ShiftPWM support topic. Latest update: Schematics, high power LED's, LED strips

Using Arduino LEDs and Multiplexing
274

Hi there!
I'm just trying around with my first Arduino Project, but I have some flickering with the ShiftPWM-Lib.
I use 4 74HC595B1 Shift Registers to control about 10RGB-LED-Stripes. The 10th Stripe has about 1m distance to the breadboard/arduino.
I don't use mosfets, but some ULN2001A to power the Stripes.

Here is my code so far:

const int ShiftPWM_latchPin=8;
const bool ShiftPWM_invertOutputs = false; 
const bool ShiftPWM_balanceLoad = false;

#include <ShiftPWM.h>   // include ShiftPWM.h after setting the pins!
unsigned char maxBrightness = 255;
unsigned char pwmFrequency = 100;
int numRegisters = 4;
int numRGBleds = int(numRegisters*8/3)-1;
int iDelay = 5;

void setup(){
  Serial.begin(9600);
  Serial.println("---------------");
  Serial.println("Reset / Start");
  Serial.println("---------------");

  // Sets the number of 8-bit registers that are used.
  ShiftPWM.SetAmountOfRegisters(numRegisters);

  // SetPinGrouping allows flexibility in LED setup. 
  // If your LED's are connected like this: RRRRGGGGBBBBRRRRGGGGBBBB, use SetPinGrouping(4).
  ShiftPWM.SetPinGrouping(1); //This is the default, but I added here to demonstrate how to use the funtion

  ShiftPWM.Start(pwmFrequency,maxBrightness);

  // Print information about the interrupt frequency, duration and load on your program
  ShiftPWM.PrintInterruptLoad();
  ShiftPWM.SetAll(0);
  Serial.print("Maximum Brightness: ");
  Serial.println(maxBrightness);
  Serial.print("Delay is set to: ");
  Serial.print(iDelay);
  Serial.println("ms.");
  Serial.print("Calculated RGB-LEDs: ");
  Serial.println(numRGBleds);
  Serial.println("---------------");
}


void loop()
{ 
  ShiftPWM.OneByOneFast();
}

I also made a Video some weeks ago:

There you can see that the last Stripes are flickering / react too early. In natura it's even worse :frowning:

I hope you can reproduce my problem and maybe could help me :slight_smile:

Sorry for my (very) bad english and greetings from Germany,
Horst