Measuring time

[coderatchance]

Hello all!

I would like to measure the time:

//other stuff omitted
//TIMER
unsigned long currentTime;
unsigned long startTime;

setup(){
// printing, etc omitted.

// start time
  startTime = millis();

}

loop(){

currentTime = millis();
Serial.print( myPWM() );
Serial.println();

}

byte myPWM() {

  static byte m;

  for (byte i = 0; i < 20; i++) {
    if ( (Data2 > myHT_L[i])   ) {
      m = myPWMval[i];
    }
  }
  return m;
}

Data2 is a number that may at some point go above or below the numbers that are stored in the myHT_L[].
The above code works well, however, I am not sure how to add the measurement of time?
For example, I would like only to return the number after the Data2 is above the myHT_L[i] e.g. 100ms.
I have started to put the code together, something like this,

byte myPWM() {

  static byte m;

  for (byte i = 0; i < 20; i++) {

    if ( (Data2 > myHT_L[i])  && (currentTime - startTime > 100) ) {

     m = myPWMval[i];
     startTime = currentTime;

    }
  }
  return m;
}

but it does not do the job. Wondering where I am getting it wrong?
Is the problem in the for loop, however, without time works just fine... hmm

Any ideas, help much appreciated.

Best.

[coderatchance]

Updating the code, did correct the problem, it works now, however, it does not cold the values,
I guess this could as well be sorted with another timer?
But where :)

byte myPWM_L() {

  static byte m;

  for (byte i = 0; i < 40; i++) {

    if ( (Data3 > myHT_L[i]) && (currentTimeL - startTimeL > 100)  ) {
      m = myPWMval[i];
    }
    if ( (Data3 < myHT_L[i]) ) {  
      startTimeL = currentTimeL;
    }

  }
  return m;
}

[coderatchance]

Finally found a solution, works well!

  //prototyping R
  for (byte i = 0; i < 20; i++) {

    if (  (Data2 > myHT_R[i] && (currentTimeR - startTimeR >= 220) && Data2 < myHT_R[i + 1]) && (currentTimeR - startTimeR >= 220)  ) {
      n = myPWMval[i];
      startTimeR = currentTimeR;
    }

    if (  (Data2 < myHT_R[i]) && (currentTimeR - startTimeR > 420) && (Data2 > myHT_R[i - 1]) && (currentTimeR - startTimeR > 420) ) {
      startTimeR = currentTimeR;
    }
  }
  //actually PWM values according to the defined PWM in the myPMWval[] !
  return n;
}

So far I am using the for loop function to iterate through the arrays and match the values ...
However, wondering if, it would be smarter to rather have the number of ifs to catch the values without calling the function with the for loop ? For example, it would instantly iterate in the main loop()?

Best.