---

#define RESISTOR A0
#define LED1 9
#define LED2 10

void setup() {
  pinMode(RESISTOR, INPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int value = analogRead(RESISTOR);
  int resistance = map(value, 0, 1023, 0, 10000);

  Serial.print("R = ");
  Serial.print(resistance);
  Serial.println(" Ohm");

  if (resistance >= 3000)
    digitalWrite(LED1, HIGH);
  else
    digitalWrite(LED1, LOW);

  analogWrite(LED2, map(resistance, 0, 10000, 255, 0));

  delay(100);
}