/*
  ============================
   Selfmade For-Loop II
  ============================

   This is an example of a "selfmade" for-loop
   which is usually required where a a non-blocking
   loop is required e.g. to blink an LED

   This is an example of 

   a non-blocking millis() function to blink a LED 
   but counting a variable in a for loop with delay()

   The LED will not blink in the correct timing as the for-loop incl. 
   the delay() blocks loop()

   First Edition 2023-04-02
   ec2021

   Simulation: https://wokwi.com/projects/360902704451617793
   Discussion: https://forum.arduino.cc/t/millis-instead-of-delay-and-loop-instead-of-for-loop/1110044/3

   Changed 2023-07-26


*/

constexpr byte LEDPin = 13;

void setup() {
   Serial.begin(115200);
   pinMode(LEDPin, OUTPUT);
}

unsigned long lastChange = 0;    // Variable to store the time in ms when ledState was changed 
unsigned long delayTime  = 300;  // Delay in [ms] when then next change shall take place 
unsigned long delayCount = 500;

int iMax = 9;

void loop() {

  if (millis()-lastChange >= delayTime){ 
     lastChange = millis();               
     boolean ledState = digitalRead(LEDPin);
     digitalWrite(LEDPin, !ledState); 
   }

  for (int i = 0; i <= iMax;i++){
      Serial.print(i);
      Serial.print("\t"); // prints tabs
      delay(delayCount);  
      if (i == iMax) Serial.println();
   }
}