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.
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.
Cell Phone Controlled Robotic
Vehicle: This is simple DTMF based Cellphone controlled robotic vehicle circuit
without using microcontroller. It can be used in industries and surveillance
systems.
Human Detection Robot using 8051
Microcontroller: The main principle of the circuit is to detect the human using
human detection sensor. The wireless robot is operated manually using PC. The
wireless technology used here is Radio Frequency technology. The data is
transmitted to receiver through RF.
SMS Controlled Robot: GSM
controlled robot or SMS controlled robot is a wireless robot which performs the
necessary actions by receiving a set of instructions in the form a Short
Message Service (SMS).
Remote Password Operated
Electronic Home Appliances: This circuit explains you how to control the
electrical appliances using an Android device. Here, Bluetooth module is
interfaced to 8051 microcontroller. This Bluetooth receives the commands from
the Android application device using wireless communication.
Metal Detector Robotic Vehicle: Land
mines buried under the ground causes threat to the lives and affect the economy
of the nation. Detection and removing of these mines manually is a dangerous
task. So, we use a metal detection robot which works on RF technology.
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.
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.
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.
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.
Password based Circuit Breaker: This
password based circuit breaker project is built using 8051 controller and is
used to switch off the power supply to the line by entering a password.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Simple 100W Inverter Circuit: This
is a small Inverter circuit which converts the direct current (DC) to
alternating current (AC).
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.
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.
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.
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.
LED Flasher Circuit: LED Flasher
is a simple circuit which will blink 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.
Dancing Bi-Color LED Lights
Circuit: Generally we use small voltage bulbs in the dancing bulbs. This
circuit is mainly used in the occasions, decoration articles or in visual
indication sign boards etc. In this project, we use bi-color LEDs for
sequential running light.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Battery Charger Circuit: This
battery charger circuit works on the principle of controlling switching of an
SCR based on charging and discharging of battery.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Street Lights that Glow on
Detecting Vehicle Movement: 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.
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.
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.
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.
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.
Luggage Security Alarm: This is a
simple alarm circuit which helps in ringing a warning alarm when someone tries
to steal the luggage.
9 Way Clap Switch Circuit: This
circuit helps you to manage your appliances in your home by just clap without
moving from your bed.
12V to 24V DC Converter Circuit:
This is another kind of circuit which helps to convert 12V DC current to 24V DC
current.
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.
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.
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.
Interfacing16X2 LCD with PIC
Microcontroller: This is a circuit which helps in interfacing 16×2 LCD to
PIC18F4550 microcontroller which is of family PIC18F.
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.
555 Timer in Monostable
Multivibrator Mode: The circuit is triggered by a falling edge, that is, by a
sudden transition from HIGH to LOW. The trigger pulse, produced by pressing the
button, must be of shorter duration than the intended output pulse.
555 Timer as an Astable
Multivibrator: In this circuit, There are three resistors named R inside it and
all have equal values. These form a voltage divider having reference voltages
of 1/3 and 2/3 of Vcc (the power supply). The logic state of the flip flop is
controlled by the reference voltage which is given to one of the inputs of both
two comparators.
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.
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.
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.
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.
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.
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.
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).
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.
Digital Temperature Sensor: The main principle of this
circuit is to display the digital temperature value. These are mainly used in
environmental applications.
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.
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.
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.
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.
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
.
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.
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.
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.
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.
