28-11-2012, 06:14 PM
Traffic Light Controller
Traffic Light.ppt (Size: 3.33 MB / Downloads: 44)
History
The world's very first traffic lights were invented by J P Knight installed near London's House of Commons, which was on the intersection of George and Bridge Street, in 1868.
In 1914 The American Traffic Signal Company installed red and green traffic lights on every corner of the intersection of 105th Street and Euclid Avenue in Cleveland, Ohio.
First traffic lights were all controlled by either timing, or manually switched
Traffic Light Controllers
There are a couple of types of controlling systems used for traffic lights today. They are fixed timed, dynamic, coordinated, and actuated controls.
How it Works
The capsense slider has different points that respond to the different places touched.
The first two points on the slider shows that there are no cars are at the intersection, which is displayed on the LCD screen. LED number one stays on representing that the light is red.
As you slide your finger down the slider, the LCD screen displays that cars are approaching and the LED will change to LED 3. This represents that the light has changed green.
As you slide your finger down further, the LCD screen will change again and display caution, meaning that cars must slow down. LED 2 will turn on. This represents that the light is turning yellow.
Finally the LCD displays that there are no more cars passing and the LED 1 turns back on.