led matrix pic 16f84 and 4017 help me please

[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.
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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?

[mackrackit]

What would be wrong with doing it the old fashion way?

A bread board, some wires and parts. Then the only thing
to worry about maybe is some stray capacitance.

[Archangel]

. . . . . .my project but it seems not working good is there any other programe to test projects?

Hello Mus.me,
The " code snippet" you posted . . . is that all of it or is there more? I ask because you made no mention of TRISA or TRISB, and those registers tell the PIC to make the ports inputs or outputs, also check your data sheet for that PIC because most of this series have open collector outputs on PortA.4 . I do not see config statements or OSC Define either.

[Mus.me]

Hello Mus.me,
The " code snippet" you posted . . . is that all of it or is there more? I ask because you made no mention of TRISA or TRISB, and those registers tell the PIC to make the ports inputs or outputs, also check your data sheet for that PIC because most of this series have open collector outputs on PortA.4 . I do not see config statements or OSC Define either.

ok joe in know to how to config them i think

define osc 4
porta = 0
trisa = 0
portb = 0

i did everythings but to debug in protues it doesnt work good ex: porta.0 isnt sending data out in proteus so im lookin if there is any other software like proteus to debug my code ,ICD doesnt include f84 and many PICs,i did pic simulator but i didnt understand it so proteus is easy but it seems not doing good job and very slow ,thank u joe for helping me ..

[wellyboot]

define osc 4
porta = 0
trisa = 0
portb = 0

this as well:
trisb = 0

porta = %10010
pulsout portb.0,150
pause 10
porta = %11001
pulsout portb.0,150
so on .......

Maybe worth changing the 'pause 10' to 'pause 1' if your display is flickering.

does your 4mhz crystal have 2 caps (18 - 22pf) between each leg and ground?
not shown on your diagram.

[Mus.me]

this as well:
trisb = 0




Maybe worth changing the 'pause 10' to 'pause 1' if your display is flickering.

does your 4mhz crystal have 2 caps (18 - 22pf) between each leg and ground?
not shown on your diagram.

thank u wellyboot for explaining, and thanks everyone trying to help ,,, i will do it and i post the result ........