Single function to receive multiple values

Cloud
1

Hi there,

I’ve not gotten buch luck with getting ArtNet working, so am falling back onto the original plan, the Cloud API.

I’ve found the Simple-Spark-Core-Controller (which I believe @BDub put together) to be extremely helpful, and can get it successfully talking to the :spark: :smiley:

I was hoping I could go one step further – rather than having to have duplicate functions reside on the Spark Firmware, I was hoping to be have code on the Firmware which receives three values, separated by commas, and then writes these values to an output.

ie: 098,183,204 would get parsed and send value 098 to A5, 183 to A6, and 204 to A7.

Here’s the code I’ve got so far, but it’s not doing what I want. I’ve tested it and it just seems to grab the integer in its physical location instead of its CSV grouping.

int rgbstrip(String command)
{
    // Convert received string to RGB values
    String r = command.substring(1);
    int rval = r.toInt();
    
    String g = command.substring(2);
    int gval = g.toInt();
    
    String b = command.substring(3);
    int bval = b.toInt();

    // Write values to outputs
    analogWrite(red, rval);
    analogWrite(green, gval);
    analogWrite(blue, bval);

    // Return response
    return 1;
}

Any advice would be appreciated :smile:

(Once I’ve got this working, I just need to figure out how to get the value to “fade”. For example, if the value on a pin started at 200 and needs to get to 10, I want it to gradually dim. If anyone has a lightweight way of doing this, I’d also be interested to know.)

2

@Jeff, I suppose you are trying to set color of RGB Led, below is the code I used to parse and set the color for my BlinkM project.

int r, g, b;
char szArgs[13];

command.toCharArray(szArgs, 12);

sscanf(szArgs, "%d,%d,%d", &r, &g, &b);

analogWrite(red, r);
analogWrite(green, g);
analogWrite(blue, b);
4 Likes
3

That worked perfectly @krvarma! Thanks so much!

Now I just need to find out how to make the colour fade from the old to the new and the code will be complete :smile:

4

@Jeff, a poor man’s version is like this, you can introduce more complicated formula to get realistic fades

float oldr;
float oldg;
float oldb;

float newr;
float newg;
float newb;

float cr = oldr;
float cg = oldg;
float cb = oldb;

int steps

float rstep = (newr - oldr) / steps;
float gstep = (newg - oldg) / steps;
float bstep = (newb - oldb) / steps;

for(int i=0; i<steps; ++i){
    cr += rstep;
    cg += gstep;
    cb += bstep;
}
1 Like