pseudocode for counting up every 3 minutes in OF

count.cpp

void setup(){
  counter=0;
  bCounted=true;
}

void update(){
  //check time progress
  if(ofGetElapsedTimef()- (counter*180) > 180)
    bCounted = false;
  }
  //count up each 3 minutes
  if(bCounted == false){
    counter++;
    bCounted = true;
  }
  
  if(counter%2 == 0) do something;
  else if (counter%2 == 1) do some other thing;
  
}

count.h

int counter;
bool bCounted;