controling tlc5940

Projects Programming
1

hey EVeryone, i need some help with this code, i am trying to fade some LED's connected to the TLC5940, i want only fade one LED at a time in a random fashion, but what i get is many leds fading in a random fashion. what am i doing wrong.

Please any help will be appreciated.

#include "Tlc5940.h"
#include "tlc_fades.h"

int l = random(0,16);

void setup()
{
  Tlc.init();
  randomSeed(analogRead(0));
}

void randomled(int m)
{

  Tlc.clear();
  for (int i=0; i<m; i++)
  {
  
      uint16_t duration = 4000;
      uint32_t startMillis = millis() + 50;
      uint32_t endMillis = startMillis + duration;

      tlc_addFade(l, 0, 4096, startMillis, endMillis);          // fade in
      tlc_addFade(l, 4096, 0, endMillis, endMillis + duration); // fade out
      
      tlc_updateFades();
  

   }
     
}

void loop()
{
    randomled(100);      
}
2

It's not obvious to me what the issue is. The for loop is a bit of a mystery though - why is it there? Try this version & see if it helps:

#include "Tlc5940.h"
#include "tlc_fades.h"

int l;

void setup()
{
  Tlc.init();
  randomSeed(analogRead(0));
}

void randomled()
{

  Tlc.clear();
   uint16_t duration = 4000;
   uint32_t startMillis = millis() + 50;
   uint32_t endMillis = startMillis + duration;
   tlc_addFade(l, 0, 4096, startMillis, endMillis);          // fade in
   tlc_addFade(l, 4096, 0, endMillis, endMillis + duration); // fade out
   tlc_updateFades();   
}

void loop()
{
l = random(0,16);
randomled();
delay(4500);      
}