int LedRed = 3;
int LedBlue = 6;
int pot;
int value;

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(LedRed, OUTPUT);
pinMode(LedBlue, OUTPUT);
pinMode(A0, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:

pot = analogRead(A0);
//Serial.println(pot);

if (pot >= 100 && pot <= 500 )
{
  value = map(pot,100,500,0,255);
  Serial.println(value);
  analogWrite(LedBlue, value);
  delay(10);
}

if (pot >= 600 && pot <= 1000 )
{
  value = map(pot,600,1000,255,0);
  Serial.println(value);
  analogWrite(LedRed, value);
  delay(10);
}

  digitalWrite(LedBlue, LOW);
  digitalWrite(LedRed, LOW);
}