Sending a variable from MATLAB to Arduino
23 views (last 30 days)
Show older comments
Lorenzo Lellini
on 15 Dec 2022
Commented: Lorenzo Lellini
on 15 Dec 2022
I have a probelm in sending variables from MATLAB to Arduino using the serial connection. Here it is just a test that I prepared but it does not work.
When I run the MATLAB code I see that something happens on Arduino and it seems that the Arduino IDE load the code on the board again (I load it before running MATLAB), but the variable does not change and nothing happens.
Here is the MATLAB Code:
clear all; clc;
variable = 100;
arduino=serialport('/dev/tty.usbmodem1401',9600); % create serial communication object
fopen(arduino); % initiate arduino communication
fwrite(arduino, '%d', variable) % send answer variable content to arduino
clear arduino; % end communication with arduino
%fclose(arduino);
And here is the Arduino Code:
int variable = 0;
void setup() {
pinMode(13, OUTPUT);
Serial.begin(9600);
if (Serial.available() > 0){
variable = Serial.read();
}
if(variable != 0 ){
digitalWrite(13, HIGH);
delay(1000);
digitalWrite(13, LOW);
delay(1000);
}
}
void loop() {
}
Thank you!
0 Comments
Accepted Answer
Bora Eryilmaz
on 15 Dec 2022
Edited: Bora Eryilmaz
on 15 Dec 2022
You have to call Serial.read() in loop() and not in setup(), since setup() is called only once when Arduino starts running. Also, the second if-block should probably be nested inside the first if-block.
void loop() {
if (Serial.available() > 0){
variable = Serial.read();
if(variable != 0 ){
digitalWrite(13, HIGH);
delay(1000);
digitalWrite(13, LOW);
delay(1000);
}
}
}
5 Comments
Bora Eryilmaz
on 15 Dec 2022
If you want it to blink continuously once the variable is received, then you would need to take the second if-block out of ther first if-block as in your original code.
More Answers (0)
See Also
Categories
Find more on MATLAB Support Package for Arduino Hardware in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!