Question

我正在尝试读取Arduino正在发送的串行数据，但即使我更改了Arduino输出，它也会不断地给我一遍又一遍收到的字符串。为什么它只给我第一个值而不是更新？

Module Module1
Sub Main()
    Dim com4 As IO.Ports.SerialPort = Nothing
    com4 = My.Computer.Ports.OpenSerialPort("COM4")
    Dim incoming As String
    Do
        incoming = com4.ReadLine()
        Console.WriteLine(incoming)
        Threading.Thread.Sleep(250)
    Loop
End Sub
End Module

Answer 1

可能是，根据你的arduino草图，它会将相同的数据发送一段时间，填满接收缓冲区，这是在Do循环中读取一段时间的内容。

尝试使用活动

dim withevents com4 as serialport.......

sub datareceivedhandler (sender as object, e as eventargs) handles com4.datareceived
dim incoming as string = com4.readline
console.writeline(incoming)

end sub

串行读取值不会改变

1 个答案: