int pent = A0;
int val = 0;
int led = 10;


void setup() {
  // put your setup code here, to run once:
pinMode(pent, INPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
val = analogRead(pent);
Serial.println(val);
analogWrite(led, val/4);
}