automatically execute an Excel macro on a cell change

Question

How can I automatically execute an Excel macro each time a value in a particular cell changes?

Right now, my working code is:

Private Sub Worksheet_C         


        

Answer 1

I prefer this way, not using a cell but a range

    Dim cell_to_test As Range, cells_changed As Range

    Set cells_changed = Target(1, 1)
    Set cell_to_test = Range( RANGE_OF_CELLS_TO_DETECT )

    If Not Intersect(cells_changed, cell_to_test) Is Nothing Then 
       Macro
    End If