VB program, looping for iterations and excel writing - vb.net

Question

I'm writing a program for an internship and need some advice. I've done my research but have mostly returned fruitless... I need to loop the "buttonOneClick for one second iterations. The program will send a "P" character, wait one second, send a p, wait one second, etc... Also I need to write the information it receives to an excel spreadsheet. Any help/critiquing of existing code would be greatly appreciated.
Here's what I have:
Public Class Form2
Dim buttonOnePush As Boolean = False
Dim buttonTwoPush As Boolean = False
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
' Send strings to a serial port.
Using com5 As IO.Ports.SerialPort =
My.Computer.Ports.OpenSerialPort("COM5")
com5.WriteLine("P")
End Using
End Sub
Function ReceiveSerialData() As String
' Receive strings from a serial port.
Dim returnStr As String = ""
Dim com5 As IO.Ports.SerialPort = Nothing
Try
com5 = My.Computer.Ports.OpenSerialPort("COM5")
com5.ReadTimeout = 10000
Do
Dim Incoming As String = com5.ReadLine()
If Incoming Is Nothing Then
Exit Do
Else
returnStr &= Incoming & vbCrLf
End If
Loop
Catch ex As TimeoutException
returnStr = "Error: Serial Port read timed out."
Finally
If com5 IsNot Nothing Then com5.Close()
End Try
Return returnStr
End Function
Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
If IsNumeric(TextBox1.Text) AndAlso IsNumeric(TextBox2.Text) Then
TextBox1.Text = CDec(TextBox2.Text)
End If
End Sub
Private Sub TextBox6_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox6.TextChanged
If IsNumeric(TextBox6.Text) AndAlso IsNumeric(TextBox3.Text) Then
TextBox6.Text = CDec(TextBox3.Text)
End If
End Sub
Private Sub TextBox7_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox7.TextChanged
If IsNumeric(TextBox7.Text) AndAlso IsNumeric(TextBox4.Text) Then
TextBox7.Text = CDec(TextBox4.Text)
End If
End Sub
Private Sub TextBox8_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox8.TextChanged
If IsNumeric(TextBox8.Text) AndAlso IsNumeric(TextBox5.Text) Then
TextBox8.Text = CDec(TextBox5.Text)
End If
End Sub
Private Sub TextBox15_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox15.TextChanged
If IsNumeric(TextBox15.Text) AndAlso IsNumeric(TextBox16.Text) Then
TextBox15.Text = Hex(TextBox16.Text)
End If
End Sub
Private Sub TextBox14_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox14.TextChanged
If IsNumeric(TextBox14.Text) AndAlso IsNumeric(TextBox11.Text) Then
TextBox14.Text = Hex(TextBox11.Text)
End If
End Sub
Private Sub TextBox13_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox13.TextChanged
If IsNumeric(TextBox13.Text) AndAlso IsNumeric(TextBox10.Text) Then
TextBox13.Text = Hex(TextBox10.Text)
End If
End Sub
Private Sub TextBox12_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox12.TextChanged
If IsNumeric(TextBox12.Text) AndAlso IsNumeric(TextBox9.Text) Then
TextBox12.Text = Hex(TextBox9.Text)
End If
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
buttonTwoPush = True
buttonOnePush = False
Me.Close()
Form1.Close()
End Sub
End Class

Answer 1

Use a Timer to issue that command at one second intervals. Drag a Timer over to your form from the toolbox, and double click on it to get a _Tick method.
Set the .Interval member of the timer in your form's constructor, and use the .Start and .Stop methods to control it.
For the Excel piece, you'll need to add a reference to the project for the Microsoft Excel 12.0 (or 14.0 if you have Excel 2010) Object Library. Find this under the COM tab of the Add Reference dialog which you get by right clicking on the project in the Solution Explorer. See this page for an exhaustive reference (scroll down to the bottom of the page for a quick example in VB.NET).