay Operated Load

363 Tissue Impedance Digital Biopsy

364 Touch Controlled Load Switch

365 Touch Dimmer

366 Touchpad/Infrared Music Synthesizer

367 Traction control system

368 U.S.B. Connectivity To Micro Controller

369 UNIPOLAR 4-Phase Stepper Motor Controller Board

370 Using TV Remote as a Cordless Mouse for the Computer

371 Variable Auxiliary Power Supply

372 Video Activated Relay to Control the Load

373 Voice Tuner

374 Water turbine power generation system

375 Weather Canvas

376 Wind mill power generation system

377 Wind turbine power generation system

378 Wire Loop Breaking Alarm Signal

379 Wireless Audio Transmitter for TV

380 Wireless music player

381 Wireless Vehicle Path Tracer Using IR & RF