This project aims to design a digital controller to control traffic at an intersection. At each intersection, there are four traffic lights in red, yellow and green, and eight pedestrian lights in green and red, which naturally are the same for two-by-two vehicles and the four-by-four pedestrian lights also act the same.
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The pedestrian light is red when the car light is green or yellow, and green when the car light is red.
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The traffic light is green for 15 seconds by default and yellow for 4 seconds. Obviously, for the same cycle of the two sides, the red time of the cars is equal to the sum of the green and yellow.
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Police Interrupt Button: This button is available for both directions on the street and by turning it on any side that has the green light will change to yellow immediately.
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Pedestrian Interrupt Button: This button is also present on each side of the street.If the pedestrian lights are green and the remaining time is less than 3 seconds to reset, turning on this button will return this time to 3 seconds. Of course, pedestrians can only do this twice at a time.
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The status of all lights will be defined according to the interruptions that have occurred.
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Interrupts are synchronized with the clock.
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On each side of the street, smart cameras are installed that can measure the traffic on each side and give our control module a number. A low value indicates smoother traffic and higher value indicates heavier traffic. The intersection timetable changes based on two numbers, each corresponding to a street.
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We have a memory where the data from the cameras is stored.
This project needs Icarus-Verilog and a VCD viewer.
- Icarus-Verilog can be installed via Homebrew :
$ brew install icarus-verilog - Download Scansion from here.
- Clone the repository.
- Change the directory to src.
$ make check- compiles the verilog design - good for checking code.$ make simulate- compiles design+TB & simulates the verilog design.$ make display- displays waveforms.
