const int ledPin = 5;  
int analogPin = 34;   
int val = 0;         
void setup()
{
  pinMode(ledPin, OUTPUT);  
  Serial.begin(115200);        
}
void loop()
{
 val = analogRead(analogPin);   
 int x= map(val, 0,1023,0,255); 
 digitalWrite(ledPin, x);
 Serial.print("mapped value:");
 Serial.println(x);
  }