Electronics > Beginners
Traffic light circuit with 556 timer?
rstofer:
--- Quote from: james_s on December 21, 2019, 07:17:13 pm ---As one of the small minority of people who still insists on a proper manual gearbox I've often wished it was. Seems like a handy feature that has never been implemented in this part of the world.
--- End quote ---
Well, in the '60s, we would have used it to put torque on the rear wheels in anticipation of getting the green light. Street racing...
I first encountered it when I was stationed in Germany. I thought it was a very efficient way to tell people it was just about time to go. I wonder how many T-bone accidents it facilitates.
james_s:
I haven't ever bothered to look at any statistics on that. I've formed a habit of looking at the cross street signals if I can see them and when those turn yellow I put my car in gear. I like having a warning so I'm not either holding the clutch down the whole time I'm sitting there, or abusing the 1st gear synchro by stuffing it into gear to go before the guy behind me has a fit.
Zero999:
The sequence seems to differ the world over.
In the UK it's:
Red
Red & Amber
Green
Amber
Red
What sequence does the original poster require?
If it's just sequentially lighting the LEDs one after the other, just use a ring oscillator. Here's an example which can be built with the 74HC14.
schmitt trigger:
--- Quote from: Zero999 on December 21, 2019, 09:54:31 pm ---The sequence seems to differ the world over.
What sequence does the original poster require?
--- End quote ---
Exactly,
That is the reason I suggested to the OP that he must construct a truth table listing all the states on all the roads.
But perhaps he only requires to build a ring oscillator, just like you indicated.
phennessey:
Red, green, yellow. That simple. Timing: Red and green for longer, yellow shorter.
I’m trying to use only a 556 timer and the components listed in the diagram. Can it be done? I already ordered these components from Digikey...honestly just hoping there’s a way to do it with them. My goal is to use as few components as possible!
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