// start of macros dbg and dbgi
#define dbg(myFixedText, variableName) \
  Serial.print( F(#myFixedText " "  #variableName"=") ); \
  Serial.println(variableName);
// usage: dbg("1:my fixed text",myVariable);
// myVariable can be any variable or expression that is defined in scope

#define dbgi(myFixedText, variableName,timeInterval) \
  do { \
    static unsigned long intervalStartTime; \
    if ( millis() - intervalStartTime >= timeInterval ){ \
      intervalStartTime = millis(); \
      Serial.print( F(#myFixedText " "  #variableName"=") ); \
      Serial.println(variableName); \
    } \
  } while (false);
// end of macros dbg and dbgi

const byte row1 =  12;
const byte row2 =  11;
const byte row3 =  10;
const byte row4 =   9;
const byte row5 =   8;

#define OFF LOW
#define ON  HIGH

unsigned long myFastCounter;

unsigned long MyTestTimer = 0;                   // variables MUST be of type unsigned long


//helper-function for non-blocking timing
boolean TimePeriodIsOver (unsigned long &periodStartTime, unsigned long TimePeriod) {
  unsigned long currentMillis  = millis();  
  if ( currentMillis - periodStartTime >= TimePeriod )
  {
    periodStartTime = currentMillis; // set new expireTime
    return true;                // more time than TimePeriod) has elapsed since last time if-condition was true
  } 
  else return false;            // not expired
}


int blinkState;

void setup() {
  Serial.begin(115200);
  Serial.print( F("\n Setup-Start  \n") );

  pinMode(row1,OUTPUT);
  pinMode(row2,OUTPUT);
  pinMode(row3,OUTPUT);
  pinMode(row4,OUTPUT);
  pinMode(row5,OUTPUT);

  digitalWrite(row1,OFF);
  digitalWrite(row2,OFF);
  digitalWrite(row3,OFF);
  digitalWrite(row4,OFF);
  digitalWrite(row5,OFF);
  blinkState = 1;
}


void loop() {
  myFastCounter++;
  // loop is running fast but only once per second (1000 milliseconds)
  // the value myFastCounter is printed to the serial monitor
  dbgi("dbgi-demo",myFastCounter,1000);

  // non-blocking timing-function
  // evaluates true only if milliseconds given as the second parameter
  // have passed by
  if (TimePeriodIsOver (MyTestTimer,500) ) {
    blinkState++;

    if (blinkState > 5) {
      blinkState = 1;
    }
    dbg("dbg-Demo",blinkState);
  }
  
  switch (blinkState) {
    case 1: {
      digitalWrite(row1,ON);
      digitalWrite(row2,OFF);
      digitalWrite(row3,OFF);
      digitalWrite(row4,OFF);
      digitalWrite(row5,OFF);
      break;      
    }

    case 2: {
      digitalWrite(row1,OFF);
      digitalWrite(row2,ON);
      digitalWrite(row3,OFF);
      digitalWrite(row4,OFF);
      digitalWrite(row5,OFF);      
      break;      
    }
  

    case 3: {
      digitalWrite(row1,OFF);
      digitalWrite(row2,OFF);
      digitalWrite(row3,ON);
      digitalWrite(row4,OFF);
      digitalWrite(row5,OFF);      
      break;      
    }

    case 4: {
      digitalWrite(row1,OFF);
      digitalWrite(row2,OFF);
      digitalWrite(row3,OFF);
      digitalWrite(row4,ON);
      digitalWrite(row5,OFF);      
      break;      
    }

    case 5: {
      digitalWrite(row1,OFF);
      digitalWrite(row2,OFF);
      digitalWrite(row3,OFF);
      digitalWrite(row4,OFF);
      digitalWrite(row5,ON);      
      break;      
    }  
  }
}