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LED Night project

josh_j

Ok so a few months back I posted about this LED night light I'm making for my girlfriend. I decide that instead of getting a bunch of RGB LEDs, I went and bought the Tri-color LED strip instead because it seemed like a idiot proof thing to do. I downloaded the example code for it and it looks great! But here is my trouble, how do I add a dimmer dial to the code?

 

Here is a link to the code.https://github.com/Grid21/_2760339_Program

 

The strip is analog and uses three pins. It plugs into pins GND, VIN and A0 (analog 0) The chip on the strip is a TM1803 chip.

 

I did read over all the .PDF documentation but I still don't understand what I read. If someone here could look at the code, explain to me and then explain how to add a line of code that would use a variable resistor dial to adjust the brightness that would be fantastic! If need be I can also give links to the .PDFs I have on the tri-color LED Strip.

 

Thanks so much for the coming help!
Josh

 

Also could Help me?

Attachments:
image2760339_PM_EN.pdf
imageTM1803.pdf
Parents

  • OK....

     

    Have had a look into the code, and without any hardware this is difficult to test. But here goes...

     

    add the following code into the 'send_1M_pattern' function just ABOVE the 'send_strip(temp_data)' line.

     

    // Convert Hex to seperate RGB Values

    long r=(long)(temp_data>>16);

    long g=(long)(r>>8);

    long b=(long)temp_data;

     

    // Apply multiplication factor for brightness

    r = (float)r * (a_val/1024.0);

    g = (float)g * (a_val/1024.0);

    b = (float)b * (a_val/1024.0);

     

    // Convert RGB values back to Hex

    long temp_data = ((long)r << 16) | ((long)g << 8 ) | (long)b;

     

     

     

     

     

     

    This code will apply a scaling factor to the output dependent on the value of variable 'a_val' this value should be set through an AnalogueRead on the pin connected to your variable resistor. This AnaglogRead instruction can be added just ABOVE the 'for (i=0;i<pattern_no;i++)' line so that the analogue value is not being polled continuously during the loop.

     

     

    Let me know how you get on.

Reply

  • OK....

     

    Have had a look into the code, and without any hardware this is difficult to test. But here goes...

     

    add the following code into the 'send_1M_pattern' function just ABOVE the 'send_strip(temp_data)' line.

     

    // Convert Hex to seperate RGB Values

    long r=(long)(temp_data>>16);

    long g=(long)(r>>8);

    long b=(long)temp_data;

     

    // Apply multiplication factor for brightness

    r = (float)r * (a_val/1024.0);

    g = (float)g * (a_val/1024.0);

    b = (float)b * (a_val/1024.0);

     

    // Convert RGB values back to Hex

    long temp_data = ((long)r << 16) | ((long)g << 8 ) | (long)b;

     

     

     

     

     

     

    This code will apply a scaling factor to the output dependent on the value of variable 'a_val' this value should be set through an AnalogueRead on the pin connected to your variable resistor. This AnaglogRead instruction can be added just ABOVE the 'for (i=0;i<pattern_no;i++)' line so that the analogue value is not being polled continuously during the loop.

     

     

    Let me know how you get on.

Children
  • in reply to gadget.iom

    Now where do I wire that variable resistor? Also could you explain how do I create a slow fade to the colors? I'm so new at this that I will need help in this coding.

  • in reply to gadget.iom 

      {
    send_1M_pattern(pattern_test_rainbow, 10, 70);
  }




  /*
  frame++;
    if(frame<=10) LEDSTRIP_PATTERN_0();
    if(10<frame<=20) LEDSTRIP_PATTERN_0();
    if(20<frame<=30) LEDSTRIP_PATTERN_0();
    if(frame>30) frame=1;
   */
  //delay(1);
}




/*******************************************************************************
 * Function Name  : send_1M_pattern
 * Description    : Transmit pattern to whole 1 meter strip
 *                  
 * Input          : pointer to ROM pattern; pattern length; frame rate
 *                  
 * Output         : None
 * Return         : None
 *******************************************************************************/
void send_1M_pattern(const unsigned long data[][10], int pattern_no, int frame_rate)


{
  int i=0;
  int j=0;
  uint32_t temp_data;


  for (i=0;i<pattern_no;i++)
  {
    noInterrupts();
    for (j=0;j<10;j++)
    {
      // Convert Hex to seperate RGB Values
     long r=(long)(temp_data>>16);
     long g=(long)(r>>8);
     long b=(long)temp_data;

    // Apply multiplication factor for brightness
    r = (float)r * (a_val/1024.0);
    g = (float)g * (a_val/1024.0);
    b = (float)b * (a_val/1024.0);

// Convert RGB values back to Hex
long temp_data = ((long)r << 16) | ((long)g << 8 ) | (long)b;
      temp_data=pgm_read_dword_near(&data[i][j]);
      send_strip(temp_data);
    }
    interrupts();


    delay(frame_rate);


  }

     

    I wasn't sure where exactly to put it but when I did what you said to do I got this error.

     

    "Tri_Strip_Brightness.ino: In function 'void send_1M_pattern(const long unsigned int (*)[10], int, int)':

    Tri_Strip_Brightness:226: error: 'a_val' was not declared in this scope"

  • in reply to josh_j

    Try moving the line "temp_data=pgm_read_dword_near(&data[i][j]);" above the code I sent you.