Traffic Controller project and implimentation idea
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16-10-2010, 02:27 PM



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Traffic Contr oller

N.R. Paranjape



This simple traffic controller can be used to teach children rudiments of traffic rules. The circuit (shown in Fig. 1) uses readily available components. It mainly comprises rectifier diodes (1N4001), a 5V regulator 7805, two timers IC 555, two relays (5V, single-changeover), three 15W, 230V bulbs and some discrete components. Mains power is stepped down by transformer X1 to deliver a secondary output of 9V, 300 mA. The transformer output is rectified by a full-wave bridge rectifier comprising diodes D1 through D4, filtered by capacitor C1 and regulated by IC 7805 (IC1). IC2 is wired as a multivibrator with ‘on’ and ‘off’ periods of approximately 30 seconds each with the component values selected. As soon as mains power is switched on, pin 3 of IC2 goes high for 30 seconds. This, in turn, energises relay RL1 through transistor T1 and the red lamp (B1) glows through its normally-open (N/O) contact. At the same time, mains power is disconnected from the pole of relay RL2
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#2
21-04-2012, 10:27 AM

Traffic Controller



.pdf   Traffic Contr oller.pdf (Size: 257.23 KB / Downloads: 44)

This simple traffic controller can
be used to teach children rudiments
of traffic rules.
The circuit (shown in Fig. 1) uses
readily available components. It mainly
comprises rectifier diodes (1N4001),
a 5V regulator 7805, two timers IC 555,
two relays (5V, single-changeover),
three 15W, 230V bulbs and some discrete
components.
Mains power is stepped down by
transformer X1 to deliver a secondary
output of 9V, 300 mA. The transformer
output is rectified by a full-wave
bridge rectifier comprising diodes D1
through D4, filtered by capacitor C1
and regulated by IC 7805 (IC1).
IC2 is wired as a multivibrator with
‘on’ and ‘off’ periods of approximately
30 seconds each with the component
values selected. As soon as mains
power is switched on, pin 3 of IC2 goes
high for 30 seconds. This, in turn, energises
relay RL1 through transistor T1
and the red lamp (B1) glows through
its normally-open (N/O) contact. At
the same time, mains power is disconnected
from the pole of relay RL2.
As the ‘on’ time of IC2 ends, a
Fig. 1: Circuit of traffic controller
Fig. 2: Construction details of traffic controller unit
high-to-low pulse at its pin 3
triggers IC3 through C5. IC3
is configured as a monostable
with ‘on’ time of about 4
seconds, which means pin 3
of IC3 will remain high for
this period and energise relay
RL2 through driver transistor
T2. The amber lamp (B2) thus
lights up for 4 seconds.
As soon as 4-second time
period of timer IC3 at pin 3
lapses, relay RL2 de-energises
and the green lamp (B3)
lights up for the rest of ‘off’
period of IC2, which is about
26 seconds. The green lamp
is activated through the normally
closed (N/C) contacts
of relay RL2.

So when mains power is
switched on, red light glows for
30 seconds, amber for 4 seconds
and green for 26 seconds.
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pinkoo
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#3
22-04-2012, 09:30 AM

hello sir, i am arunkumar ece IV yr . i want to know more about the full description of simple traffic controller project and implimentation . and how does it works ? how to represent ? . so plez. telll/send on this email:-
(baghel.arunkumar921@gmail.com) as soon as poissible..
thanku sir,....
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#4
23-04-2012, 10:54 AM


to get information about the topic "Traffic Controller project and implimentation idea" full report ppt and related topic refer the link bellow

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topicideashow-to-intelligent-traffic-control-using-plc-full-report
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