arduino serial read string

problem:

I want to use a Bluetooth app or other sensors to connect to the Arduino serial port, but what comes from the serial port is a bunch of unreadable numbers (Figure 1)?

(1) (Photo 1)

answer:

Because what the sender sent isUTF-8String, the serial port only prints one byte at a time, so this happens. All we have to do is add the value read for the first time and the value read next, and so on until There is no data to read, and then print it out so we can get the data we want! !

Routine:

Image version & effect:

Text version:

int x;//Cache function
 String comdata = "";//String function
void setup() {
     Serial.begin(9600);//Open serial port baud rate 9600
}

void loop() {
     if (Serial.available()> 0) // judge whether there is data in the serial port
  {
         String comdata = "";//The cache is cleared
         while (Serial.available()> 0) // whether there is data in the loop serial port
    {
             comdata += char(Serial.read());//Overlay data to comdata
             delay(2);//Delay to wait for response
    }
         if (comdata.length()> 0)//If comdata has data
    {
             Serial.println(comdata);//Print comdata data
    }
  }
}

Thanks for learning --- @ app ape

arduino learning exchange group: 127541648 ?? ?? ?? ?? ?? ??

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