2. This speed checker will come handy for the
highway traffic police as it will not only provide a
digital display in accordance with a vehicle’s speed
but also sound an alarm if the vehicle exceeds the
permissible speed for the highway.
3.
4. WORKING
•The system mainly consists of two laser transmitter-LDR sensor pairs which are
installed on the highway 100m apart such that the transmitter and LDR sensor
of each pair on the opposite sides of the road.
•When any vehicle crosses the first laser beam LDR1 goes high for the time set
to cross 100m with the selected speed (60KMPH) and LED1 glows during this
period.
•When the vehicle crosses the second laser light beam, the output of IC2 goes
high and LED2 glows for this period.
•Piezobuzzer sounds an alarm if the vehicle crosses the distance between the
LDRs setups at more than selected speed (
•The counter starts counting when the first laser beam is intercepted and stops
when the second laser beam is intercepted.
•The time taken by the vehicle to crop both the laser beams is displayed on the
7-segment display.
5.
6.
7. ADVANTAGE
• It is also prominent as a new digital integration technology. The
modulation mode and wireless control are the major reason
behind its rising popularity.
• Signal blockers are even used in universities, schools,
government agencies and prisons. Blocking conversation on these
places cannot certainly become a distraction. On the contract,
accused and students cannot cheat by contacting others or
outsiders.
• It has become a compulsory addition to high security areas like
detention centers and prisons. It prevents illegal communication
between visitors and inmates.
8. DISADVANTAGE
• Envisage a situation where you are essaying to dial 911 and
can not get through because someone has a cell phone
jammer with him.
• Otherwise, you want to call the police to avoid a robbery in
your building but the robber has a cell phone jammer with
him.
• Jamming devices utilized with some thoughts may be much
more useful than just a method of enjoyment.
9. • The Mobile jammers are used in the classrooms, and library to
maintain silence
• It is used in the seminar halls and meeting rooms to avoid
disturbances
• It is used in the hospitals
• The mobile jammers are used in the temples, churches, etc
APPLICATION
