Free Project - 245 LED Display

[T.Jackson]

Thanks

Getting back to the clock for a moment - I've had it running for 24hrs so far and its gained 3 secs. Anyone have any thoughts on how to improve its accuracy?

[precision]

I think use DS1307 or Darrel Taylor's time solution.

[shahidali55]

Converting the display project to a clock was a really nice idea.
I think i will be making it sometime.
About the clock gaining 3 sconds in 24hrs, using Darrels's instant Interrupts system will keep it within 0.5 sec a day.
I've tried making clocks with the PBP interupt system but i faced the same accuracy problem.

[GioppY]

Thanks

Getting back to the clock for a moment - I've had it running for 24hrs so far and its gained 3 secs. Anyone have any thoughts on how to improve its accuracy?

Adjust the oscillator frequency! 3 sec/day means 34 ppm; that sounds reasonable for an unadjusted oscillator.
Or change the divisor rate from the nominal 31250/4096 to a value who meet the actual frequency.

Regards
Gianni

[Dan Cata]

Dear Trent, can't you at least post a big rezolution picture of the circuit's pcb, of the logical part, not of the led's? 10q

[T.Jackson]

Dear Trent, can't you at least post a big rezolution picture of the circuit's pcb, of the logical part, not of the led's? 10q

I HAVE posted a big picture of the PCB with more than adequate resolution. See post #15 http://www.picbasic.co.uk/forum/atta...4&d=1177471027

[Dan Cata]

I HAVE posted a big picture of the PCB with more than adequate resolution. See post #15 http://www.picbasic.co.uk/forum/atta...4&d=1177471027

I ment something more like this pic...

[T.Jackson]

Sorry - as I've said before, the PCB artwork isn't available.

[magu]

i made the pcb in orcad layout, but it doesen`t WORK !!! . Tell me the problems... plsssss. And the led should lit when the serials cable+ 5v cable is connected to the board or not? or when the 5v cable is connected?

On the link you can see the board... The caps than are not shown i have reposition them... the picture has made without them...

http://www.zamfirelu.org/led/fata.jpg