Serial Communication with Arduino

Question

Lisa-Sophie Baier 2019-3-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/449412-serial-communication-with-arduino

评论： Mark Sherstan 2019-3-27

Hello,

I want that a serial communication with an Arduino.

They can communicate. I did it over the serial Connection without addons.

As next step I want to send with MatLab a "start send" message to the Arduino. At the moment the Arduino receive the message the controller should start the programm to send the data to matLab.

Sadly it doesnt work.

I hope that you can help me!

Thanks Lisa

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Mark Sherstan 2019-3-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/449412-serial-communication-with-arduino#answer_366775

在 MATLAB Online 中打开

Your code should look something like this. Not the fprintf on the MATLAB side and the if (Serial.avilable() > 0 ) on the Arduino side.

MATLAB

% s is the serial port object...
fprintf(s, 'a'); % Send character to ardiuno
out = fscanf(s, '%40s\n'); % Read data from ardiuno 
split = strsplit(out, ','); % Seperate data based off commas
% Continue to process...

ARDUINO

void setup(){
  Serial.begin(115200);
  Serial.setTimeout(3);
  
  ... set up
}
void loop(){
... data acquistion and processing 
    
  if (Serial.available() > 0) {
            
  incomingString = Serial.readString();
    if (incomingString == "a\n") {
      Serial.print(data1); Serial.print(","); Serial.println(data2);
    }
  }
}

4 个评论
显示 2更早的评论隐藏 2更早的评论

Lisa-Sophie Baier 2019-3-27

Later on this should be my goal, yes.

For now I just want to send an Array from the Arduino to MatLab to work there with the data.

Mark Sherstan 2019-3-27

在 MATLAB Online 中打开

I would reccomend having the Ardiuno just printing a single analog value and use MATLAB to create your array of data for processing. You will have to modify the code below depending on the size of your array but this is a fully working system that should push you in the right direction. You may also want to consider checking out this link.

ARDUINO

// Declare variables
int rawSensorVal;
String incomingString;
void setup(){
  // Initialize serial port
  Serial.begin(115200);
  Serial.setTimeout(3);
}
void loop(){
  // Read analog pin
  rawSensorVal = analogRead(A0);
  // Check if MATLAB has sent a character
  if (Serial.available() > 0) {
    incomingString = Serial.readString();
    // If character is correct send MATLAB the analog value
    if (incomingString == "a\n") {
      Serial.println(rawSensorVal);
    }
  }
}

MATALB

% Connect to serial port
s = serial('/dev/cu.usbmodem14101', 'BaudRate', 115200);
fopen(s);
pause(3);
fprintf("Connection established\n")
% Start a counter and timer
count = 0;
tic
startTimer = toc;
% Get data for 5 seconds
while (toc < startTimer+5)
  % Send character and receive data
  fprintf(s, "a");
  out = fscanf(s, '%d\n');
  % Display data to user
  fprintf("%d\n",out)
  % Increment counter
  count = count + 1;
end
% Display sample rate to user
endTimer = toc;
fprintf("Sample rate was: %0.2f Hz\n",count/(endTimer - startTimer))
% Remove serial port connection
fclose(s);
delete(s)
clear s