08-16-2017, 08:57 PM
AUTOMATED TRAFFIC SIGNAL CONTROLLER
[attachment=17079]
INTRODUCTION
Now a days due to ever increasing vehicles on the road, it require a efficient control on the four way junction of road. In order to find a solution to this problem the concept of an automatic traffic controller is conceived. Apart from providing efficient control of traffic, it also eliminate chance of human errors since it function automatically
The automatic traffic controller automatically switches on the four way junction for 15 seconds for direction control.
The main circuit components used are 555-Timer and 4-bit binary synchronous counter (74160). The 555-Timer generates a clock signal for 15 seconds. This signal is used to clock counter circuit. Binary counter is converted to 3 bit counter to achieve 8 possible cases. The traffic light control is done by different Boolean function of logic gate.
TECHNOLOGY:
Optics and lighting:-
In the mid 1990s, cost-effective traffic light lamps using light-emitting diodes (LEDs) were developed; prior to this date traffic lights were designed using incandescent or halogen light bulbs. Unlike the incandescent-based lamps, which use a single large bulb, the LED-based lamps consist of an array of LED elements, arranged in various patterns. When viewed from a distance, the array appears as a continuous light source
These GAL products can be segmented into two broad categories:
Base products
Extension products
Base Products - Aimed at providing superior design alternatives to bipolar PLDs, these five architectures replace over 98% of all bipolar PAL devices. The GAL16V8 and GAL20V8 replace forty-two different PAL devices. The GAL22V10, GAL20RA10, and GAL20XV10 round out the base products. These GAL devices meet and, in most cases, beat bipolar PAL performance specifications while consuming significantly lower power and offering higher quality and reliability via Lattice s electrically reprogrammable E2CMOS technology.