Automatic School Bell
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computer science topics
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Posts: 610
Joined: Jun 2010
08-06-2010, 11:50 PM

this project and implimentation is is an embedded System That can be built to automatically Ring the bell At various intervals(needs timer circuit) according to user need and must be programmable by user for working days and this device need to work in two modes
1.normal mode (where it ring the bells automatically without any human intervention)
2.emergency mode(this mode is use to stop the bell or rang the bell manually )
Use Search at wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion
seminar flower
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Posts: 10,120
Joined: Apr 2012
01-10-2012, 10:56 AM


.pdf   AUTOMATIC SCHOOL.pdf (Size: 138.8 KB / Downloads: 113)

Consider that a school has a total of
eight periods with a lunch break
after the fourth period. Each period
is 45 minutes long, while the duration of
the lunch break is 30 minutes.
To ring this automatic school bell to
start the first period, the peon needs to
momentarily press switch S1. Thereafter,
the bell sounds every 45 minutes to indicate
the end of consecutive periods, except
immediately after the fourth period
when it sounds after 30 minutes to indicate
that the lunch break is over. When
the last period is over, LED2 glows to indicate
that the bell circuit should now be
switched off manually.
In case the peon has been late to start
the school bell, the delay in minutes can
be adjusted by advancing the time using
switch S3. Each pushing of switch S3 advances
the time by 4.5 minutes. If the
school is closed early, the peon can turn
the bell circuit off by momentarily pressing
switch S2.
The bell circuit contains timer IC
NE555 (IC1), two CD4017 decade counters
(IC2 and IC3) and AND gate CD4081 (IC4).
Timer IC1 is wired as an astable
multivibrator, whose clock output pulses
are fed to IC2. IC2 increases the time
periods of IC1 (4.5 and 3 minutes) by ten
times to provide a clock pulse to IC3 every
45 minutes or after 30 minutes, respectively.
When the class periods are going
on, the outputs of IC3 switch on transistors
T1 and T2 via diodes D4 through
seminar tips
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Posts: 8,857
Joined: Oct 2012
25-10-2012, 12:24 PM

to get information about the topic "automatic school bell"full report ppt and related topic refer the link bellow



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