Multitask using millis(), interrupts, timealarm() in combination with for() loops

Other Hardware LEDs and Multiplexing
10

Since you didn't post example code to play with, consider the difference between running this program with HOBBLE=true and HOBBLE=false

bool HOBBLE = true;
int NUM = 20;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
}

void loop() {
  if (HOBBLE) {
    for (int ii = 0; ii < NUM ; ++ii) {
      Serial.print(ii);
      Serial.print(" ");
      delay(100);
    }
    Serial.println();
  }
  else // un-HOBBLED
  {
    replacement();
  }
  Serial.print("."); // or other things
}

void replacement() {
  static int ii;
  uint32_t now = millis();
  const uint32_t interval = 100;
  static uint32_t last = 0; // remember for next time
  if (now - last >= interval) {
    last = now;
    Serial.print(ii);
    Serial.print(" ");
    ii += 1;
    if (ii >= NUM) {
      Serial.println();
      ii = 0;
    }
  }
}

and consider these:

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