hi guys. i`m new to vb and here to seek advice regarding data received in serial com. i`m trying to make external hardware to control Interface in vb, which is arduino. the thing is, both serial works fine, however when i try to send "1" from arduino (even though when i monitor the serial output, it do came out "1") vb receive higher value which is 255. does the data receive thru serial to vb add up as it receive? i already tried to receive string input, end up the same and sometimes dont even works. what did i do wrong in serial receive? thanks in advanced

Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        pic1.Visible = False
        pic2.Visible = False
    End Sub

    Private Sub btnOpen_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOpen.Click
        SerialPort1.PortName = "com3"
        SerialPort1.BaudRate = 9600
        SerialPort1.Encoding = System.Text.Encoding.Default
        btnOpen.Enabled = False

    End Sub

    Sub DataReceived()
        Dim receiveData As Integer

        receiveData = SerialPort1.ReadChar

        txtReceive.Text = receiveData
        If receiveData = 1 Then
            pic1.Visible = True

        End If
        If receiveData = 2 Then
            pic2.Visible = True
        End If
    End Sub
    Delegate Sub ConnectedCallBack()
    Private Sub SerialPort1_DataReceived(ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
        Dim D As New ConnectedCallBack(AddressOf DataReceived)
        Catch ex As Exception
        End Try
    End Sub
End Class