This is the most effcient way I have been able to establish a MATLAB / serial communication and it allows you to focus on putting more weight on the Arduino or MATLAB code depending what you feel more comfertable with.
MATLAB
% Connect to serial port and set properties
s = serial('/dev/cu.usbmodem14101', 'BaudRate', 9600);
s.InputBufferSize = 20;
s.Timeout = 4;
fopen(s);
% Pause to begin a flow of data
pause(3);
fprintf("Connection established\n")
% Start a counter and timer
count = 0;
tic
startTimer = toc;
% Get data for 15 seconds
while (toc < startTimer+15)
% Perform the header checks and get cast bytes to ints
if (fread(s, 1) == 159)
if (fread(s, 1) == 110)
x = fread(s, 2);
analogOut = typecast(uint8(x), 'uint16');
end
end
% Display data to the user
fprintf("%d\n", analogOut)
end
% Remove serial port connection
fclose(s);
delete(s)
clear s
Arduino
int analogValue;
void setup() {
// Setup serial port
Serial.begin(9600);
}
void loop() {
// Read the analog pin
analogValue = analogRead(A0);
// Write bytes via serial
writeBytes(&analogValue);
}
void writeBytes(int* data1){
// Cast to a byte pointer
byte* byteData1 = (byte*)(data1);
// Byte array with header for transmission
byte buf[4] = {0x9F, 0x6E, byteData1[0], byteData1[1]};
// Write the byte
Serial.write(buf, 4);
}
