Teste

#include <Ultrasonic.h>

#define echoPin 13
#define trigPin 12
const int buzzer = 10;
const int led = 8;
int     pinAtual = 0;
boolean bPin = false;
int     pwmPin = 0;
boolean bPwm = false;
int     statPin = 0; // 1 off 2 on
boolean bStat = false;

Ultrasonic ultrasonic(12,13);

void setup()
{
  Serial.begin(9600);
  pinMode(echoPin, INPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(led, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(11, OUTPUT);
}

void leStringSerial(){
  String conteudo = "";
  String statuss = "";
  char stat;
  char caractere;

  // Enquanto receber algo pela serial
  while(Serial.available() > 0) {
    // Lê byte da serial
    caractere = Serial.read();
    if (caractere != '\n') {
      if (caractere == ':') {
        caractere = Serial.read();
        statuss.concat(caractere);
      } else {
        conteudo.concat(caractere);
      }
    }
    delay(10);
  }
  if (conteudo == "ma") {
    analogWrite(6, 0);
  }
    if (conteudo == "mb") {
    analogWrite(6, 50);
  }
    if (conteudo == "mc") {
    analogWrite(6, 100);
  }
    if (conteudo == "md") {
    analogWrite(6, 150);
  }
    if (conteudo == "me") {
    analogWrite(6, 200);
  }
    if (conteudo == "mf") {
    analogWrite(6, 250);
  }
    if (conteudo == "mg") {
    analogWrite(6, 255);
  }
  pinAtual = conteudo.toInt();
  statPin = statuss.toInt();
}
void loop()
{
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  int distancia = (ultrasonic.Ranging(CM));
  Serial.print("Distancia em CM: ");
  Serial.println(distancia);
  if (distancia <= 10) {
    tone(buzzer,500);
    Serial.println('a');
    digitalWrite(led, HIGH);
  } else {
    noTone(buzzer);
    digitalWrite(led, LOW);
  }
    if (Serial.available() > 0){
    leStringSerial();
    if (statPin == 1) {
      digitalWrite(pinAtual, LOW);
    } else {
      digitalWrite(pinAtual, HIGH);
    }
  }
  delay(10);
}