| Electronics > Beginners |
| Traffic light circuit |
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| sokoloff:
--- Quote from: Benta on June 10, 2018, 04:35:00 pm ---Don't know about Australia, but in Europe the traffic light sequencing is a bit more involved: Green -> Amber -> Red -> Red/Amber -> Green --- End quote --- In Austria last week, I noticed an additional light phase: Green -> Blinking Green -> Amber -> Red -> Red/Amber -> Green |
| Zero999:
--- Quote from: ebastler on June 10, 2018, 06:41:25 pm --- --- Quote from: Hero999 on June 10, 2018, 10:40:14 am ---Why do you want to avoid DIL14 packages? Which is easier? One DIL14 package or several DIL8 packages? --- End quote --- You might consider actually reading this thread? It's not that long, and much of it revolves around the OP's desire for using 8-pin devices or smaller, and the reason for that desire. It is indeed much easier to fit several DIP8 packages into several DIP8 sockets, than to fit even a single DIP14 package into said DIP8 socket. :P --- End quote --- You might want to consider whether what you've got to say is helpful before typing . . . So what if I missed something? It should have been obvious I posted with the best of intentions. 555 timers could easily be used for the NOT gates. All that's required is a little imagination. = https://electronicsclub.info/555buffer.htm --- Quote from: Benta on June 10, 2018, 04:35:00 pm ---Don't know about Australia, but in Europe the traffic light sequencing is a bit more involved: Green -> Amber -> Red -> Red/Amber -> Green --- End quote --- Yes, it's like that in the UK too, although the original poster said just flipping from red, amber and green is fine for now. I suppose more complex sequences can be added later. |
| rthorntn:
Thanks everyone. I think the ring oscillator is what I'm looking for, nice and simple, brilliant. The snap circuits have 3 x NOT gate modules. On reading a bit more on this it looks like a NOT gate is just a single transistor so can I just use 3 transistors? On further reading maybe 3 x MOSFET not BJT (something about high impedance inputs) It's basic stuff for now. |
| vk6zgo:
--- Quote from: Benta on June 10, 2018, 04:35:00 pm ---Don't know about Australia, but in Europe the traffic light sequencing is a bit more involved: Green -> Amber -> Red -> Red/Amber -> Green --- End quote --- Normal sequence in Australia is Green -> Amber -> Red -> Green.(with, in many cases, additional things like turn arrows & pedestrian lights.) I was horrified to see some traffic lights in the UK back in the '70s which had Amber both ways at the same time! They also had such delights as "three lane roads" with a common passing lane. It just shows that if you are used to it, almost everything works! |
| JohnnyMalaria:
--- Quote from: vk6zgo on June 11, 2018, 02:11:08 am ---They also had such delights as "three lane roads" with a common passing lane. It just shows that if you are used to it, almost everything works! --- End quote --- Not only that, there are some three lane roads that have two lanes going in one direction and one in the other with nothing to divide the two. Why? Because the direction of the lanes switches from morning to evening to account for the rush hour traffic. In the middle of the day and night the centre lane is bidirectional (like you describe). |
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