Simple LED Analog Clock Idea

[For The Popcorn]

I don't give a rat's sphincter

Tsk. Tek. Language!

 

[MrDEB]

Nice looking clock, why through hole resistors?
I found ordering boards very expensive thanks to the tariffs

 

[Nigel Goodwin]

Nice looking clock, why through hole resistors?

It's vastly faster to hand assemble using through hole than SM, so it makes perfect sense - if you're having it assembled by the PCB manufacturer, then use SM instead.

I found ordering boards very expensive thanks to the tariffs

Not in the UK it's not

 

[For The Popcorn]

Not in the UK it's not

$51 bucks to have pcbs that cost a buck delivered to the US. And the orange mango is having a tantrum and threatening to raise traffics back to the highest levels from April. He's screwing Americans.

 

[Nigel Goodwin]

$51 bucks to have pcbs that cost a buck delivered to the US. And the orange mango is having a tantrum and threatening to raise traffics back to the highest levels from April. He's screwing Americans.

He's made a great country a laughing stock all round the world, but that’s what America voted for

 

[MrDEB]

this thread got me to thinking of building a clock on a perf-board BUT using 60 green LEDs for minutes

 

[For The Popcorn]

that’s what America voted for

It's what a third of Americans voted for. A third of Americans voted against trump. And a third couldn't be bothered to get off their arse to vote. "They're both the same, all politicians are crooks."

Too many people have been fooled by the likes of Fox News, and the endless string of lies promulgated by trump and his stooges. Many of the third that voted for him are starting to see the light, but the brainwashed, Kool-aid-drinking disciples think he's God incarnate.

trump supporters take joy in all the evil and cruelty being inflicted on "them" but some are starting to understand that they have served their purpose and are no longer part of "us."

Yes, I am surely this will be deleted for being "too political" but this is quite literally a matter of life and death and unstablizing the world.

To our friends and allies around the world, please understand that all of this is the work of a small group of greedy, bigoted, power hungry people with a demented, easily manipulated leader. The majority of us are horrified and terrified about what the future may bring.

 

[For The Popcorn]

this thread got me to thinking of building a clock on a perf-board BUT using 60 green LEDs for minutes

You have "been thinking about this" for 11 months and despite 20 pages of forum posts, you're no futher along on the project.



You apparently didn't read the description of this concept, nor the rational behind it. I have explained in your other thread why a conventional analog clock using 12 LEDs to indicate hours is not workable. And that IS NOT what my intention in this design is.

LEDs don't easily replicate the hands of an analog clock, at least without a multitude of them. Following the theme of my analog clock, an easy-to-understand "about" clock is pretty simple. A ring of 60 LEDs (60 to preserve the ability to display minutes, but 48 works better for this idea) displays not minutes, but hours. As the hours progress from noon to midnight, the ring is progressively illuminated (and repeated from midnight to noon). The ring of LEDs can be controlled by eight 74HC595 shift registers.

Inside the ring of 60 (or 48) LEDs are 12 LEDs to indicate the hour positions. These LEDs will always be illuminated.

Perhaps this is your best option:

 

[MrDEB]

I see I am not th only one who thought about using the 4017 counter.

 

[For The Popcorn]

I see I am not th only one who thought about using the 4017 counter.

Please feel free to do what you like. This post is about using shift registers, so take it elsewhere.

 

[For The Popcorn]

You can use 74HC4017s, but you have ZERO flexibility if you do. Exactly one LED which march around in a circle for the rest of time (ok, two LEDs if you insist on using one LED for minutes and one for hours). At some some point you may come to understand that if the "55" and "12" LEDs are illuminated, it's not almost noon – it's almost 1:00. But anyone else looking at the display will be confused. Look at the hour hand as time progresses. But you'll be stuck with it.

That's why I'm not attempting to emulate an analog clock. If you use 12 additional LEDs to indicate half-hours, your concept might be workable – it's after 12 and not yet 1.

Using the '595 shift registers, for little difference in cost or layout complexity, you could light up any or all LEDs as you see fit. You could do exactly as you've described. Or you could make time runs backwards. Or display a 10 minute timer. But this has all been explained before in your 20 page thread and you choose not to understand.

I'd tried. Please don't bog my thread down – take further discussion elsewhere.

 

[MrDEB]

yes I realize the 4017 is a bad idea.
I like the 74hc595 idea
wonder how expensive if I have boards made but shipped to the UK THEN HAVE THE PERSON IN THE UK ship me the boards
Thinking how to get around the stupid tariffs that Trumpinokio put up.
Sorry if I bogged down your thread

 

[MrDEB]

Curious would a single resistor save 7 resistors?

 

[AnalogKid]

Curious would a single resistor save 7 resistors?

Only if it is guaranteed that only one LED will be on at any given time.

Also, this technique puts a reverse voltage across the off LEDs, Because the circuit voltage is only 5 V, this is not a problem. In a 12 V circuit, the reverse voltage could be great enough to cause reverse breakdown of the off LED junctions.

ak

 

[For The Popcorn]

Curious would a single resistor save 7 resistors?

I am dumbfounded that despite examples, videos, and explanations, you STILL are locked into a mindset of only a single LED being on at a time. Why lock into the most limited design that will result in an un-decipherable display (for reasons already explained numerous times), when you can have the ultimate flexibility of lighting up any or all LEDs at once?

But again, please feel free to discuss this in your own thread.