Arduino + Serial dat

Beginners
,
1

Hello fellow TD gurus,
I’ve got some problems sending data from Touchdesigner to the Arduino IDE. My project is about controlling WS2811 LEDs using TD. I’m trying to send <“led_nr” , “color_r” , “color_b” , “color_g”> trough a single line serial message. But somehow only the first value is gotten by the IDE.

Here is the .py file from TD, wich is executed at every frames start:

nr = op('led_nr').par.value0
red = op('red_value').par.value0
green = op('green_value').par.value0
blue = op('red_value').par.value0

op('serial1').send('<', nr, red, blue, green, '>' , terminator="\n")

And here is the Arduino project file:

#include <FastLED.h>

//Serial comm setup: 
const byte numChars = 32;
char recievedChars[numChars];
char tempChars[numChars];

//Data got from serial
int led_nr;
int r_val;
int g_val;
int b_val;

boolean newData = false;

// How many leds in your strip?
#define NUM_LEDS 120

#define DATA_PIN 7

// Define the array of leds
CRGB leds[NUM_LEDS];

void setup() { 
     Serial.begin(9600);
     Serial.println("Please close this serial window in order to use it with TD");
     Serial.println();
     FastLED.addLeds<WS2811, DATA_PIN, GRB>(leds, NUM_LEDS);
}

void loop() {
    recvWithStartEndMarkers();
    if (newData == true){
      strcpy(tempChars, recievedChars);
      parseData();
      showParsedData();
      leds[led_nr] = CRGB(r_val,g_val,b_val);
      FastLED.show();
      newData = false;
      }
}

void recvWithStartEndMarkers() {
  static boolean recvInProgress = false;
  static byte ndx = 0;
  char startMarker = '<';
  char endMarker = '>';
  char rc;

  while(Serial.available() > 0 and newData == false){
    rc = Serial.read();
    if(recvInProgress == true){
      if(rc != endMarker){
        recievedChars[ndx] = rc;
        ndx++;
        if(ndx >=numChars){
          ndx= numChars-1;
        }
      }
      else {
        recievedChars[ndx] = '\0';
        recvInProgress = false;
        ndx = 0;
        newData = true;
      }
    }
    else if(rc == startMarker){
      recvInProgress = true;
    }
  }
}

void parseData(){
  char * strtokIndx;
  strtokIndx = strtok(tempChars,",");
  led_nr = atoi(strtokIndx);

  strtokIndx = strtok(NULL,",");
  r_val = atoi(strtokIndx);

  strtokIndx = strtok(NULL,",");
  g_val = atoi(strtokIndx);
  
  strtokIndx = strtok(NULL,",");
  b_val = atoi(strtokIndx);
}

void showParsedData(){
  Serial.print("Led nr.: ");
  Serial.print(led_nr);
  Serial.print("  ");
  Serial.print("Color: ");
  Serial.print(r_val);
  Serial.print(",");
  Serial.print(g_val);
  Serial.print(",");
  Serial.print(b_val);
  Serial.println();
  Serial.print("");
}

Thanks in advance!

2

Hi there,
I’m not in front of a computer right now, but perhaps you should consider checking the www.alltd.org website, and search for “arduino”.
There are quite few tutorials on sending serial to arduino, as well controlling led pixels.
I hope it helps!