Electronics > Beginners
Traffic light circuit with 556 timer?
phennessey:
For the ring oscillator, can the timing be altered between each LED flash by changing resistance values?
phennessey:
It isn’t an obsession, it’s just that I feel like a microcontroller is cheating. It’s too easy! (That being said, I ordered one anyway.) I’m going for “simple” and “elegant” solutions with common discrete components and basic ICs :)
phennessey:
That’s great, but did you try it using a 556 timer instead? :) Apparently it’s impossible!
SmokeyTheElectrician:
--- Quote from: phennessey on December 22, 2019, 11:00:18 pm ---That’s great, but did you try it using a 556 timer instead? :) Apparently it’s impossible!
--- End quote ---
If the above is in reply to my responses,
either you did not carefully read through all of them
or am I being trolled?
Everything needed to get your circuit functioning as you
originally requested has been covered in my posts ( aside
from maybe some typo or other mistake in communication ).
It is left for you to take the help I have offered and
help yourself by redrawing your circuit using a single
556 in place of the two 555's.
phennessey:
I’m not trolling, I just thought it had been established (by others in this thread) that this circuit cannot be done with a 556, because the power to the second 555 comes from the output of the first 555, and that cannot be replicated with a 556, which only has one +V input. I thought your instructions were using two separate 555s.
Frankly, most of this is over my head. I have ordered the parts and I plan on tinkering. I’ll even sketch an attempt (I don’t have any circuit software, so I’m drawing stuff with Adobe Illustrator.) I was just hoping someone would sketch out a 556 timer circuit so I could try to translate it to a breadboard. I initially thought this would be a simple enough request that it would just be matter of re-drawing a couple lines in the first diagram I posted (which I did not make, nor do I fully understand.)
Regardless of what happens, I plan on building this thing and I don’t care how long it takes me! Parts are ordered and that’s that!
I plan on attempting this circuit in 4 different ways:
1. 2x 555
2. 1x 556
3. 1x 74hc14 (ring oscillator)
4. attiny85 (I ordered the usb programming board, too)
Everyone’s help has been incredibly valuable. I will post results here!
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