char buffer[18];
int pinPWM=9;
int raw=0;
float Volt=0;

void Setup()
{
  Serial.begin(9600);
  Serial.println("DAC mit PWM-Ausgang");
  Serial.println();
  Serial.println("ggg");
  Serial.flush();
}
void loop()
{
  if (Serial.available()>0)
  {
    int index=0;
    delay(100);
    int numChar=Serial.available();
    if (numChar>15)
    {
      while (numChar--)
      {
        buffer[index++]=Serial.read();
      }
      splitString(buffer);
    }
  }
  void splitString(char*data)
  {
    Serial.print("ggg");
    Serial.println(data);
    char*parameter;
    parameter=strtok(data,",");
    while (parameter != NULL)
    {
      setPWM(parameter);
      parameter=strtok(NULL,",");
    }
    for (int x=0; x<16; x++)
    {
      buffer[x]='\0';
    }
    Serial.flush();
  }
  void setPWM(char*data)
  {
    int Ans=strtol(data, NULL, 10);
    Ans=constrain(Ans,0,255);
    analogWrite(pinPWM, Ans);
    Serial.print("PWM=");
    Serial.println(Ans);
    delay(100);
    raw=analogRead(0);
    float ref=5.0/1024.0;
    Volt=raw*ref;
    Serial.print("diebla blabla:");
    Serial.print(Volt);
    Serial.println("Volt");
    Serial.println();
    Serial.println("heheheh");
  }