input analog mic output LED

const int SENSOR = A0;
const int LED = 13;

int val = 0;
int max = 0;

void setup() {
  Serial.begin(9600);
  pinMode(SENSOR, INPUT);
  pinMode(LED, OUTPUT);
}

void loop() {
  val = analogRead(SENSOR);

  if (val > max) {
    max = val;
  }
  
  String space = " ";
  Serial.println(max + space + val);

  if (val > 10) {
    digitalWrite(LED, HIGH);
  } else {
    digitalWrite(LED, LOW);
  }
  delay(20);
}