const int led1Pin = 5;  
const int led2Pin = 4;  
const int potPin = 33;    

void setup() {
  pinMode(led1Pin, OUTPUT);  
  pinMode(led2Pin, OUTPUT);
  pinMode(potPin, INPUT);    
}

void loop() {
  int sensorValue = analogRead(potPin);  
  int brightness1 = map(sensorValue, 0, 4096, 0, 255);  
  int brightness2 = 255 - brightness1;  
  analogWrite(led1Pin, brightness1);  
  analogWrite(led2Pin, brightness2);  
}