int led_pin = 10;
int threshold = 500;
int button_value;

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

void loop(){
  button_value = analogRead(A1);
  threshold = analogRead(A0);

  if(button_value >= threshold){
    digitalWrite(led_pin, HIGH);
  }else{
    digitalWrite(led_pin, LOW);
  }
}