Change COM port during program execution.

Core Library Questions

dirtgambit

Change COM port during program execution.

in Core Library Questions • 2 years ago

Hi, Just new to this forum as I was told my query might be best answered here, Id like to implement some sort of COM port changing within my program. My friends computer has his arduino on COM4, if I start my program on his comp no data will come through as my processing app is looking for COM3, id like to change the com port to suit my friends computer without having to recompile and change COM3 to COM4 within the processing IDE. All id like to do is take my app to his house, run the exe select the com port then the data will come through. How could I go about this in processing?

Regards

DirtGambit

Replies(1)

Manindra29

Re: Change COM port during program execution.

2 years ago

The COM port your Arduino is attached to can vary for different PCs. You can simply open the Arduino IDE on a system, go to Tools->Serial Port. The port to which Arduino is connected is shown checked.

Alternatively, within processing, use println(Serial.list());. This would print out the list of COM ports available on your system. Generally Arduino is connected to the last port on the list. By trial and error, you could find out the port index on the list your Arduino is connected to. Then use the following code to select the COM port:

println(Serial.list());
arduinoPort = new Serial(this, Serial.list()[4], 9600); //My Arduino is connected to COM25 which is 5th in the list, so I've used 4. Select whatever index your Arduino is on.