// https://forum.arduino.cc/t/reading-switch-with-resistors-to-analog-input-break-before-make-issue/1265837
// https://wokwi.com/projects/399305157246238721

void setup()
{
  Serial.begin(115200);
  Serial.println("Jello Whirled!\n");
}

unsigned long now;

void loop() {
  now = millis();

  static unsigned long timer;
  static int oldReading = -1;
  static int stableValue;
  static int oldStableValue = -1;

// debounce

  int newReading = getVal();
  if (newReading && newReading != oldReading) {
    timer = now;
    oldReading = newReading;
  }

  if (now - timer > 500)
    stableValue = newReading;

// transition detect

  if (stableValue && stableValue != oldStableValue) {
    Serial.print("switch has become ");
    Serial.println(stableValue);
    oldStableValue = stableValue;
  }
}

int getVal()
{
  int val = analogRead(A0);

  switch (val) {
  case 0 ... 150 :
    val = 1;
    break;

  case 200 ... 350 :
    val = 2;
    break;

   case 400 ... 550 :
    val = 3;
    break;
 
  case 600 ... 750 :
    val = 4;
    break;
 
  case 800 ... 950 :
    val = 5;
    break;
 
  default :
    val = 0;
    break;
  }

  return val;
}