---

#define PR A0
#define LED1 5
#define LED2 6

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

void loop()
{
  int prValue = analogRead(PR);

  int newValue = map(prValue, 0, 1023, 0, 20000);

  Serial.print("Resistance = ");
  Serial.println(newValue);

  int yarkost = map(newValue, 0, 20000, 255, 0);

  if (newValue >= 3000)
    analogWrite(LED1, yarkost);
  else
    analogWrite(LED1, 0);

  analogWrite(LED2, 255 - yarkost);
}