int analogPin = 0;
int raw = 0;
int Vin = 5;
float Vout = 0;
float R1 = 1000;
float R2 = 0;
float buffer = 0;

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

void loop(){
  raw = analogRead(analogPin);
    //if(raw){
        buffer = raw * Vin;
            Vout = (buffer)/1023.0;
                buffer = (Vin/Vout);
                    R2= R1 * buffer;
                        Serial.print("Raw: ");
                            Serial.println(raw);
                                Serial.print("R2: ");
                                    Serial.println(R2);
                                        delay(1000);
                                          }