Need help with loop time/interrupt programming

Projects Programming
12

Ok, I was able to find an easy fix with the rollover issue using the working code I posted earlier:

unsigned long T1, T2;
unsigned long lastPressureTime, lastPrintTime;

int loopCounter;

void setup()
{
  Serial.begin(115200);

  T1 = 20;
  T2 = 1000;
  lastPressureTime = 0;
  lastPrintTime    = 0;
  loopCounter      = 0;
}

void loop()
{
  if (millis() >= lastPressureTime + T1) // loop 50 times per second
  {
    lastPressureTime += T1;

    loopCounter++;
  }  

  if (millis() >= lastPrintTime + T2) // print every second
  {
    lastPrintTime += T2;

    Serial.println(loopCounter); 
    loopCounter = 0;
  }  
}

The output for every second I get is this:

50
49
51
50
49
51
50
49
50
51
50
49
51
50
49
51
50

It should output a constant 50 but it doesn't. Any idea why that is?