Our Intelligent Traffic Light System is capable of changing priority level of the roads according to their traffic level. To measure the traffic level we have several mechanisms.
- Image Processing
- Pressure sensors, give reading when pressure changes by the vehicles
- Inductive Loops
From the above methods we choose inductive loop.It is build on the concept of inductance change of a coil when a metal object come closer.You know that when you send electrical current through a wire, it generates a magnetic field. For a coil this electromagnetic field is high.You can change the inductance of the coil and change the electromagnetic flux by introducing additional conductive materials into the loop's magnetic field. This is what happens when a car pulls up to the intersection. The huge mass of metal that makes up your car alters the magnetic field around the loop, changing its inductance.
So we have made a coil develop the inductive loop.We have some kind of metering device to meter the voltage level change in the coil. After some reading we have found this article, it really help to achieve our target.
In the above circuit diagram we can connect the LED's positive pin to PIC device to get the input. So using that we can easily develop a algorithm to achieve dynamic traffic controlling.
References : Above diagrams and pictures are extracted from the following resources on the purpose to gather all the knowledge in to one place for learn easily.
- http://www.fhwa.dot.gov/publications/publicroads/98septoct/loop.cfm
- http://auto.howstuffworks.com/car-driving-safety/safety-regulatory-devices/red-light-camera1.htm
- http://www3.telus.net/chemelec/Projects/Loop-Detector/Loop-Detector.htm
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