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rss14

Wed Jun 04, 2008 5:02 pm


Help with parallelget and traffic lights assignment

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I need to make a project about a traffic intersection. So i need to write a code, which turns on pins on a parallel port, so that my LEDs turn on, as they would in real life. 

The wires are inside a cable, which has 8 wires in total

2 reds are connected to pin 2 (1), 2 opposite reds are connected to pin 3 (2), 2 yellows are connected to pin 4 (4), opposite yellows are connected to pin 5 (8), 2 greens are connected to pin 6 (16), and opposite greens are connected to pin 7 (32)

Pin 19 is ground. I have an extra wire, which i haven't attached to the parallel port yet.

loop
    parallelput (33)    % Red, Red, Green, Green  
       delay (5000)

    parallelput (9)     % Red, Red, Yellow, Yellow 
       delay (2000)

    parallelput (18)   % Green, Green, Red, Red 
      delay (5000)

    parallelput (6)     % Green, Green, Red, Red 
      delay (2000)
end loop 

I need to modify this code, so I can incorporate a button, and another LED, for a crossing light. I am thinking of connecting the extra wire to pin 11, so I can use parallelget to know when the button has been pressed. Then i will keep that in a variable, until the light can go on. . . 

So basically, i need to know how to write parallelget . . . Any other help will be appreciated. Thanks.