int readpin = A1;
int resultpin = 13;
int v2 = 0;
float result = 0;
int delayinms = 50;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(readpin, INPUT);
  pinMode(resultpin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  v2 = analogRead(readpin);
  result = v2 * 5.0 / 1024;
  if(result >= 2.5){
    digitalWrite(resultpin, HIGH);
  }
  else{
    digitalWrite(resultpin, LOW);
  }
  Serial.println(result);
  delay(delayinms);
}