How to send serial data to extra Arduino UNO serial port?

[beverlyfr]

Hi everybody. I'm using windows forms with visual studio and I added an extra serial port in my arduino uno with <SoftwareSerial.h>

I added a SerialPort in my windows forms app. But how can I send (from windows forms) and receive(from windows forms too) data from the extra serial port created in arduino IDE?

Thanks

[J-M-L]

Just like you would using a hardware serial port… (it will be more fragile, keep the baud rate low and/or the amount of data being exchanged)

[blh64]

The default serial port is recognized as a virtual COM port because that port goes through the ATMEGA16U or CH340 chip. You will need a RS232 to USB adapter, either a cable or a breakout board so that port appears in Windows.

[beverlyfr]

But I'm already using the arduino serial port. How can I decide towhich of the two send the data from windows forms?

[J-M-L]

You will need to add indeed an FTDI or equivalent usb to serial adapter and in you forms code

static SerialPort arduinoSowftwareSerialPort;
static public void Main()          
{             
    arduinoSowftwareSerialPort = new SerialPort("COM3", 9600, Parity.None, 8, StopBits.One);
    arduinoSowftwareSerialPort.Open(); 
…

If the adapter is on COM3

I have not touched a PC since ages so…