Free Project - 245 LED Display

[skimask]

Tell me pls a the possible problem that the board doesen`t work. I connect the entire wires to the pics and capacitor, diodes and rezistors; i change the pic over 3 times, the eeprom 2 times but doesen`t work... i sincerily i need some help.

We all 'sincerily' need help...but...100,000+ different things can cause this to fail...
Wiring faults (go over 100 times and you still miss that ONE wire that's wrong, programmer faults, etc.etc...
But for one...I see the cap's in the cluster still haven't moved nearer to the chips like suggested earlier!!!

[magu]

tell me pls what capacitor do i ha\ve to place and where?

[T.Jackson]

tell me pls what capacitor do i ha\ve to place and where?

The caps are the least of your worry. What about the LEDs? You've used common diffused 5mcd types, these won't be bright enough. I clearly made mention of this several times in the article and on the schematic. Unfortunately, I feel, you've bitten off more than you can chew.

[magu]

Those are the steps that i should follow?

1. Install Visualbasic
2. Connect the board to 5v and 12v
3. Connect the serial port to board
4. Start VB program (programing the eeprom)
5. Push the program button (the led should stay litghing?)
6. Program the eeprom from VB program
Those steps are good?

[T.Jackson]

Yes - sounds about right.

[magu]

but the problem is that the led doesn`t stay on (lighting). you know what the cause is?

[T.Jackson]

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.