从Arduino串口监视器

Question

我似乎无法从Arduino的最后一行（连接到coinslot）转移到标签（vb.net）。 arduino的输出结果显示我已经将多少硬币插入硬币中。然后，我必须将arduino输出中的最后一个数字传送到我创建的vb.net程序中的标签。结果是标签显示了arduino输出的所有行。我将在下面发布代码和照片。

Here is the output from arduino

和

Here is the label from my vb.net program (coins inserted)

以下是vb.net中的代码：

Private Sub printdoc_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
    Control.CheckForIllegalCrossThreadCalls = False
    Try
        For Each port As String In SerialPort.GetPortNames
            port = "COM8"
        Next
        SerialPort1.BaudRate = Val("9600")
    Catch ex As Exception
        MsgBox(ex.Message)
    End Try

    Try
        SerialPort1.Open()

    Catch ex As Exception

    End Try

End Sub
Private Sub SerialPort1_DataReceived(sender As System.Object, e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
    Label10.Text &= SerialPort1.ReadExisting()
End Sub

以下是arduino中的代码：

 #include <LiquidCrystal.h>

 volatile int coins = 0;

 void setup()
 {
   Serial.begin(9600);
   pinMode (2,INPUT_PULLUP);
   attachInterrupt(0, coinInserted, FALLING);
 }
 void coinInserted()
 {
   coins = coins + 1;
   Serial.println(coins); 
 }

似乎找不到任何解决方案。有什么建议吗？