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1. bradmartin333 commented on Nov 30, 2022

   

   bradmartin333

   on Nov 30, 2022

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   Hey @placic - I had the same issue with the Arduino Nano Every. My solution was to add this before calling connection.Open();

   SerialPort p = new(connection.PortName, connection.BaudRate) { DtrEnable = true };
   p.Open();
   Thread.Sleep(250);
   p.Close();

   The delay is important as you need enough time for the arduino to receive the DTR signal and write back.

   Full GetConnection() method:

   private static ISerialConnection? GetConnection(string name)
   {
       ISerialConnection connection = new SerialConnection(name, SerialBaudRate.Bps_57600);
       if (connection == null) Console.WriteLine("No Arduino found");
       else
       {
           try
           {
               // Unfortunate, but have to ping the port to enable coms
               // This is equal to toggling on the Serial Port Monitor in the Arduino IDE
               SerialPort p = new(connection.PortName, connection.BaudRate) { DtrEnable = true };
               p.Open();
               Thread.Sleep(250);
               p.Close();
   
               connection.Open();
               Console.WriteLine($"Connected Arduino at port {connection.PortName}");
           }
           catch (Exception)
           {
               Console.WriteLine($"Cannot connect to arduino on {connection.PortName}. Close open connections and try again.");
               return null;
           }
       }
       return connection;
   }