Unformatted text preview: Gray: 000,001,011,010,110,111,101,100 4. Draw a state diagram of a traffic light controller, such as the highway and small road intersection as below: • A busy highway is intersected by a little used farmroad. • Detectors C sense the presence of cars waiting on the farmroad. • With no car on farmroad, light remains Green in highway direction. • If vehicle on farmroad, highway lights go from Green to Yellow to Red, allowing the farmroad lights to become green. • These stay green only as long as a farmroad car is detected but never longer than a set interval. • When these are met, farm lights transition from Green to Yellow to Red, allowing highway to return to green. • Even if farmroad vehicles are waiting, highway gets at least a set interval as green. • Assume having an interval timer that generates a short time pulse (TS) and a long time pulse (TL) • TS is to be used for timing yellow lights and TL is for green lights....
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This note was uploaded on 02/21/2010 for the course EE 271 taught by Professor Thuyle during the Spring '08 term at San Jose State.
- Spring '08
- Electrical Engineering