const int analogPin = 4;
const int LED1 = 18;
const int LED2 = 19;
int val = 0;

void setup() {
  Serial.begin(9600);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
}

void loop() {
  val = analogRead(analogPin);
  if (val > 2047) {
    digitalWrite(LED1, HIGH);
    digitalWrite(LED2, LOW);
  } else if (val < 2047) {
    digitalWrite(LED1, LOW);
    digitalWrite(LED2, HIGH);
  } else {
    digitalWrite(LED1, LOW);
    digitalWrite(LED2, LOW);
  }
  Serial.print("val = ");
  Serial.println(val);
  delay(500);
}