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In your delay loop, poll a pedestrian crossing button. When the button is pressed, set a flag indicating that a pedestrian is waiting to cross. At some point in the main loop where all the lights are red but before it turns the next light green (say, at the end when you branch back to main), check the flag. If it is set, make all lights red and illuminate the walk signals for a period of time. Reset the flag at this point. Then flash the Don't Walk a few times, then resume the normal light cycle.hey all;
I need some assistance in designing a 4way traffic light system and ped crossing using a pic16f877. I have already developed the codes for the 4 way lights but i am having trouble with incorporating the ped crossing. Could someone give me some assistance please.
Rawle.
ps. here is what i have.
View attachment 13491
It could be "any of the above". Most lights in the northeast USA at least have control boxes for each intersection/set of lights, and most of them use inductive sensors in the road to detect when there's cars waiting for the light. The controllers can be wired together so that the lights can be synchronized as well--this is often done when there's two sets of lights near one another, say at a highway junction where the ramps in one direction meet the road in one spot (one light) and the ramps in the other direction meet in another spot (the other light).Does anyone know how actual traffic lights are controlled? Is it a central control centre where there are cameras at junctions being monitored by humans or stand-alone systems where each junction is controlled independently by a computer in one of the light boxes? Or is it completely different depending where you are in the world?
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Hello,
Could you help me design a traffic light junction with a RAM memory?
Mike look at the dates this is a dead thread.looks to me like the 2n2222 transistors are hooked up backwards in the middle diagram... the emitters should be tied to ground.
View attachment 68566
Mike look at the dates this is a dead thread.
The RAM memory is in project specifications.I thought you could help me with am ideea, instead asking why i choose to use RAM memory...