Led_Serial_0_255

led_serial_0_255.pde

char letra[4]={'a','b','c','d'};
int brilho [4]={0,80,160,255};
int stateLed=10;
int infoLed=9;
int info;
int flag = 0;

int resMaster = 0;

String number;

void setup (){
  Serial.begin (9600);
  pinMode (stateLed, OUTPUT);
  pinMode (infoLed, OUTPUT);
  Serial.println("Digite a, b, c ou d.");
  
  number = String("");
  
}

void loop (){
  
  while ( Serial.available() > 0 ) {
    info = Serial.read();
    
    int res = -1;
    
    for ( int i = 0; i < 4; i++ ) {
      if ( info == letra[i] ) {
        res = i;
      }
    }
    
    if ( info != 13 ) {
      number += char(info);
    }
       
    if ( (flag == 2) || (info == 13 && flag < 2) ) {
     
      int sum = 0;
      
      for( int i = 0; i < 3; i++ ){
        sum = sum*10 + number[i]-'0';
      }

      Serial.println(sum);
      
      analogWrite(infoLed, sum);
     
      number = "";
      flag = 0;
      break;
    }
    
    flag++;
    
  }

}