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I have a DS-1302 RTC module but how to use it?
I recall Jon Chandler made a vu meter clock but what he used for timing?
Am planning on a clock that has no hands, just LEDs but precision would be nice.
I look forward to ALL the suggestions on this site.
Been busy with repairing some clock circuit boards and experimenting with a 74hc595.
I know something isn't right as it doesn't want to work as it is supposed to.
Maybe the breadboard I am using is at fault? Have read that breadboards are not 100% reliable.
Have checked and rechecked my wiring so am finishing up using a perf board. Hopefully it will perform as desired.
I soldered up a perf board, just need to install the Leds but here is my layout schematic.
As for the clock project, rethinking the shif registers or go back to my original design using mosfets
Based on your schematic, I really don't think you understand the fundamentals of a pull-up vs. a pull-down resistor and I wonder if your continuous "missing the point" rhetoric is simply a means to test our sanity.
What is a pull up and pull down resistor? A Pull-up resistor is used to make the default state of the digital pin as High or to the logic level (in the above image it is 5V) and a Pull-Down resistor does exactly opposite, it makes the default state of the digital pin as Low (0V).
Based on your schematic, I really don't think you understand the fundamentals of a pull-up vs. a pull-down resistor and I wonder if your continuous "missing the point" rhetoric is simply a means to test our sanity.
I must admit I hadn't looked closely at that schematic (they rarely reflect reality anyway). As drawn, without anything connected to the micro connector, those floating inputs will sure lead to problems.
Nothing at all. It looks like it was copied from a reliable source where you might actually learn something and understand what you're trying to do.
But it so frustrating trying to help you because when somebody points out errors in your schematic, rather than attempting to understand what they're talking about, you just copy&paste something different and throw it against the wall to see if it sticks this time.
An example: When your '595 test circuit didn't work, you blamed it first on bad parts, then on a bad breadboard. You didn't post a schematic of what you were doing (and if you were following the schematic you posted in #243, it's clear why it didn't work) and you ignored requests to explain what sequence you were pushing buttons. Random button presses will not make the circuit function.
250 posts and 13 pages in this thread and you don't have a working plan yet. And you haven't even got to the question of code yet.
As someone who has wasted an inordinate amount of time trying to help you, it would be so f**king awesome to see you actually understand how something works. This '595 circuit is all but trivial. It's not rocket science nor difficult to understand with the tiniest amount of effort.
The only difference is I added a header that post #247 does not have. Use as a test point?
I just want to have a working 595 circuit that works then I can experiment with. it.
The breadboard had issues so assembling a perf board. Hopefully get it assembled today?
No. The major difference is the schematic in post #243:has the pull-up/pull-down resistors wired incorrectly. They aren't pulling the data lines anywhere. See posts 244 – 246. If somebody says something is wrong, don't just blow them off. If you don't understand what they are saying, ask them to explain.
What is the voltage on the line highlighted in yellow when the button isn't pressed? Is the resustor circled in red connected to the highlighted line when the button IS NOT pressed. Compare it to the diagram be80be posted.
I had a bread board that you had to hold down the ic didn’t matter which you used I sense got a good one problem fixed whole lot easier getting it to work on breadboard then a solder mess
You may consider me an a$$ for not just pointing out the error(s), and even explaining them, but that never proves effective. In this case, figuring it(them) out may be a learning experience. At any rate, I spotted an error at a quick glance. There may be others.
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