int led = 8;
int light = 0;

void setup() {
  pinMode(led, OUTPUT);
  Serial.begin(9600);
  Serial.println("Enter brightness (0-255):");
}

void loop() {
  if (Serial.available() > 0) {
    String inputString = Serial.readStringUntil('\n');
    light = inputString.toInt();
    Serial.println(light);
    analogWrite(led,light);
    
  }else if(light<0 || light>255){
    light=0;
    analogWrite(led,light);
    Serial.println("Invalid input.Enter a value from 0 to 255");
  }
  
}