I/O Control Using Using Visual Basic

Output

STEP 1 - Download Fred Bulback's Dynamic Link Library (DLL) called io.dll from: http://www.geekhideout.com and copy it into the C:\WINDOWS\SYSTEM directory.

STEP 2 - Load Visual Basic, create a New project and add a Module ...

STEP 3 - In the Module Code window type in:

Public Declare Sub PortOut Lib "io.dll" (ByVal Port As Integer, ByVal Value As Byte)
Public Declare Function PortIn Lib "io.dll" (ByVal Port As Integer) As Byte

STEP 4 - Create a Form with two Command buttons:

STEP 5 - Add the following code:

STEP 6 - Attach a LED Interface. Run your programme and watch the LEDs change, OR run Fred Bulback's Paralell Port Monitor (parmon.exe) and watch the lines change state.

For further information about this Interface see: http://www.southwest.com.au/~jfuller/sio5.html

Input

STEP 1 - Set up a new Visual basic Form and add a Module as described above.

STEP 2 - Add a Command Button and a Label to your Form.

STEP 3 - Type in the following code...

STEP 4 - Connect an input interface, Run your programme and press the switches connected to the input lines.