Results

1st calculation to adhere in this project was suitable resistor value for current driver circuits.
It was done by simply applying ohm’s law.

V(Vout)-V(Adj) = 1.2V
Optimum current value for single LED     = 20×10-3A (20 mA)
Hence Resistor value for current driver     = 1200/20 Ω
= 60 Ω

There are no standard 60Ω resistors. then most suitable was 56Ω.
Current through the LED @ 56Ω applied resistor = 1200/56 mA
= 21.42 mA

If ICSP taking 50mA at working + current driver taking maximum of around 170 mA + PIC’s working current + column driver circuit’s current consumption = not exceeding 500mA

So it was ok to apply single LM7805 voltage regulator for whole circuit as it was not exceeding the level of 1A.
And it is advisable to use 500mA transformer with 230V to 12V. Power supply design was also ok.
Then biggest problem was when PIC was attached after programming, there was no enough current through LED’s and voltage also dropped. Second thing is it was floated.

Then all current drivers were checked for their consistency. And then check the voltage values at PIC PORTB outputs….and voltage inputs. Problem was, no considerable voltage was not found yet. Then checked for the crystals activity and it was ok.

Then checked for whether MCLR was supplied the high voltage value… then got the error it was not made to high voltage value (+5v). After that LED columns were checked for connectivity. Errors identified and hardware was recovered.

Now LED circuit and PRO ROW circuit was ok. Then the other circuit misbehaved when PORTA was programmed. Connectivity mistake again was identified. In 4017 ICs reset pin is 15th and clock is 14th. Connection interchanged carefully.
Now the major problems of circuit were recovered up to some extent.

Conclusions

There was a major error on this hardware design. When using 4017 as Johnson counter to multiplex a line, it is recommended to leave the Q0 output (pin3). Because of according to its data sheet it stated that when clock inhibit was grounded regardless of clock and reset then Q0 was activated. I made a big mistake as I already have used this function to check compatibility of CMOS4017 and TTLPIC.

So, for a design like this if one who going to make more than 10 columns using 4017 counter please make sure that better to leave pin #3.  Otherwise, designer will be at a big trouble.

It is wiser to use single IC for single 8×8 matrix. Then it will be easy to debug errors.(leaving pin3 and pin11). There can be more method to overcome these failures.

Another thing is when clock inhibit was grounded only clock determines the counting. So that, IC addressing is also be disabled. So it is wise to use that pin also.

And when using high speed crystal and high speed scanning ratio, it is wise to increase the current to LEDs by decreasing resistor value at current drivers. When high speed clocking is used, the LEDs lit only for a very small time interval so that it is more chance to increase the current through as it has low probability to burn out. Then there can be achieved more brightness for LEDs.
Finally, better to use standard code delays which are correspond to crystals

Further Enhancements

enhancements above designed device was monochromatic LED display(RED). but this can be further developed to more colors. there are bi-color LED matrix and RGB LED matrix devices in market.

for example,
if i used another 8 I/O pins to control another 8 anodes… with using bi color (green and red) LED matrices, it can be more beautiful.
RED
GREEN
ORANGE(RED n GREEN simultaneously).

fig 17: a tri-color LED Display

Appendix A – Schematic Diagrams

Pro Row

fig 18: Schematic diagram for pro row

Pro Column

Pro LED