int pot = A0;
int led [] = {2,3,4,5,6,7,8,9};
float Mode;

void setup() {
  // put your setup code here, to run once:
pinMode(pot, INPUT);
for (int i=0; i<=9; i++){
  pinMode(led[i], OUTPUT);
}
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
Mode = map(analogRead(pot),0,1023,1,10);
Serial.println(Mode);
for (int i=0; i<=9; i++){
if(Mode > led[i]){
  digitalWrite(led[i],1);
}
else {
digitalWrite(led[i],0);
}
}
}