int data = 0; 

void setup() {
  Serial.begin(9600);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
}

void loop() {
  data = analogRead(A0);
  
  Serial.println(data);
  
  if(data > 100)
  {
  digitalWrite(9, HIGH);
  }
  else
  {
  analogWrite(9,LOW);
  }
  if(data > 200)
  {
  digitalWrite(8, HIGH);
  }
  else
  {
  analogWrite(8,LOW);
  }
  if(data > 300)
  {
  digitalWrite(7, HIGH);
  }
  else
  {
  analogWrite(7,LOW);
  }
  if(data > 400)
  {
  digitalWrite(6, HIGH);
  }
  else
  {
  analogWrite(6,LOW);
  }
  if(data > 600)
  {
  digitalWrite(5, HIGH);
  }
  else
  {
  analogWrite(5,LOW);
  }
  if(data > 700)
  {
  digitalWrite(4, HIGH);
  }
  else
  {
  analogWrite(4,LOW);
  }
  if(data > 800)
  {
  digitalWrite(3, HIGH);
  }
  else
  {
  analogWrite(3,LOW);
  }
  if(data > 900)
  {
  digitalWrite(2, HIGH);
  }
  else
  {
  analogWrite(2,LOW);
  }
  
  delay(100);
}