int analogPin = A5;
int raw = 0;
float Vin = 3.3;
float Vout = 0.0;
float R1 = 1000.0;
float R2 = 0.0;
float buffer = 0.0;

void setup(){
Serial.begin(9600);
}

void loop(){
  raw = analogRead(analogPin);
  if(raw){
    buffer = raw * Vin;
    Vout = (buffer)/1024.0;
    buffer = (Vin/Vout) - 1.0;
    R2= R1 * buffer;
    Serial.print("Vout: ");
    Serial.println(Vout);
    Serial.print("R2: ");
    Serial.println(R2);
    delay(1000);
  }
}