P10 board not working

Other Hardware LEDs and Multiplexing
1

I am making a project using p10 LED BOARD and i am trying to test it.I uploaded the code to my adruino uno and the board works fine with adruino uno supply.As soon as i supply 5 volt the display stops working or sometimes flickers two three leds brightly and goes off..




#include <SPI.h>
#include <DMD.h>
#include <TimerOne.h>
#include "SystemFont5x7.h"
#include "Arial_black_16.h"
#include "Arial14.h"

char b[8];
String str;
#define DISPLAYS_ACROSS 1
#define DISPLAYS_DOWN 1
DMD dmd(DISPLAYS_ACROSS, DISPLAYS_DOWN);

void ScanDMD(){
dmd.scanDisplayBySPI();
}

void setup() {
Serial.begin(9600);
Timer1.initialize(5000);
Timer1.attachInterrupt(ScanDMD);
dmd.clearScreen(true);
}

void loop()
{
  int slen=0;
  dmd.selectFont(Arial_Black_16);
  str = "welcome to Sikkim ";
  slen = str.length()+1;
  str.toCharArray(b, slen );
  dmd.drawMarquee( b, slen, (32*DISPLAYS_ACROSS)-1 ,1);
  unsigned long timing  = millis();
  boolean flag = false;
  while (!flag)
  {
	if ((timing + 70) < millis())
	{
  	flag = dmd.stepMarquee(-1, 0);
  	timing = millis();
	}
  }
}
2

You did not connect the green wire.

3

This reads like you are using the Arduino 5v pin to power the P10. You should not.

You have the power supply connections backwards or are using the Arduino as a power supply.

4

I am using a charger which outputs 5volts of power.
What foes backwards flow means??
All the connections are verified multiple times too

5

Ok.

6

What does "Arduino uno supply" mean?

How did you "supply 5 volt" ? To the matrix or to the Arduino? To which pins?

7

From the charger which outputs 5 volts..

8

If you don't want to cooperate, do not waste your and others time, try to resolve the problem yourself.
Good luck for your project.

9

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