Free Project - 245 LED Display

[magu]

The purpose of that LED is to give a visual indication that the PIC is indeed receiving data from the PC. It should toggle on/off with every byte received.
Initially, when the program button is pressed - the LED should be lit, assuming that the TX line from the PC to the PIC is idle (or not connected at all).

After the PIC receives its first byte - the LED should change states. Upon receiving the second, once again changing states. It should continue to do so until the PC has finished programming it. The LED is of little importance and the message that you program should begin to scroll automatically after successful download.

Then tell me a program with o can program the PIC...and tell me pls if it is a setting required when program the PIC

[T.Jackson]

Check this out: http://www.symmttm.com/pdf/NYTimes_T...p_09-30-04.pdf
Atomic clock has accuracy of +/- 1 sec over 30 million years.

[T.Jackson]

I've got some much better accuracy now. Not exactly sure how much - only time will "literally" tell!

Here's what I've done to improve things:

<ul>
<li>TMR0 pre-scaler remains @256</li>
<li>TRM0 always starts with 12 dec (256 x 244) = 62.464 mS</li>
<li>Now, it takes 16 overflows of the timer for 0.999424 S to elapse</li>
<li>This is short of 1 sec by 576 uS</li>
<li>Adding 36 nops to each overflow (36 x 16 = 576 uS) compensates this</li>
<li>The crystal now completely defines accuracy</li>
</ul>

[magu]

Look, I feel for you, believe me I do. I know how trying things can be when you're first starting out, I was once a beginner too! If you're that determine to do this project, then my best advice to you is to get some "real-World" help from someone. Or, alternatively, read a book on electronics and PICs. Put the project aside until you've got some considerable more knowledge under your belt. As I've said before, this isn't a simple straight forward project, unless you've got a PCB for it.

ok, i understand , now i have to make the pcb, connect the rez, cap, crystal, transiztors, then the pics (4017, 74hc08, eeprom), and then program the PIC and see if work...

[T.Jackson]

Why don't you put it off for a while - I'm actually planning on doing a KIT for a similar project to this. (Much, much better circuit that does more than just scroll a message) Plus, everything will mount on one large double sided through hole plated board w/silk screen printing on both sides. It will use 8 LED modules rather than the individual LEDs. Today I found a good source for low-cost PCBs. Basically, at the moment, Im in the "planing phase" of things with it, it'll be at least a year away, I need to save up some funds.

[magu]

Why don't you put it off for a while - I'm actually planning on doing a KIT for a similar project to this. (Much, much better circuit that does more than just scroll a message) Plus, everything will mount on one large double sided through hole plated board w/silk screen printing on both sides. It will use 8 LED modules rather than the individual LEDs. Today I found a good source for low-cost PCBs. Basically, at the moment, Im in the "planing phase" of things with it, it'll be at least a year away, I need to save up some funds.

today i`m making the pcb in orcad layout... and tomorow i will finish this pcb... then i see if it work or not...best regards...