Serial.readStringUntil() ê caracteres do buffer serial e os move para uma String. A função termina se o caractere terminador é encontrado, ou se ocorre time-out (ver setTimeout()).

A função Serial.readStringUntil() é herdada da classe Stream.




  • Serial: objeto porta serial. Veja a lista de portas seriais disponíveis em cada placa no Serial - Página principal
  • terminador : o caractere que encerra a busca (char)


A String() completa lida do buffer serial, até o caractere terminador.

Código de Exemplo

void setup() { Serial.begin(9600); // opens serial port, sets data rate to 9600 bps } void loop() { // check if data is available if (Serial.available() > 0) { // read the incoming string: String incomingString = Serial.readStringUntil('\n'); // prints the received data Serial.print("I received: "); Serial.println(incomingString); } }
  • Select Newline at the ending selection of Serial Monitor
  • Type "HELLO" on Serial Monitor
  • Click Send button:
  • COM6
    Autoscroll Show timestamp
    Clear output
    9600 baud  
  • The result on Serial Monitor:
  • COM6
    I received: HELLO
    Autoscroll Show timestamp
    Clear output
    9600 baud  

※ Notas e Advertências:

  • O caractere terminador é descartado do buffer serial.
  • Serial functions are not only used for the communication between an Arduino board and Serial Monitor of Arduino IDE but also used for the communication between:
    • An Arduino board and other Arduino board
    • An Arduino board and other sensors/devices
    • An Arduino board and computer (any Serial software on computer)

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