int led = 8;
int sig = A0;


void setup() {
  // put your setup code here, to run once:
  pinMode(led, OUTPUT);
  pinMode(sig, INPUT);
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  int value = analogRead(sig);
  digitalWrite(led, value/4);
  Serial.println(value/4);
}