Tlc5940 fading question

Projects Programming
1

Hello,

So I love the TLC5940 and I decided to try something that I haven't done before. Govern the fade value by using equations. I am using RGB Leds and they are connected to the TLC5940 and I have differentiated the pins by color and then given each color its own equation. The equations shouldn't be exceeding 255.
Here is my code.

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

int Red[] = {4,7,10,13,16};
int Blue[] = {2,5,8,11,14};
int Green[] = {3,6,9,12,15};

int Rval = 127*sin(millis()) + 127;
int Gval = 127*sin(millis()/2)+127;
int Bval = 127*sin(millis()/3)+127;


TLC_CHANNEL_TYPE channel;

void setup()
{
  Tlc.init();
}

void loop()
{
  int instR1 = Rval;
  int instG1 = Gval;
  int instB1 = Bval;
  delay(50);
  int instR2 = Rval;
  int instB2 = Bval;
  int instG2 = Gval;
  
  int start = millis()+50;
  int end = start + 1000;
  for (int i = 0; i<5; i++)
  {
    tlc_addFade(Red[i],instR1,instR2,start, end);
    tlc_addFade(Blue[i],instB1,instB2,start,end);
    tlc_addFade(Green[i],instG1,instG2,start,end);
    tlc_addFade(Red[i],instR2,instR1,start,end);
    tlc_addFade(Blue[i],instB2,instB1,start,end);
    tlc_addFade(Green[i],instG2,instG1,start,end);
    Tlc.set(0,255);
  }
 tlc_updateFades();
 instR1 = 0;
 instG1 = 0;
 instB1 = 0;
 instR2 = 0;
 instB2 = 0;
 instG2 = 0;
}

Now the issue that i'm having is the colors aren't changing at all. They have a color and they are just chilling in that same color even though I have the functions being changed in the loop.

Anybody got an idea whats going on?

2

This only happens once. When the program initializes, these "equation" are calculated and stored in Rval, GVal, and Bval.

int Rval = 127sin(millis()) + 127;
int Gval = 127sin(millis()/2)+127;
int Bval = 127*sin(millis()/3)+127;

They will never change after this.

So later when you assign Rval to something, it is this pre-determined calculated value that gets stored. If you want to calculate them in your loop with millis() changing, you must do the calculation again.

3

so I would just have to set it equal to the equation again?

4

Yes, you must do the calculation each time one of its variables change.

5

Okay, its working now!
thank you.

6 
int Rval = 127*sin(millis()) + 127;

The sin() function takes a value in radians, not a time.

7

I don't need a specific value, I just need a value that can change each time I run it. It works fine.