Arduino serialporta with C#

Question

I get the information passed through the serial port of my Arduino with this code:

cnx.Open();
    string carro = cnx.ReadLine();
    textBox1.Text = carro;
    cnx.Close();

I was wondering if it would be possible for me to print out two numbers on Arduin and send two values to the serial port with different information? and how I would get these two information with readline in my program c#?

Answer 1

You could read the serial port information with the ReadLine(), but you would need to create a Listener so that every time they had data available at the port, they were read.

The suggestion is that you use the event DataReceived, which will be called when data is to be read*.

For testing, you can upload the program SerialEvent arduino:

And with the following example code, you can send and receive data through the serial port:

using System;
using System.IO.Ports;

namespace ArduinoSerial
{
    class ArduinoSerial
    {
        private static SerialPort portaSerial = new SerialPort("COM3",
            9600, Parity.None, 8, StopBits.One);

        static void Main(string[] args)
        {
            // quando há dados na porta, chamamos dadosRecebidos
            portaSerial.DataReceived += new SerialDataReceivedEventHandler(dadosRecebidos);

            // criar a conexão
            portaSerial.Open();

            // mantendo o programa rodando
            while (portaSerial.IsOpen)
            {
                // o que escrevermos no console, vai pra porta serial
                portaSerial.WriteLine(Console.ReadLine());
            }
        }

        // dadosRecebidos imprime a informação de volta no console
        static void dadosRecebidos(object sender, SerialDataReceivedEventArgs e)
        {
            SerialPort sp = (SerialPort)sender;
            string dados = sp.ReadLine();
            Console.WriteLine(dados);
        }
    }
}

Upshot:

In the program SerialEvent Arduino, you will see that to send data for serial port, is used Serial.println(inputString);. Modifying the program, and replacing inputString for whatever you want, you can send different data to your program in C#.

*In the documentation the indicated is actually to use BytesToRead to see if data is being read.

Sources:
How to Read and Write from the Serial Port
Server Client send/receive simple text
C# Serial Port Listener

Answer 2

you can write in a Print only, and separate by a common character, for example a ';' then it would look like this:

the Arduin sends: "ABC-1234;GM;CELTA;WHITE"

in the c#:

string linha = cnx.ReadLine();
string[] valores = linha.Split(';');

string placa = valores[0]; //ABC-1234
string marca = valores[1]; //GM
string modelo = valores[2]; //CELTA
string cor = valores[3]; //BRANCO

from what I understand, this is what you need