I am trying to run 2 TCS3200’s from one Arduino Due. Next, I must increase to 4 sensors. I need to read the data from the 2 digital pins but how do I read both within the same loop rather than in series to save time. The code reading one sensor tasoOutPin1 (pin 10) works but why can’t I place the second read command int detectColor(int taosOutPin2) before the { symbol?

int detectColor(int taosOutPin1) {

float white1 = colorRead(taosOutPin1,0,1);
float red1 = colorRead(taosOutPin1,1,1);
float blue1 = colorRead(taosOutPin1,2,1);
float green1 = colorRead(taosOutPin1,3,1);



  • 1
    What happens when you place the second / third / fourth read in? Why doesn't it work?
    – Peter
    Commented Sep 19, 2016 at 22:55
  • Downvoted because you didn't provide enough information for us to help you and you didn't respond to the request for more information.
    – per1234
    Commented Dec 20, 2016 at 3:25

1 Answer 1


Seems you have to run these serially, but not sure why it's an issue, a due is quick.

seems more programming related... 'detectColor' is a function, and this is run inside the loop i assume.

int taosOutPin1 = 10; //color detector 1
int taosOutPin2 = 2; //Pins are examples, change to actual pin...
int taosOutPin3 = 3;
int taosOutPin4 = 4; //color detector 4

typedef struct {
   float white;
   float red;
   float blue;
   float green;

} color; 

void setup() {
  // put your setup code here, to run once:


void loop() {

color detectedColorForSensor1 = detectColor(taosOutPin1);
color detectedColorForSensor2 = detectColor(taosOutPin2);
color detectedColorForSensor3 = detectColor(taosOutPin3);
color detectedColorForSensor4 = detectColor(taosOutPin4);


//etc for sensor 2,3,4............


color detectColor(int taosOutPin1) {

color detectedColor;

detectedColor.white = colorRead(taosOutPin1,0,1);
detectedColor.red = colorRead(taosOutPin1,1,1);
detectedColor.blue = colorRead(taosOutPin1,2,1);
detectedColor.green = colorRead(taosOutPin1,3,1);

return detectedColor;


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