int LedVerde=3;
int LedAmarelo=5;
int LedLaranja=6;
int LedVermelho=9;
int ValorSensor=0;
void setup() {
  Serial.begin(9600);
  pinMode(LedVerde,OUTPUT);
  pinMode(LedAmarelo,OUTPUT);
  pinMode(LedLaranja,OUTPUT);
  pinMode(LedVermelho,OUTPUT);
}

void loop() {
  digitalWrite(LedVerde,LOW);
  digitalWrite(LedAmarelo,LOW);
  digitalWrite(LedLaranja,LOW);
  digitalWrite(LedVermelho,LOW);

  ValorSensor=analogRead(A0);
  Serial.println("ValorSensor:"+String(ValorSensor));
  if (ValorSensor<=250){digitalWrite(LedVerde,HIGH);}
  if (ValorSensor>251 && ValorSensor<=500){digitalWrite(LedAmarelo,HIGH);}
  if (ValorSensor>501 && ValorSensor<=750){digitalWrite(LedLaranja,HIGH);}
  if (ValorSensor>751){digitalWrite(LedVermelho,HIGH);}
  delay(2000);
}