using a RTC in SF basic

[MrDEB]

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.

 

[MrDEB]

Go to thinking about Jons's comment. Duh, I hadn't finished the schematic and failed to include any 500ohm resistors for the LEDs

 

[For The Popcorn]

Go to thinking about Jons's comment. Duh, I hadn't finished the schematic and failed to include any 500ohm resistors for the LEDs

What comment are you referring to? The one where I posted the table from the datasheet showing THE MAXIMUM CURRENT IS 1 mA? Apparently not that comment. Or maybe the comment where I suggested CHECKING HOW MUCH CURRENT THE CD4017B CAN SOURCE OR SINK?? Apparently not that comment either.

 

[For The Popcorn]

 

[MrDEB]

am going by the data sheet that says 10ma output.
maybe not at 5v?

 

[For The Popcorn]

My apologies. I forgot to include the picture. At Vdd = 5v, the maximum source or sink current is 1 mA. If Vdd = 15v, the maximum current is 6.8 mA. Nowhere does the datasheet claim 10mA.

I'll say no more.

 

[ChrisP58]

Here is the table with the 5Volt numbers marked.
Please note the Vo number at the left. That shows the actual pin voltage when driving the listed current.
The only 10mA number comes from the Absolut Maximum Values table. But that is an input current rating.
https://www.ti.com/lit/gpn/cd4017b

 

[MrDEB]

Well, I guess I need to make some input voltage adjustments.
There goes the 5v USB
Thanks

 

[MrDEB]

Here is a transformer for the LED strip lighting at a pretty good price.
We just need to add a voltage regulator.

 

[MrDEB]

been re-examining the 74hc595.
MY bad
It is a better choice
back to the drawing board

 

[MrDEB]

Well I hope this cascading schematic of 74hc595 is correct. Have to figure out what to do when the last LED is enabled. Still need to do the green LEDs.

 

[MrDEB]

note only one blue led on at any time

 

[For The Popcorn]

I did this before I saw your schematic. Please do it this way. Use the Swordfish SHIFT module.

ALL of the LEDs, including the 7-segment displays should be operated from the same data stream, clock and latch lines. Set up an array of bytes equal to the number of 74595s. When the display is to be updated, update the needed array elements and shift out ALL of the data then pulse the latch high.

The output enable pins may be used to dim the displays. I have separated the clock LEDs from the display LEDs so each section can be controlled independently.

You have a high chance of success using this circuit and it will be easy to route.

 

[MrDEB]

Where did the 7-segment display come from?
Am thinking it was inserted as an example
looked for the shift module but none to be found?

 

[For The Popcorn]

Some time in the past in this thread or maybe one of the numerous other ones you mentioned a 7 segment display. It's easy enough to add if you want it or leave it out. Sorry, I'm old – I can't keep track of all your permutations.

 

[For The Popcorn]

When the data is shifted out, each place there is a high, the LED will be on. Each place there is a low, the LED will be off.

% 1  0  0  1  1  0  0  0

  ●  ○  ○  ●  ●  ○  ○  ○

 

[Pommie]

When the data is shifted out, each place there is a high, the LED will be on. Each place there is a low, the LED will be off.

% 1  0  0  1  1  0  0  0

  ●  ○  ○  ●  ●  ○  ○  ○

You have the patience of a saint.

Mike.

 

[For The Popcorn]

You have the patience of a saint.

Mike.

I think mentally deranged is the term you were looking for!

Already on page 10 and we're not even through the opening act!

 

[MrDEB]

post#192 is a really nice schematic.
Now to go hunt for the shift.bas again

 

[MrDEB]

Searched but no SHIFT.bas

 

[Pommie]

Popcorn, I notice that your image above states that the modules are in development. Any later news?

Mike.