int pState = 0;


void setup() {
  // put your setup code here, to run once:
  pinMode(10,OUTPUT);
  pinMode(A0, INPUT);

  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  pState = analogRead(A0);
Serial.println(pState);

  if (pState >= 128) {
    digitalWrite(10, HIGH);
  }
  else {
    digitalWrite(10, LOW);
  }
}