#define MAX_VOLTAGE 5.0
#define POT_RESISTANCE 10000.0
#define MAX_ANALOG_VALUE 1023.0
#define POT_PIN A0
#define DELAY 500

void setup() {
  pinMode(POT_PIN, INPUT);
  Serial.begin(9600);
}

void loop() {
  static uint32_t timer = millis();
  int analogValue = analogRead(POT_PIN);
  float voltage = analogToVoltage(analogValue);
  float resistance = voltageToResistance(voltage);
  if((millis() - timer) >= DELAY){
    timer = millis();
    Serial.print(analogValue);
    Serial.print("          ");
    Serial.print(voltage);
    Serial.print("          ");
    Serial.println(resistance);
  }
}

float analogToVoltage(int value){
  return value * MAX_VOLTAGE / MAX_ANALOG_VALUE;
}

float voltageToResistance(float V){
  return POT_RESISTANCE * abs(V-MAX_VOLTAGE) / MAX_VOLTAGE;
}