VozArduino

String voz;
int 
led1 =  9,
led2 = 10,
led3 = 11,  
led4 = 12,  
led5 = 13;  
  
void allon(){
     digitalWrite(led1, HIGH); 
     digitalWrite(led2, HIGH); 
     digitalWrite(led3, HIGH); 
     digitalWrite(led4, HIGH); 
     digitalWrite(led5, HIGH); 
}
void alloff(){
     digitalWrite(led1, LOW); 
     digitalWrite(led2, LOW); 
     digitalWrite(led3, LOW); 
     digitalWrite(led4, LOW); 
     digitalWrite(led5, LOW);
}
  
void setup() {
  Serial.begin(9600);
  pinMode(led1, OUTPUT); 
  pinMode(led2, OUTPUT); 
  pinMode(led3, OUTPUT); 
  pinMode(led4, OUTPUT); 
  pinMode(led5, OUTPUT); 
}
  
void loop() {
  while (Serial.available()){
  delay(10);
  char c = Serial.read();
  voz += c;
  }  
  if (voz.length() > 0) {
    Serial.println(voz); 
 
       if(voz == "ligar tudo"  ) {allon();}
  else if(voz == "desligar tudo"){alloff();}
  

  else if(voz == "ligar lâmpada 1") {digitalWrite(led1, HIGH);} 
  else if(voz == "ligar lâmpada 2") {digitalWrite(led2, HIGH);}
  else if(voz == "ligar lâmpada 3") {digitalWrite(led3, HIGH);}
  else if(voz == "ligar lâmpada 4") {digitalWrite(led4, HIGH);}
  else if(voz == "ligar lâmpada 5") {digitalWrite(led5, HIGH);}

  else if(voz == "desligar lâmpada 1") {digitalWrite(led1, LOW);} 
  else if(voz == "desligar lâmpada 2") {digitalWrite(led2, LOW);}
  else if(voz == "desligar lâmpada 3") {digitalWrite(led3, LOW);}
  else if(voz == "desligar lâmpada 4") {digitalWrite(led4, LOW);}
  else if(voz == "desligar lâmpada 5") {digitalWrite(led5, LOW);}
 
voz="";}}