led matrix pic 16f84 and 4017 help me please

[Mus.me]

This is the schematic,i need help how to drive this ti write scroling text ,thank u

[mackrackit]

I do not think the pulsout command is going to work for you, maybe a series of them?

This may help you.
http://delabs-circuits.com/cirdir/th.../doc00020.html

[Archangel]

Hello Mus.me,
Here is basically what you do, get some graph paper, lay out 5x9 squares on the paper, and create the characters you want to display. The sides will have a binary value. I use the Port side (the PIC side) as the port output value. I use 8x8 displays as it is easier. the character " 0 " would be comprised of a row value $7e, followed by 3 rows of $81 and finally $7e again. Make up 5 lookup tables which execute sequentally and put the 5 bytes of each character in each. That's how to do it.

[Darrel Taylor]

If that's a CD4017, then it can only source about 0.36 ma @ 5V. That's not enough to drive 1 LED, let alone 5.

If it's a 74HC4017, then it can drive 25 ma. Good enough for 1, maybe 2 LED's, or 5 DIM ones.

Some transistors or darlingtons would help.
You might want some resistors in series with the 5 cathodes too.
<br>

[Mus.me]

If that's a CD4017, then it can only source about 0.36 ma @ 5V. That's not enough to drive 1 LED, let alone 5.

If it's a 74HC4017, then it can drive 25 ma. Good enough for 1, maybe 2 LED's, or 5 DIM ones.

Some transistors or darlingtons would help.
You might want some resistors in series with the 5 cathodes too.
<br>

thank u for reply i know that ,but i wanted to know how i write the pulse to 4017 ,i will change the schematic and i take off tc4017 and i use 8x5 led matrix it will be easy to drive anyway thank you Darrel Taylor & joe S & Mackrackit for helping me .

[Darrel Taylor]

... ,but i wanted to know how i write the pulse to 4017 ...

OK, so let's take a look at the PULSOUT command.
There's really nothing wrong with your original statement, which is why we were avoiding the question.

pulsout portb.0,150

The pulsout line above will toggle the pin twice, giving an effective "Pulse". The 4017 will count on the "Rising Edge" of the pulse.
The time between the Toggles would be 150 * 10us = 1500us = 1.5ms. (assuming 4mhz OSC)

1.5ms is extremely long for this purpose. But it would still work.
pulsout portb.0,1 with a 10us pulse would work just as well.
However, the 4017's can take a pulse width as small as 100ns (.1us) so you don't really need PULSOUT.
Simply toggling the pin with HIGH and LOW will do the job too.

HIGH PORTB.0
LOW  PORTB.0

Another thing to do is turn OFF all LED's before the pulse. Otherwise the 5 LED pattern will briefly show on 2 rows, giving a ghosting effect.

PORTA = %11111   ; ALL LED's OFF
HIGH PORTB.0
LOW  PORTB.0
porta = %10010   ; new pattern

Cheers,

[Mus.me]

thank u Darrel Taylor for helping me,i have another quetion, i,m using proteus 7.5, for testing my project but it seems not working good is there any other programe to test projects?