Proximity Sensor w/o delay()

gistfile1.txt

int sensorPin = 0;
int ledPin = 4;
int ledState = LOW;

unsigned long previousMillis = 0;



void setup() {

  pinMode(ledPin, OUTPUT);
  Serial.begin(115200);
}


void loop() {
  
  int val = analogRead(sensorPin);
  val = map(val, 0, 700, 500, 20);
  val = constrain(val, 20, 500);
  
  Serial.println(val);
  
  long interval = val;
  unsigned long currentMillis = millis();

  if(currentMillis - previousMillis >= interval) {
    
    previousMillis = currentMillis;   
    
    if (ledState == LOW)
      ledState = HIGH;
    else
      ledState = LOW;

    digitalWrite(ledPin, ledState);   
  }
}