Interface from Arduino to VB.net, need help as a beginner

Projects Interfacing w/ Software on the Computer
14

I don't know a great deal about MSChart but I believe it's a subject you are going to have to research on more appropriate forums, there is a great deal of info out there. To get you started I can help with something simple that allows you to alter values and play around with a template that assumes the values come from the Arduino once every second for a duration of five minutes.

Snippet 1 is code that resets the Arduino and clears the PC serial buffer giving you a clean start.

SerialPort1.DtrEnable = True
        SerialPort1.Open()
        SerialPort1.ReadExisting()

Snippet 2 is an addition to your existing DisplayData sub routine and passes the data to the chart.

Dim chartvalue As Integer

If txtarray(0) = "Sensor1" Then
                TextBox1.Text = "Sensor 1 value=" & txtarray(1) & " %"
                Integer.TryParse(txtarray(1), chartvalue)
                Chart1.Series("Series1").Points.Add(chartvalue)
            End If

            If txtarray(0) = "Sensor2" Then
                TextBox2.Text = "Sensor 2 value=" & txtarray(1) & " %"
                Integer.TryParse(txtarray(1), chartvalue)
                Chart1.Series("Series2").Points.Add(chartvalue)
            End If

Snippet 3 is a sub routine with various chart settings that you can play around with to learn and modify the charts properties. Call this sub from the Form1 Load event handler.

Private Sub ChartSettings()

        Chart1.BackColor = Color.Bisque

        Chart1.Series("Series1").ChartType = SeriesChartType.Spline
        Chart1.Series("Series2").ChartType = SeriesChartType.Spline

        Chart1.Series("Series1").BorderWidth = 2
        Chart1.Series("Series2").BorderWidth = 2

        Chart1.Series("Series1").Color = Color.Red
        Chart1.Series("Series2").Color = Color.DarkBlue

        With Chart1.ChartAreas(0).AxisX

            .Maximum = 300
            .Minimum = 0

            .LabelStyle.Format = "0S"
            .Title = "Humidity"
            .TitleFont = New Font(New FontFamily("Arial"), 9, FontStyle.Bold)

            .MajorGrid.Interval = 1
            .MajorGrid.Enabled = True

            .MajorTickMark.Enabled = True
            .MajorTickMark.Interval = 1
            .MajorTickMark.Size = 2

            .LabelStyle.Enabled = True
            .LabelStyle.Interval = 10

        End With

        With Chart1.ChartAreas(0).AxisY

            .Maximum = 100
            .Minimum = 0

            .MajorGrid.Interval = 10
            .MajorGrid.Enabled = True

            .MajorTickMark.Enabled = True
            .MajorTickMark.Interval = 10
            .MajorTickMark.Size = 2

            .LabelStyle.Enabled = True
            .LabelStyle.Interval = 10

        End With

        Chart1.ChartAreas(0).AxisX.ScrollBar.IsPositionedInside = False
        Chart1.ChartAreas(0).AxisX.ScaleView.Zoom(1, 59)

    End Sub

Snippet 4 is the Imports instruction required to use the chart properties.

Imports System.Windows.Forms.DataVisualization.Charting