Send numerical values from Matlab to arduino

I have an array (2x4) in Matlab which may contains integer values as well as values in decimals, may e positive or negative. For example: [1.1, 23, -1.56, 5.29; 2.14, 2.39, -67, 4.001]. I have to send these values to arduino using matlab. How to do so? I know how to send integer values to arduino from matlab but it is not working with decimal values.

Matlab Code to send integer values is below:

portName = 'COM5';
s = serial(portName,'BaudRate',9600,'Terminator','LF');
s.timeout = 1;
try 
    try
        fopen(s);
    catch
        delete(s);
        fopen(s);
    end
catch
    disp('Unable to open the port ');
end

angle = [1.3,2];
    dataOut = angle;
    dataOut_ = char(dataOut);
    fprintf(s,'%d',dataOut_);

Arduino code is given below:

int d1,d2;
char d[4];

      void setup() {
    // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(13, OUTPUT);
  }

void loop() {
  // put your main code here, to run repeatedly:
if(Serial.available()>0)
{
  for(int i=0; i<3;i++)
  {
    d[i]= Serial.read();
  }
  d1 = d[0]-'0';
  if (d1 == 1.3)
  {
    digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(2000);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);              // wait for a second
  }
}
}

[RaulOrtiz Fernandez]

Hello, for me, the easiest way to send numerical values from matlab to arduino is the following:

Code in Matlab:

delete(instrfind({'Port'},{'COM4'}));
PS=serial('COM4');
set(PS,'Baudrate',9600); % se configura la velocidad a 9600 Baudios
set(PS,'StopBits',1); % se configura bit de parada a uno
set(PS,'DataBits',8); % se configura que el dato es de 8 bits, debe estar entre 5 y 8
set(PS,'Parity','none'); % se configura sin paridad
set(PS,'Terminator','CR/LF');% “c” caracter con que finaliza el envío 
set(PS,'OutputBufferSize',8); % ”n” es el número de bytes a enviar
set(PS,'InputBufferSize' ,8); % ”n” es el número de bytes a recibir
set(PS,'Timeout',5); % 5 segundos de tiempo de espera
     kp =input('Ingrese valor de kp: ','s');
     fprintf(PS, '%s', kp);
       fclose(PS);
       delete(PS);
       clear PS;

Code in arduino:

int led = 12;
String text;
int ki;
void setup() {
                //pinMode(led, OUTPUT);
                Serial.begin(9600);
                ki = 0;
}
void loop() { 
  if (Serial.available()){
                    text = Serial.readStringUntil('\n');
                                           ki = text.toInt(); 
                                            if(ki == 1000){                                                               
                                              analogWrite(led,255);          
                                                         }
                                            if(ki == 0){          
                                              analogWrite(led,0);          
                                              }

To test that all work properly, connect a led in the pin d12 and run the code in matlab an put 1000. If works , the led will be blinked.

Hi hope this help you and other people.

[Fatima Kishimoto]

It didnt work for me and gives the error:

"OBJ must be connected to the hardware with FOPEN"

Answer 1

[michael jesus]

give me a process in Simulink, I need to pack the data from the graph to the Arduino as I do that communication through the serial port