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05-03-2011, 12:06 PM
Post: #1
Antisleep Alarm for Students

.docx  project report.docx (Size: 782.3 KB / Downloads: 684)
Antisleep Alarm for Students
Introduction

While actually giving in to our body’s natural wants such as sleep, we’re keeping the balance beam in an upright and neutral position — generally a good thing to do. But life comes and calls quite often, many times forcing us to put hunger, drowsiness, and other basic human needs on the back burner in order to seal the deal and get the job done.
So here’s the scenario, you’re sitting in your car getting ready for a big meeting that if completed will net your company nice little multi-billion dollar deal. You’re supposed to be going over your notes and preparing yourself for this staple achievement. But instead, you find yourself doing the whole bobble head thing, getting dangerously to the steering wheel with each and every bob. If only there were something to keep you awake…
This circuit 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.
Students: Maybe they forgot the exam was tomorrow, maybe they were out partying, or maybe they just waited until the last minute. In any case, college students always have the need to burn the midnight oil. The problem is that it is extremely easy to fall asleep in the midst of studying and before you know it, morning has come and the exam is already over or you still haven't learned the material. If you don't want that to happen, then keep this reliable anti sleep alarm at your side.
CHAPTER- 2
Circuit description

This circuit 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
2.2 Circuitry
Things Needed for Making this Antisleep Alarm for Students
• Relay
• Bulb
• Transistor or SCR
• Push to ON /OFF switches
• Resistance & capacitor
• Pizzo buzzer
• Doide
• IC: IC CD4020
The circuit is built around Schmitt trigger NAND gate IC CD4093 (IC1), timer IC CD4020 (IC2), transistors BC547, relay RL1 and buzzer. The Schmitt-trigger NAND gate (IC1) is configured as an astable multivibrator to generate clock for the timer (IC2). The time period can be calculated as T=1.38×R×C. If R=R1+VR1=15 kilo-ohms and C=C2=10 μF, you’ll get ‘T’ as 0.21 second. Timer IC CD4020 (IC2) is a 14-stage ripple counter.
Around half an hour after the reset of IC1, transistors T1, T2 and T3 drive the buzzer to sound an intermediate beep. If IC2 is not reset through S1 at that time, around one minute later the output of gate N4 goes high and transistor T4 conducts. As the output of gate N4 is connected to the clock input (pin 10) of IC2 through diode D3, further counting stops and relay RL1 energises to deactivate all the appliances. This state changes only when IC1 is reset by pressing switch S1.
Assemble the circuit on a generalpurpose PCB and enclose it in a suitable
cabinet. Mount switch S1 and the buzzer on the front panel and the relay
at the back side of the box. Place the 12V battery in the cabinet for powering
the circuit. In place of the battery, you can also use a 12V DC adaptor.
CHAPTER- 3
Relay
3.1 Introduction

A relay is an electrically operated switch. Many relays use an electromagnet to operate a switching mechanism mechanically, but other operating principles are also used. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits, repeating the signal coming in from one circuit and re-transmitting it to another. Relays were used extensively in telephone exchanges and early computers to perform logical operations.
3.2 Working
A type of relay that can handle the high power required to directly drive an electric motor is called a contractor. Solid-state relays control power circuits with no moving parts, instead using a semiconductor device to perform switching. Relays with calibrated operating characteristics and sometimes multiple operating coils are used to protect electrical circuits from overload or faults; in modern electric power systems these functions are performed by digital instruments still called "protective relays".
CHAPTER- 4
Transistor

A transistor is a semiconductor device used to amplify and switch electronic signals. It is made of a solid piece of semiconductor material, with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor's terminals changes the current flowing through another pair of terminals. Because the controlled (output) power can be much more than the controlling (input) power, the transistor provides amplification of a signal. Today, some transistors are packaged individually, but many more are found embedded in integrated circuits.
The transistor is the fundamental building block of modern electronic devices, and is ubiquitous in modern electronic systems. Following its release in the early 1950s the transistor revolutionised the field of electronics, and paved the way for smaller and cheaper radios, calculators, and computers, amongst other things.
A bipolar (junction) transistor (BJT) is a three-terminal electronic device constructed of doped semiconductor material and may be used in amplifying or switching applications. Bipolar transistors are so named because their operation involves both electrons and holes. Charge flow in a BJT is due to bidirectional diffusion of charge carriers across a junction between two regions of different charge concentrations. This mode of operation is contrasted with unipolar transistors, such as field-effect transistors, in which only one carrier type is involved in charge flow due to drift. By design, most of the BJT collector current is due to the flow of charges injected from a high-concentration emitter into the base where they are minority carriers that diffuse toward the collector, and so BJTs are classified as minority-carrier devices.
21-06-2011, 11:43 AM
Post: #2
RE: Antisleep Alarm for Students

.docx  The Alert Master Project Report.docx (Size: 589.87 KB / Downloads: 238)
Chapter: 1 Introduction
 While actually giving in to our body’s natural wants such as sleep, we’re keeping the balance beam in an upright and neutral position — generally a good thing to do. But life comes and calls quite often, many times forcing us to put hunger, drowsiness, and other basic human needs on the back burner in order to seal the deal and get the job done.
 So here’s the scenario, you’re sitting in your car getting ready for a big meeting that if completed will net your company nice little multi-billion dollar deal. You’re supposed to be going over your notes and preparing yourself for this staple achievement. But instead, you find yourself doing the whole bobble head thing, getting dangerously to the steering wheel with each and every bob. If only there were something to keep you awake…
 This circuit 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.
Students: Maybe they forgot the exam was tomorrow, maybe they were out partying, or maybe they just waited until the last minute. In any case, college students always have the need to burn the midnight oil. The problem is that it is extremely easy to fall asleep in the midst of studying and before you know it, morning has come and the exam is already over or you still haven't learned the material. If you don't want that to happen, then keep this reliable anti sleep alarm at your side.
Chapter: 2 Circuit descriptions
 This circuit 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
2.1 Circuitry
2.2 Things Needed for Making this Antisleep Alarm

• Relay
• Bulb
• Transistor or SCR
• Push to ON /OFF switches
• Resistance & capacitor
• Pizzo buzzer
• Diode
• IC: IC CD4020
 The circuit is built around Schmitt trigger NAND gate IC CD4093 (IC1), timer IC CD4020 (IC2), transistors BC547, relay RL1 and buzzer. The Schmitt-trigger NAND gate (IC1) is configured as an astable multivibrator to generate clock for the timer (IC2). The time period can be calculated as T=1.38×R×C. If R=R1+VR1=15 kilo-ohms and C=C2=10 μF, you’ll get ‘T’ as 0.21 second. Timer IC CD4020 (IC2) is a 14-stage ripple counter.
 Around half an hour after the reset of IC1, transistors T1, T2 and T3 drive the buzzer to sound an intermediate beep. If IC2 is not reset through S1 at that time, around one minute later the output of gate N4 goes high and transistor T4 conducts. As the output of gate N4 is connected to the clock input (pin 10) of IC2 through diode D3, further counting stops and relay RL1 energies to deactivate all the appliances. This state changes only when IC1 is reset by pressing switch S1.
 Assemble the circuit on a general-purpose PCB and enclose it in a suitable
cabinet. Mount switch S1 and the buzzer on the front panel and the relay
at the back side of the box. Place the 12V battery in the cabinet for powering
the circuit. In place of the battery, you can also use a 12V DC adaptor.
03-08-2011, 12:23 PM
Post: #3
RE: Antisleep Alarm for Students
myself P.MURALIKRISHNA and i am from M.kumarasamy college of engineering, karur, tamilnadu. is it possible to get the project kit for pay...? sir/madam i need it for project expo.... is it possible to get ur contact number....
and my contact details.... +919789613066

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04-08-2011, 10:39 AM
Post: #4
RE: Antisleep Alarm for Students
To get more information about the topic "Antisleep Alarm for Students " please refer the link below
http://www.seminarprojects.com/Thread-an...8#pid53288
21-03-2012, 05:05 PM
Post: #5
RE: Antisleep Alarm for Students
i have connected circuit as per diagram but it is not working. output from this is not obtained. anyone can give me reason.


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