Use UP and DOWN Keys

How to use UO and DOWN keys on keyboard to increase or decrease worksheet cell values using the Application.Onkey method.
rApplication.OnKey method (Excel) Runs a specified procedure or macro when a particular key or key combination is pressed.
Application.OnKey (Key, Procedure): The method requires two parameters – the key to be pressed and the macro or procedure to be run. Key is a required String and it indicates which key is to be pressed. The ‘procedure’ parameter is a string that represents the name of the procedure to be run. If the string is left blank then no action takes place. Watch the video below:

Here’s the complete VBA code to use short-cut keys to run a macro or procedure:

Sub incrementValue()
Range(“B2”).Value = Range(“B2”).Value + 1
End Sub

Sub decrementValue()
Range(“B2”).Value = Range(“B2”).Value – 1
End Sub

Private Sub Workbook_Open()
Application.OnKey “{Up}”, “incrementValue”
Application.OnKey “{Down}”, “decrementValue”
End Sub

Further Reading:
Application.OnKey method (Excel)
Disable key or key combination or run a macro if you use it
2 Ways to Assign Keyboard Shortcuts to Macros