Reconnecting to a disconnected Arduino

dequo

Reconnecting to a disconnected Arduino

in Integration and Hardware • 2 years ago

I have a processing program reading data from the arduino, what i want is the ability to disconnect and reconnect the usb port and have the processing sketch begin reading again. is this possible?

Replies(4)

Jesse Sco..

Re: Reconnecting to a disconnected Arduino

2 years ago

I guess you could try to pack your Serial or Arduino declaration into a function, call that function in setup, then be able to call it again by some method or interaction ? Eg.

void setup() {
setArduino();
}
void setArduino() {
String portName = Serial.list()[0];
myPort = new Serial(this, portName, 9600);
}
void mouseClicked() {
setArduino();
}

??? Don't have one with me right now, so I can't test...

dequo

Re: Reconnecting to a disconnected Arduino

2 years ago

i tried making it so that if no serial event was detected in the last second then it would run this code

String portName = Serial.list()[1];

arduino = new Serial(this, portName, 57600);

this causes a portInUseException when the arduino is disconnected

edit:

the exception is because serial.list[1]; is no longer the arduino.

i did a test and once the arduino is reconnected, it never shows up in the serial port list. how do i get it back there? or is there a way to just restart the entire sketch without closing and opening it again?

hondaman9..

Re: Reconnecting to a disconnected Arduino

1 year ago

Hi dequo, did you ever get an answer to this? I too need to be able to "reset" the connection to my Arduino.

Thx

dequo

Re: Reconnecting to a disconnected Arduino

1 year ago

you have to stop the connection then start it again

stop:

yourArduino.stop();

then reconnect:

try{String portName = Serial.list()[yourArduinoPort];

yourArduino = new Serial(this, portName, 115200);

}catch(ArrayIndexOutOfBoundsException e)output.println("no COM port["+yourArduinoPort+"] found");}

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