AUTOMATED TRAFFIC SIGNAL CONTROLLER
Prabhat Kumar Shukla
Main Features of the Controller
Assumes equal traffic density on all the roads.
2. Allows the pedestrians to safely cross the road
during certain periods.
Uses digital logic, can be easily implemented by
using logic gates.
4. Is generalized and can be used for different roads
with slight modification.
5. Can also be exercised manually when desired.
Synchronous Decade Counter
Count from 0 to 9 (0000 to 1001 in binary).
For normal counting, the reset, preset,
countÃ‚Â enable and carryÃ‚Â in inputs should
all be high.
When countÃ‚Â enable is low, the clock
input is ignored and counting stops.
The counter may be preset by placing
the desired binary number on the
inputsÃ‚Â A-D, making the preset input
low, and applying a positive pulse to
the clock input.
A highly stable device for generating accurate
time delays or oscillation.
In the time delay mode of operation, the time is
precisely controlled by one external resistor and
In this Automated Traffic Signal Controller, Timer 555 is used as an Astable Multivibrator to generate clock
signal for the 4-bit counter 74160.
Digital Logic Applications and Design by John M. Yarbrough, Thomson
Fundamentals of Electronic Devices and Circuits by David A. Bell
Fundamentals of Logic Design by Charles H. Roth, Thomson
Synchronous Up/Down Counter by Stan, M. R. and Bufieson, W. P.