int pinread = A2;
int pinled = 5;
float valread = 0;



void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(pinread, INPUT);
  pinMode(pinled, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  valread = analogRead(pinread) * 5. / 1023.;
  Serial.println(valread);
  delay(100);

  if (valread > 2 )
  {
    digitalWrite(pinled, HIGH);
  }

  else
  {
    digitalWrite(pinled, LOW);
  }

}