Traffic light control

This is a discussion on Traffic light control within the C Programming forums, part of the General Programming Boards category; Hi all, I am being asked to do a project on light traffic control on real time basis. I need ...

  1. #1
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    May 2010
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    Question Traffic light control

    Hi all,
    I am being asked to do a project on light traffic control on real time basis. I need to implement a C code for three intersection and display it in words on the output screen.
    I should also include the pedestrian sensor button(assign letter in keyboard). we are using QNX software on VMWare. Could you help me start with this. Some outline on how to start programming this will be useful. We are supposed to have a central controller which controls the 3 local controller intersection. Should I start with process and threads?
    If so how?

  2. #2
    Registered User claudiu's Avatar
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    Some more pertinent description of the project requirements could help us help you. Post the actual project description here.
    1. Get rid of gets(). Never ever ever use it again. Replace it with fgets() and use that instead.
    2. Get rid of void main and replace it with int main(void) and return 0 at the end of the function.
    3. Get rid of conio.h and other antiquated DOS crap headers.
    4. Don't cast the return value of malloc, even if you always always always make sure that stdlib.h is included.

  3. #3
    Third Eye Babkockdood's Avatar
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    Here's something I whipped up. I'm not sure how to do the pedestrian sensor button, tho.

    Code:
    #include <stdio.h>
    #include <time.h>
    
    fiftyseconds()
    {
    	time_t start;
    	time_t current;
    	time(&start);
    	do
    	{
    		time(&current);
    	}
    	while(difftime(current,start) < 50.0);
    }
    
    twoseconds()
    {
    	time_t start;
    	time_t current;
    	time(&start);
    	do
    	{
    		time(&current);
    	}
    	while(difftime(current,start) < 2.0);
    }
    
    redlight()
    {
    	printf("X Ave. - RED; Y Blvd. - GREEN\n");
    	fiftyseconds();
    	printf("X Ave. - RED; Y Blvd. - YELLOW\n");
    	twoseconds();
    	printf("X Ave. - RED; Y Blvd. - RED\n");
    	twoseconds();
    	printf("X Ave. - GREEN; Y Blvd. - RED\n");
    	fiftyseconds();
    	printf("X Ave. - YELLOW; Y Blvd. - RED\n");
    	twoseconds();
    	printf("X Ave. - RED; Y Blvd. - RED\n");
    	twoseconds();
    }
    	
    int main()
    {
    	printf("Stoplight 1.0\n\n");
    	while(1)
    		redlight();
    	return 0;
    }
    Since I'm not an expert on stoplights, I just assumed that the green light lasts fifty seconds.
    Last edited by Babkockdood; 05-09-2010 at 01:35 PM.

  4. #4
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    traffic light with LCD

    I am being asked to do a project on light traffic control. i need to use interrupt, timer and LCD and need to implement a C code for three intersection and display it in words on the output screen. i will use PIC18F4520 for this project. Timer is used to count the number of green, yellow and red color. Interrupt is applied when pedestrian walk button is pressed. Could you help me?.

  5. #5
    and the hat of wrongness Salem's Avatar
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    > Could you help me?.
    No we can't.
    How To Ask Questions The Smart Way
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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