Electronics > Beginners

Traffic light circuit with 556 timer?

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james_s:

--- Quote from: SmokeyTheElectrician on December 29, 2019, 03:22:01 pm ---Wow,
the official was not fired
plus no injunction against the city?

--- End quote ---

Nope, in at least one case they tried to fine the guy $500 for calling himself an engineer without being a certified professional engineer.

https://interestingengineering.com/calling-himself-engineer-got-this-man-fined-500

themadhippy:

--- Quote ---If you know exactly when the light will change, you will be encouraged to not slow down as you approach a red light
--- End quote ---
dont go to Thailand then,not only do you have the pretty lights but also a countdown timer showing how long each aspect has to last

Zero999:

--- Quote from: SmokeyTheElectrician on December 29, 2019, 03:22:01 pm ---Around my neck of the woods,
at least they have delayed the green,
as they know everyone is racing it to
get through those amber signals.
--- End quote ---
We also have delayed green. The problem is it encourages people to jump the lights when they realise it's still red on the other side and go anyway. Turning red a little early and green a bit late are good safety features, but they shouldn't be too long, otherwise it makes it more dangerous and frustrates drivers.

schmitt trigger:
It seems that different countries have different ideas to discourage bad driving behaviors.

That is the reason a microcontroller based system is so powerful. Different rules may be easily implemented.

We have drifted far, far away from the OP’s topic.

phennessey:

--- Quote from: Zero999 on December 21, 2019, 09:54:31 pm ---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.
(Attachment Link)

--- End quote ---

I don't understand a lot of these symbols, can you help me identify the arrows and the "I1" and "O1" tags? Are those supposed to be probe points? And I don't understand the arrow symbols. Are those all ground? I thought a schmitt trigger had one input and one output. But this circuit is showing all the triggers with arrows pointing out of them, which is deeply confusing to me. The 74HC14 only has volts in and out, plus six triggers, all of which only have one input and one output. But you drew this diagram with ground terminals on every trigger. Can you explain this a bit?

I tried to redraw your circuit...did I goof?

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