Free Project - 245 LED Display

[skimask]

I don`t have PicBasic Compiler, it`s cost a lots of money.

WTF?
Download MPLAB and learn assembly...or I'll bet that the PBP demo would work for this...or not...

[Pic_User]

..or I'll bet that the PBP demo would work for this...or not...

The PBP demo would work to program enough of a program to test a row or column then the next row or column. A good avenue suggested by fazan83.

Magu I am also beginner.... ...but you ask something that too general and may be too hard for you to chew one shot.
...Then once successful you can start troubleshooting this project why not you try to always on all the row 1st and cascade the counter.

...By doing this you know that your circuit is ok. (power supply, micro and driver is ok)
Then you can start deal with the EEPROM.

Just Try a basic thing 1st once you verified the basic thing works then you go to the harder thing.

Nobody can help you if you just keep ask general thing why it doesn't work.

hear this.... I don’t have do some tests..... No changes in the hex or anywhere else.

I don’t have PicBasic Compiler, it’s cost a lots of money. There it’s Another way to solve this problem ?...

Please read posts from Eng4444 (I sure miss him)

... the schematic posted was wrong... did you mistake on purpose? Were we supposed to guess the error in it?...

Dan Cata, do you think someone would post that much work, just to able to trick people. I guess many do not realize how many hours must have been involved in this project before posting it. Any project even simple ones, has a chance of the equivalent of a “typo”. The more and more circuitry involved cause the chance to be extremely large. Magazines have editors, proofreaders that check for these oversights. Magazines ALL have error pages in the next issue, about errors in the previous issue.

Hi Magu, If you agree, I will help you test your board step by step.
Best regards,
Luciano

Luciano, Thank you for your “seeing the bigger picture”. You have set an example for all of us on the forum. You have the right spirit and we salute you. Your tutorial step by step “trouble shooting” postings will be a great guide for future “new-bies”. These posts show, not only how to methodically, break down the process step by step, but how many steps are involved in the algorithm of “trouble-shooting”. I learned a great deal from your logical process, it is a work of art.

-Adam-

[magu]

it can be a mistake when build the pcb of the board. for those who has the ORCAD Layout Plus i attach the pcb.

[mister_e]

I no longer have ORCAD on my machine, so can you convert it as a .DWG, DXF or gerber 274 or use PrimoPDF to convert it to a PDF?

Primo PDF will act as a printer, so you just need to print the document, but choose PrimoPDF as printer.

Download link: http://www.download.com/3000-10743_4-10660924.html

Nice and free tool

[magu]

the yellow nets are not connected yet because i have to find space...

[Luciano]

Hi Magu,

During our test we have complitely tested the 245 LEDs, 42 Transistors,
and all the ICs listed below and all their connections.

IC3 (complitely tested)
IC4 (complitely tested)
IC5 (complitely tested)
IC6 (complitely tested)
IC7 (complitely tested)
IC9 (complitely tested)

We have also tested these pins and connections of IC1:

RA2 (PIN1) ---- ROW1
RA3 (PIN2) ---- ROW2
RB4 (PIN10) ---- ROW3
RB3 (PIN9) ---- ROW4
RB0 (PIN6) ---- ROW5
RB2 (PIN8) ---- ROW6
RB1 (PIN7) ---- ROW7

RB5 (PIN 11) ---- CD4017 RESET


The rest of the circuit can be tesetd in five minutes with an ohmmeter.

* * *

What about the 12V power supply?

What is the current of the used 12V power supply?
Is the 12V power supply a DC power supply?
Can you post a picture of the 12V power supply?
Can you post a picture of the 5V voltage regulator circuit? (The board).

* * *

Originally Posted by magu:
have realize when do i connect the the power wire without the serial
wire, i press the program button, the led stay lit, but in 5-6 sec stops, and
then again stay lit and on the led display the fisrt led on first ROW and
seond ROW are lit. something is wrong.... but i don`t know what...

This is not possible. With the serial cable disconnected, after you have
briefly pushed the program button, the LED 1 will be lit (ON) forever.
This is because in the program, the PicBasic Pro SERIN command will wait
the character "a" forever. (Note that no timeout is used in SERIN, therefore
the program will wait forever).

This is the line of code that will make the program wait the character "a" forever:

SERIN PORTB.7, N2400, ["a"], DataBuffer

In the program, before the SERIN line, the LED 1 is lit by the following code,
where first the pin is set as output and then the pin is set to LOW.
(Note tha the RA4 sinks current so this is why "0" will lit the LED).

OUTPUT PORTA.4
ActivityLED = 0

* * *

Download the PicBasic Pro demo and write a program that makes the LED 1 blink.
Program the PIC with the HEX file, remove all the ICs from the board and
see if the LED 1 blinks. If you do that, then you will know that the 10 MHz crystal oscillator
works, that your programmer works and that the FUSE bits are correctly set.

The PicBasic Pro demo is limited to 31 lines of source code.
With 31 lines of code you can write a program that will make the LED 1 blink
and you can also write a program that will test any single LED of the board.
If you do that, make sure you use the seven 180 ohm resistors.

Here you can download the demo:
http://www.melabs.com/pbpdemo.htm

Best regards,

Luciano

[magu]

Hi Magu,


* * *

What about the 12V power supply?

What is the current of the used 12V power supply?
Is the 12V power supply a DC power supply?
Can you post a picture of the 12V power supply?
Can you post a picture of the 5V voltage regulator circuit? (The board).

* * *

I use 5V from the power supply of the computer for both the diaply and the board.. If it necesary i can make the 5v voltage regulator circuit.