vb串口数据采集及曲线动态显示

1、 串口数据采集及曲线动态显示这个程序主要用到了串口通信和曲线画图一 主要控件Msomm控件一个，两个timer控件，textbox控件，combo控件，picture控件，command控件二实现的功能能 1.串口采集数据 2.用曲线动态显示数据 3. 显示时间 4.鼠标点击读数（确定所点击位置的横纵坐标）三界面四程序Dim T As VariantDim c As VariantDim Y As IntegerPrivate Declare Sub Sleep Lib "kernel32 " (ByVal dwMilliseconds As Long) 'API,

2、用sleep实现延时'延时函数Function delay(number) Call Sleep(number) DoEventsEnd FunctionPrivate Sub Combo1_Click() '选择端口 If Combo1.Text = "COM1" Then MSComm1.CommPort = 1 ElseIf Combo1.Text = "COM2" Then MSComm1.CommPort = 2 ElseIf Combo1.Text = "COM3" Then MSComm1.CommPor

3、t = 3 ElseIf Combo1.Text = "COM4" Then MSComm1.CommPort = 4 Else MSComm1.CommPort = 5 End IfEnd SubPrivate Sub Command3_Click() '停止采集 Timer2.Enabled = False MSComm1.PortOpen = False Command2.Caption = "打开串口"End SubPrivate Sub Form_Load() '初始化 MSComm1.Settings = "9600

4、,N,8,1" MSComm1.InputMode = 0 MSComm1.RThreshold = 1 MSComm1.SThreshold = 0 MSComm1.InBufferSize = 1024 MSComm1.OutBufferSize = 512 MSComm1.InBufferCount = 0 MSComm1.OutBufferCount = 0 Combo1.AddItem "COM1" Combo1.AddItem "COM2" Combo1.AddItem "COM3" Combo1.AddItem

5、 "COM4" Combo1.AddItem "COM5" Picture1.Scale (-100, 100)-(100, -100) Command1.Caption = "采集数据" Command2.Caption = "打开串口" Timer1.Interval = 1000 Timer2.Interval = 1000 Timer2.Enabled = FalseEnd SubPrivate Sub Command2_Click() If Command2.Caption = "打开串口&qu

6、ot; Then MSComm1.PortOpen = True Command2.Caption = "关闭串口" ElseIf Command2.Caption = "关闭串口" Then MSComm1.PortOpen = False Command2.Caption = "打开串口" End IfEnd SubPrivate Sub MSComm1_OnComm() '触发事件 If MSComm1.InBufferCount > 0 Then Text4.Text = MSComm1.Input c = Va

7、l(Text4.Text) delay (20) End IfEnd SubPrivate Sub draw() Picture1.FontSize = "15" '设置字体大小 Picture1.DrawWidth = 1 Picture1.ForeColor = QBColor(12) Picture1.Cls Picture1.Line (-88, -88)-(-88, 88) '纵坐标 Picture1.Line (-89, 86)-(-88, 88) '纵坐标箭头及y值 Picture1.Line (-87, 86)-(-88, 88) P

8、icture1.PSet (-86, 88) Picture1.Print "y" Picture1.Line (-88, 0)-(88, 0) '横坐标 Picture1.Line (86, 1)-(88, 0) '横坐标箭头及x值 Picture1.Line (86, -2)-(88, 0) Picture1.PSet (88, -1) Picture1.Print "x" Picture1.DrawWidth = 4 Picture1.FontSize = 8 For Y = -80 To 80 Step 10 Picture1.P

9、Set (-88, Y) Picture1.Print (Y) Next Y T = -88 Timer2.Enabled = TrueEnd SubPrivate Sub Picture1_MouseDOWN(Button As Integer, Shift As Integer, B As Single, A As Single) '"光标线读数" Text1.Text = B Text2.Text = AEnd SubPrivate Sub Command1_Click() '开始采集 Call drawEnd SubPrivate Sub Timer2_Timer() '画图 Picture1.DrawWidth = 1 Picture1