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.
The circuit is built around Schmitttrigger 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 intermediatebeep. 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 outputof 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 suitablecabinet. 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, youcan also use a 12V DC adaptor.
59 comments :
please provide exact step to step description
please i need it urgent by tomorrow...
pls provide full notes about this circuit pls.. We it urgent...
it is not understandable clearly..can u please make it as clear description...
more info.to be given
more info to be given
concept is good,bt it needed clear description...
i hope u would help me...
we have decided to do this project we need clear description
please make clear description on this project and if possible please upload some images for it. thank you.
we need complete descriptions pertaining this model..c'd yo plz!!!!
sir, we have decided to this project, can u plz send us all the details about the project i.e step by step indtruction, what all is required and how does it works and etc.
thanking u in anticipation
give description
its not working properly
i want to make this project.
so, can you give the complete description of the project. pls.........
can u plz snd the total information
pls give the complete description of the project and if possible please upload some images for it...
pls give the complete description of the project and if possible please upload some images for it...
plz give the full discription about this project
kindly give the full report of this.........
i need the full details and components used in this
bakchodi chal ra hai???achhe se description do yaar....
send ur name nd number to my no. 8088013116 than i give u full detail
has anybody done this project??does it work properly
pls send me the full details...itz urgent sir...
my mail id
niyaskunjimon@gmail.com
PLEASE GIVE ME THE FULL DSCRIPTION ABOUT THIS... I AM WAITING...PLS...
MY E-MAIL ID-RAZAKVH786@GMAIL.COM
pls send more mini projects that r belong to ece and it.....Nice project we are impressed on ur project
plzzz send me full description about this project. i want to do it,, plzz send on ritesh.hell11@gmail.com
i like this project i want to do this project so could you plz give the full information
i m interested to do this.plz give full details
i m interested to do this.plz give full details
I have done this. I also have the PPT and documentation with complete explanation for this.
If you need of it, you can contact me through email dkh.hyd@gmail.com
not working properly...shit!!!
im interested to do this project sir, please provide full details
very urgent sir!
anticipating fr very quick response to
lakshmanvi259@gmail.com
FOr More :
www.trendyprojects.blogspot.com
plz send detailed info at kamal.choudhary78@gmail.com plz plz plz plz plz
Can anyone plz help me out to complete this project.....???
any body pls help me ths project. i hav already started but i am not getting output and its urgent.Anybody pls help me pls...........
SIR i really like ur concept bt i also need some details about this project....pls sir...help me...
SIR i really like ur concept bt i also need some details about this project....pls sir...help me...
Hi
I wanted more details of this project. Can you forward me to subisubrahmanian@gmail.com
i m interested to do this project...
so plz send me detail of this.
rajguptaeee@gmail.com
i have choosen this topic for my mini project so plz provide full details for this project as soon as possible plzzzzzz.....waiting for ur response.
palak1528@gmail.com
please send me the full description of this circuit. i have to deign it for my minor project
hiii sir pls give me full description of this proj on vk10144@gmail.com
plz provide full description of the project on id shruti0714@gmail.com as soon as possible
Want to Know more About EEE and Arduino Projects :
Visit:
www.ieeexplorer.blogspot.in
hi..pls provide the full details of project and how it works ..i am doing my mini project on this pls send its documentation also pls .......as soon as possible
hi i am doing my mimi project on anti sleeping alarm so pls provide step by step description and clear explaination i want it immediately plss respond soon
I would like to do this as my mini project pls provide clear descriptions and how it works.....pls respond as soon as possible.
benitta.wilson14@gmail.com
hiii sir pls give me full description of this project.. syafiqah_ishak@yahoo.com
Can i have full information
Can i have full information
pls provide full discription to me soon...
Pls give me step by step procedure it's urgent
Pls give me step by step procedure it's urgent
plz provide the description .................
hi..
can i have full information aout this.......expecting positive and very quick reply..
pls... mail me at coolguy4191@gmail.com - See more at: http://www.examsadda.com/2011/05/btech-mini-project-on-anti-sleep-alarm.html?showComment=1390410935889#c16236837832797675
pls give me more details of the project.... hrsh.h2@gmail.com
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