PageOne

SMART PRO LATEST PROJECT IDEAS

SmartProjects - An idea to Product .

SCHOOL/MINI PROJECT IDEAS


SC500 - Ant sleep Alarm For Students
SC501 - Auto Reset Over/ Under Voltage Cut- Out
SC502 - Auto Turn-Off Battery Charger
SC503 - Automated Alarm Circuits
SC504 - Automatic Emergency Light
SC505 - Automatic Emergency Torch
SC506 - Automatic Night Lamp With Morning Alarm
SC507 - Automatic Phase Changer
SC508 - Automatic Room Power Controller
SC509 - Automatic Speed-Controller For Fans And Coolers
SC510 - Automatic Temperature Controlled Fan
SC511 - Automatic-Off Timer For Cd Players
SC512 - Blown Fuse Indicator
SC513 - Clap Remote
SC514 - Clap Switch
SC515 - Constant-Current Battery Charger
SC516 - Contactless Ac Mains Voltage Detector
SC517 - Digital Speedometer
SC518 - Drinking Water Alarm
SC519 - Economical Pump Controller
SC520 - Electrical Equipment Control Using Pc
SC521 - Four-Stage Fm Transmitter
SC522 - Fuel Reserve Indicator For Vehicles
SC523 - Fluid Level Detector
SC524 - GAS Leakage ALARM
SC525 - Generator Room Light
SC526 - Heat-Sensitive Switch
SC527 - Laptop Protector
SC528 - Laser Communication System
SC529 - Laser Torch-Based Voice Transmitter And Receiver
SC530 - Laser- Guided Door Opener
SC531 - Led Voltmeter
SC532 - Mini UPS
SC533 - Long - Range Fm Transmitter
SC534 - Low Current, High Voltage Power Supply
SC535 - Magnetic Proximity Switch
SC536 - Mains Manager
SC537 - Midnight Security Light
SC538 - Remote-Controlled Fan Regulator
SC539 - Non-Contact Power Monitor
SC540 - Precision Digital Ac Power Controller
SC541 - Ups For Cordless Telephones
SC542 - Seismic Sensor
SC543 - Voltage-Based Controller For Switches
SC544 - Servo Motor Tester
SC545 - Ramp Controlled Light
SC546 - Smart Phone Light
SC547 - Telephone Conversation Recorder
SC548 - Staircase Light With Auto Switch-Off
SC549 - Speed Control Of Dc Motor Using Pulse-Width Modulation
SC550 - Smart Exhaust Fan Switch
SC551 - Programmable Timer For Appliances
SC552 - Speed Control Of Dc Motor Using Pulse-Width Modulation
SC553 - Pc-Based Dc Motor Speed Controller
SC554 - Wireless Motor Control Through RF

Abstracts

Ant sleep Alarm For Students
This Project saves both time and electricity for students. It helps to prevent them from dozing off while studying, by sounding a beep at a fixed time interval, say, 30 minutes. If the student is awake during the beep, he can reset the circuit to beep in the next 30 minutes. If the timer is not reset during this time, it means the student is in deep sleep or not in the room, and the circuit switches off the light and fan in the room, thus preventing the wastage of electricity.

Back to Top

Auto Reset Over/ Under Voltage Cut- Out
This over/under voltage cut-out will save your costly electrical and electronic appliances from the adverse effects of very high and very low mains voltages.

Back to Top

Auto Turn-Off Battery Charger
This charger for series-connected 4-cell AA batteries automatically disconnects from mains to stop charging when the batteries are fully charged. It can be used to charge partially discharged cells as well. The circuit is simple and can be divided into AC-to-DC converter, relay driver and charging sections.

Back to Top

Automated Alarm Circuits
Two alarm circuits are presented here. One produces bird-chirping sound and the other British police siren tone.

Back to Top

Abstracts

Automatic Emergency Light
This emergency light has the following two advantages: 1. It turns on automatically when the mains power fails, so you need not search it in the dark. 2. Its battery starts charging as soon as the mains resumes.

Back to Top

Automatic Emergency Torch
Its main features are: 1. Very reliable operation. 2. As transformer is not used, it is compact and cost-effective. 3. The torch bulb glows automatically at power off and goes out on restoration of power. 4. Since Ni-Cd battery is used, no maintenance is required.

Back to Top

Automatic Night Lamp With Morning Alarm
This circuit automatically turns on a night lamp when bedroom light is switched off. The lamp remains ‘on’ until the light sensor senses daylight in the morning. A super-bright white LED is used as the night lamp. It gives bright and cool light in the room. When the sensor detects the daylight in the morning, a melodious morning alarm sounds.

Back to Top

Automatic Phase Changer
In three-phase applications, if low voltage is available in any one or two phases, and you want your equipment to work on normal voltage, this circuit will solve your problem. However, a proper-rating fuse needs to be used in the input lines (R, Y and B) of each phase. The circuit provides correct voltage in the same power supply lines through relays from the other phase where correct voltage is available. Using it you can operate all your equipment even when correct voltage is available on a single phase in the building.

Back to Top

Abstracts

Automatic Room Power Controller
An ordinary automatic room power control circuit has only one light sensor. So when a person enters, the room it gets one pulse and the lights come ‘on.’ When the person goes out it gets another pulse and the lights go ‘off.’ But what happens when two persons enter the room, one after the other? It gets two pulses and the lights remain in ‘off’ state. The circuit described here overcomes the above-mentioned problem. It has a small memory which enables it to automatically switch ‘on’ and switch ‘off’ the lights in a desired fashion. The circuit uses two LDRs which are placed one after another (separated by a distance of say half a meter) so that they may separately sense a person going into the room or coming out of the room.

Back to Top

Automatic Speed-Controller For Fans And Coolers
During summer nights, the temperature is initially quite high. As time passes, the temperature starts dropping. Also, after a person falls asleep, the metabolic rate of one’s body decreases. Thus, initially the fan/cooler needs to be run at full speed. As time passes, one has to get up again and again to adjust the speed of the fan or the cooler. The device presented here makes the fan run at full speed for a predetermined time. The speed is decreased to medium after some time, and to slow later on. After a period of about eight hours, the fan/cooler is switched off.

Back to Top

Automatic Temperature Controlled Fan
Here is a circuit through which the speed of a fan can be linearly controlled automatically, depending on the room temperature. The circuit is highly efficient as it uses thyristor for power control. Alternatively, the same circuit can be used for automatic temperature controlled AC power control.

Back to Top

On Automatic-Off Timer For Cd Players
A re you in the habit of falling asleep while listening to music? If yes, you’ll love this circuit. It will automatically start functioning when you switch off your bedroom light and shall turn your CD player ‘off’ after a predetermined time. In the presence of ambient light, or when you switch on light of the room in the morning, the CD player will again start playing. Unlike the usual timers, you don’t have to set this timer before sleeping. The circuit derives its power directly from the bridge rectifiers. When ‘on’/‘off’ switch S1 is closed, LED1 glows to indicate that the circuit is powered ‘on.’

Back to Top

Abstracts

Blown Fuse Indicator
Generally, when equipment indicates no power, the cause may be just a blown fuse. Here is a circuit that shows the condition of fuse through LEDs. This compact circuit is very useful and reliable. It uses very few components, which makes it inexpensive too.

Back to Top

Clap Remote
An infra-red or wireless remote control has the disadvantage that the small, handy, remote (transmitter) is often misplaced. The sound operated switch has the advantage that the transmitter is always with you. This project offers a way to control up to four latching switches with two claps of your hand. These switches may be used to control lights or fans—or anything else that does not produce too loud a sound.

Back to Top

Clap Switch
Here’s a clap switch free from false triggering. To turn on/off any appliance, you just have to clap twice. The circuit changes its output state only when you clap twice within the set time period. Here, you’ve to clap within 3 seconds.

Back to Top

Constant-Current Battery Charger
There are many ways of battery charging but constant-current charging, in particular, is a popular method for lead-acid and Ni-Cd batteries. In this circuit, the battery is charged with a constant current that is generally one-tenth of the battery capacity in ampere-hours. So for a 4.5Ah battery, constant charging current would be 450 mA.

Back to Top

Abstracts

Contactless Ac Mains Voltage Detector
This is a CMOS IC (CD4033) based circuit which can be used to detect presence of AC mains voltage without any electrical contact with the conductor carrying AC current/voltage. Thus it can be used to detect mains AC voltage without removing the insulation from the conductor. Just take it in the vicinity of the conductor and it would detect presence of AC voltage.

Back to Top

Digital Speedometer
This instrument displays the speed of the vehicle in kmph. An opaque disc is mounted on the spindle attached to the front wheel of the vehicle. The disc has ten equidistant holes on its periphery. On one side of the disc an infrared LED is fixed and on the opposite side of the disc, in line with the IR LED, a phototransistor is mounted. IC LM324 is wired as a comparator.

Back to Top

Drinking Water Alarm
The State Boards supply water for limited duration in a day. Time of water supply is decided by the management and the public does not know the same. In such a situation, this water alarm circuit will save the people from long wait as it will inform them as soon as the water supply starts.

Back to Top

Economical Pump Controller
The automatic pump controller eliminates the need for any manual switching of pumps installed for the purpose of pumping water from a reservoir to an overhead tank . It automatically switches on the pump when the water level in the tank falls below a certain low level L), provided the water level in the reservoir is above a certain level (R). Subsequently, as the water level in the lank rises to an upper level (M) , the pump is switched off automatically. The pump is turned on again only when the water level again falls below level L in the tank, provided the level in the reservoir is above R. This automated action continues.

Back to Top

Abstracts

Electrical Equipment Control Using Pc
Here is a novel idea for using the printer port of a PC, for control application using software and some interface hardware. The interface circuit along with the given software can be used with the printer port of any PC for controlling up to eight equipment.

Back to Top

Four-Stage Fm Transmitter
This FM transmitter circuit uses four radio frequency stages: a VHF oscillator built around transistor BF494 (T1), a preamplifier built around transistor BF200 (T2), a driver built around transistor 2N2219 (T3) and a power amplifier built around transistor 2N3866 (T4). A condenser microphone is connected at the input of the oscillator.

Back to Top

Fuel Reserve Indicator For Vehicles
Here is a simple circuit for monitoring the fuel level in vehicles. It gives an audiovisual indication when the fuel level drops alarmingly below the reserve level, helping you to avoid running out of petrol on the way. Nowadays vehicles come with a dash-mounted fuel gauge meter that indicates the fuel levels on an analogue display. The ‘reserve’ level is indicated by a red marking in some vehicles, but the needle movement through the red marking may be confusing and not precise. This circuit monitors the fuel tank below the reserve level and warns through LED indicators and audible beeps when the danger level is approaching.

Back to Top

Fluid Level Detector
Here is a simple but versatile circuit of fluid level detector which can be used for various applications at home and in industry.

Back to Top

GAS Leakage ALARM
LPG gas is supplied in pressurized steel cylinders. As this gas is heavier than air, when it leaks from a cylinder it flows along floor and tends to settle in low spots such as a basement. This can cause fire or suffocation if not dealt with. Here is a circuit that detects the leakage of LPG gas and alerts the user through audio-visual indications.

Back to Top

Abstracts

Generator Room Light
At night when power fails, one finds it difficult to reach the generator to start it. Here is the circuit for a generator room light that automatically turns on at night, facilitating easy access to the generator. During daytime, the light remains off.

Back to Top

Heat-Sensitive Switch
At the heart of this heat-sensitive switch is IC LM35 (IC1), which is a linear temperature sensor and linear temperature-to-voltage converter circuit.

Back to Top

Laptop Protector
Protect your valuable laptop against theft using this miniature alarm generator. Fixed inside the laptop case, it will sound a loud alarm when someone tries to take the laptop. This highly sensitive circuit uses a homemade tilt switch to activate the alarm through tilting of the laptop case.

Back to Top

Laser Communication System
This laser communication system transmits sound or music signals through a laser beam. The intensity of the laser beam changes with the amplitude of the sound signal. The variation in the intensity of the laser beam is converted into a variation in the voltage level by using a calculators solar panel.

Back to Top

Abstracts

Laser Torch-Based Voice Transmitter And Receiver
Using this circuit you can communicate with your neighbors wirelessly. Instead of RF signals, light from a laser torch is used as the carrier in the circuit. The laser torch can transmit light up to a distance of about 500 meters. The phototransistor of the receiver must be accurately oriented towards the laser beam from the torch.

Back to Top

Laser- Guided Door Opener
This automatic door opener can be made using readily available components. The electromagnetic relay at the output of this gadget can be used to control the DC/AC door-opener motor/solenoid of an electromechanical door opener assembly, with slight intervention in its electrical wiring.

Back to Top

Led Voltmeter
Four µ741 op-amps are used here to measure the voltage ranging from 3V to 12V DC. The voltage measured is displayed on eight LEDs.

Back to Top

Mini UPS
This circuit provides an uninterrupted power supply (UPS) to operate 12V, 9V and 5V DC-powered instruments at up to 1A current. The backup battery takes up the load without spikes or delay when the mains power gets interrupted. It can also be used as a work bench power supply that provides 12V, 9V and 5V operating voltages. The circuit immediately disconnects the load when the battery voltage reduces to 10.5V to prevent deep discharge of the battery. LED1 indication is provided to show the full charge voltage level of the battery. Miniature white LEDs (LED2 and LED3) are used as emergency lamps during power failure at night.

Back to Top

Abstracts

Long - Range Fm Transmitter
Several circuits for constructing FM transmitters has power output of most of these circuits were very low because no power amplifier stages were incorporated. The transmitter circuit described here has an extra RF power amplifier stage, after the oscillator stage, to raise the power output to 200-250 milli watts. With a good matching 50-ohm ground—plane antenna or multi-element Yagi antenna, this transmitter can provide reasonably good signal strength up to a distance of about 2 kilometres.

Back to Top

Low Current, High Voltage Power Supply
A high voltage power supply is a very useful source which can be effectively used in many applications like biasing of gas-discharge tubes and radiation detectors etc. Such a power supply could also be used for protection of property by charging of fences. Here the current requirement is of the order of a few micro amps. In such an application, high voltage would essentially exist between a ‘live’ wire and ground. When this ‘live’ wire is touched, the discharge occurs via body resistance and it gives a non-lethal but deterrent shock to an intruder.

Back to Top

Magnetic Proximity Switch
Here is an interesting circuit for a magnetic proximity switch which can be used in various applications. The circuit, consists of a reed switch at its heart. When a magnet is brought in the vicinity of the sensor (reed switch), its contacts close to control the rest of the switching circuit. In place of the reed switch, one may, as well, use a general-purpose electromagnetic reed relay (by making use of the reed switch contacts) as the sensor, if required. These tiny reed relays are easily available as they are widely used in telecom products. The reed switch or relay to be used with this circuit should be the ‘normally open’ type.

Back to Top

Mains Manager
Very often we forget to switch off the peripherals like monitor, scanner, and printer while switching off our PC. The problem is that there are separate power switches to turn the peripherals off. Here is a mains manager circuit that allows you to turn all the equipment on or off by just operating the switch on any one of the devices; for example, when you switch off your PC, the monitor as well as other equipment will get powered down automatically.

Back to Top

Abstracts

Midnight Security Light
Most thefts happen after midnight hours when people enter the second phase of sleep called 'paradoxical' sleep. Here is an energy-saving circuit that causes the thieves to abort the theft attempt by lighting up the possible sites of intrusion (such as kitchen or backyard of your house) at around 1:00 am. It automatically resets in the morning.

Back to Top

Remote-Controlled Fan Regulator
Using this circuit, you can change the speed of the fan from your couch or bed. Infrared receiver module TSOP1738 is used to receive the infrared signal transmitted by remote control.

Back to Top

Non-Contact Power Monitor
Here is a simple non-contact AC power monitor for home appliances and laboratory equipment that should remain continuously switched-on. A fuse failure or power breakdown in the equipment going unnoticed may cause irreparable loss. The monitor sounds an alarm on detecting power failure to the equipment.

Back to Top

Precision Digital Ac Power Controller
SCRs and Triacs are extensively used in modern electronic power controllers—in which power is controlled by means of phase angle variation of the conduction period. Controlling the phase angle can be made simple and easy if we set different firing times corresponding to different firing angles. The design given here is a synchronized programmable timer which achieves this objective.”

Back to Top

Abstracts

Ups For Cordless Telephones
Cordless telephones are very popular nowadays. But they have a major drawback, i.e. they cannot be operated during power failure. Therefore usually another ordinary telephone is connected in parallel to the cordless telephone. This results in lack of secrecy. UPS is a permanent solution to this problem.

Back to Top

Seismic Sensor
This circuit simulates a seismic sensor to detect vibrations/sounds. It is very sensitive and can detect vibrations caused by the movement of animals or human beings. So it can be used to monitor protected areas to restrict entry of unwanted persons or animals.

Back to Top

Voltage-Based Controller For Switches
Here’s a simple circuit for controlling four switches from a distance through just a pair of wires.

Back to Top

Servo Motor Tester
When using a servo motor in a project, if the servo motor does not respond as per the input, how to make sure that the fault is not in the servo motor but the circuit or logic? One way is to isolate the servo motor from the circuit and check its proper working by feeding it pulses of varying width and checking the angle that the servo motor turns to. For example, a 1.5ms pulse should make the motor turn to a 90-degree position (neutral position). The circuit presented here generates pulses of varying widths.

Back to Top

Abstracts

Ramp Controlled Light
The circuit described here can be used for controlling a decorative lamp from zero intensity to maximum intensity in a specified time. Typical applications are for controlling Christmas lamps and serial lamp sets etc. The brightness of the lamps is controlled by a continuously running ramp voltage generated by a timer.

Back to Top

Smart Phone Light
The circuit shown here is used to switch on a lamp when the telephone rings, provided that the ambient light is insufficient.

Back to Top

Telephone Conversation Recorder
This circuit enables automatic switching-on of the tape recorder when the handset is lifted. The tape recorder gets switched off when the handset is replaced. The signals are suitably attenuated to a level at which they can be recorded using the 'MIC-IN' socket of the tape recorder.

Back to Top

Staircase Light With Auto Switch-Off
We are all familiar with the electrical wiring arrangement that connects an electrical bulb with two switches: one at the bottom of a staircase and the other at the top. Wiring is done such that either of the two switches can be used to switch the bulb on or off. In such a wiring arrangement, while climbing up the staircase which is in dark, the switch located at the bottom of the staircase is used to switch on the light. After you have climbed the staircase, you use the switch located there to switch off the light. The circuit presented here is an electronic-cum-electrical arrangement to get a similar facility as provided by the hard-wired electrical system.

Back to Top

Speed Control Of Dc Motor Using Pulse-Width Modulation
Pulse-width modulation (PWM) or duty-cycle variation methods are commonly used in speed control of DC motors. The duty cycle is defined as the percentage of digital ‘high’ to digital ‘low’ plus digital ‘high’ pulse-width during a PWM period.

Back to Top

Washing Machine Motor Controller
Washing machines usually employ a single-phase motor. In semi-automatic washing machines, a purely mechanical switch controls the timing and direction of the motor. These switches are costly and wear out easily.

Back to Top

Smart Laptop Docking Station
You can easily convert your ordinary docking station into a smart electronic laptop docking station with anti theft alarm. The add-on sensor circuit required for this is built around IC CNY70 (IC1) and IC CD4060 (IC2) as shown in Fig. 1. IC CNY70 is an integrated reflective-type opto-sensor that contains a photo transistor and an infrared LED. The LED emits infrared light and the transistor works as a receiver. The current flowing through the photo transistor depends on the intensity of the light detected.

Back to Top

Smart Exhaust Fan Switch
Exhaust fans in washrooms can be connected to the lighting circuit so that these switch on and switch off with the electric light. But as washrooms are sometimes used only for washing the face or hands, it is not always necessary to switch on the exhaust fan with the light. Advanced techniques such as humidity sensor switching and PIR motion sensor switching can also be used to control exhaust fans but these are not affordable for everyone. The simple exhaust fan circuit presented here automatically determines whether there is really a need to start the fan and reacts appropriately.

Back to Top

Programmable Timer For Appliances
This programmable timer is useful for domestic, commercial as well as industrial applications. It automatically turns the appliance on/off after a preset time. The time period can be varied from 8 seconds to 2 hours with the help of rotary switches S2 and S3. The circuit works in two modes: off mode and cyclic mode. Slide switch S4 is used for mode selection.

Back to Top

Pc-Based Dc Motor Speed Controller
This circuit allows you to control the speed of a DC motor (in eight levels) from your PC’s parallel port. The PC uses a software program to control the speed of the motor.

Back to Top

Wireless Motor Control Through RF
Motor control through RF communication is a very interesting application and is widely used in robotics, electronics toys, automation systems etc. This topic covers the way DC motors can be driven by using the controls from a distant place. The controls are transferred from one end to another by employing an RF module. The remote control application of RF has been extended to operate a motor driver which in turn controls the direction of motors.

Back to Top