Matlab - Arduino Communication. Matlab sends only 7bit data to arduino. How can i increase that?

Hi all, I want to send data from matlab to arduino. But, matlab sends only 7 bit data(between 0-127). How can increase that? I want to send 14 bit data(between 0-16384).

here is my arduino code

const int ledpin=13;
int recValue;

void setup()
{
Serial.begin(9600);
pinMode(13, OUTPUT);
}

void loop()
{
  if(Serial.available()>0)
    {
recValue =Serial.read();
    if  (recValue == 12007)            // If use will send value 100 from MATLAB                                           then LED will turn ON
     { 
       digitalWrite(ledpin, HIGH);
       }
        if(recValue == 10007)          // If use will send value 101 from MATLAB                                            then LED will turn OFF
         { 
         digitalWrite(ledpin, LOW);
         }
      }
    }

Answer 1

[Walter Roberson]

On the MATLAB side, you will need to send multiple bytes, such as using fwrite(s,TheValue,'uint16') . On the Arduino side you will need to do two Serial.read() and construct recValue from that, such as by using

firstbyte<<8 | secondbyte

Be careful about the byte order: MATLAB is probably going to send the least significant byte first.

[Cati Kati]

thank you for answering i will research them. i have one more question:

I guess when reading serial port, arduino gets numbers between 48-57. How can I convert them to real numbers? I researched a lot, but I could not code which works. Thank you for interest. Sorry my bad english.

[Walter Roberson]

The arduino gets 48-57 only if you used fprintf() with a numeric format such as %d or %f. If you use fwrite() then the byte values themselves would be sent.

If you do have the 48-57 range then subtract 48 to get the corresponding digit 0 to 9. You would probably need to put several of these digits together to build the decimal number. Binary (fwrite) is easier.

[Cati Kati]

OMG, it works! thank you ever so much, I was dealing with it since 3 days. Thank you so muchh =)