#define SLIDER_PIN A0
#define LED_PIN 2
void setup() {
  pinMode(SLIDER_PIN, INPUT);
  pinMode (LED_PIN, OUTPUT);
  Serial.begin(9600);
}

void loop() {
 Serial.println(analogRead(SLIDER_PIN));
 delay(40);
if (analogRead(SLIDER_PIN) > 512) {

  digitalWrite(LED_PIN, HIGH);
}
  else{
  digitalWrite(LED_PIN, LOW);
}
}