Sending a variable from MATLAB to Arduino
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Lorenzo Lellini
am 15 Dez. 2022
Kommentiert: Lorenzo Lellini
am 15 Dez. 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!
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Bora Eryilmaz
am 15 Dez. 2022
Bearbeitet: Bora Eryilmaz
am 15 Dez. 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 Kommentare
Bora Eryilmaz
am 15 Dez. 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.
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