How to prevent double entry of bar codes in Excel

How to prevent double entry of bar codes in Excel. Information for double scanned barcode is not recorded in Excel. Determine the amount of time between the same barcode scan. Ignore the second scan of a bar code if it happens too quickly.
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Code
Sub access()
Dim barcode As String
Dim rng As Range
Dim foundVal As Range
Dim diff As Double
Dim rownumber As Long
barcode = ActiveSheet.Cells(2, 1)
If barcode (symbol for not equal) "" Then
Set rng = ActiveSheet.Range("a5:a150").Find(What:=barcode, _
LookIn:=xlFormulas, LookAt:=xlWhole, SearchOrder:=xlByRows, _
SearchDirection:=xlNext, MatchCase:=False, SearchFormat:=False)
If rng Is Nothing Then
ActiveSheet.Range("a5:a1005").Find("").Select
ActiveCell.Value = barcode
ActiveCell.Offset(0, 1).Select
ActiveCell.Value = Date & " " & Time
ActiveCell.NumberFormat = "m/d/yyyy h:mm:ss AM/PM"
ActiveSheet.Cells(2, 1) = ""
Else
rownumber = rng.Row
ActiveSheet.Range(Cells(rownumber, 1), Cells(rownumber, 10)).Find("").Select
ActiveSheet.Range("B3") = Date & " " & Time
diff = DateDiff("s", (ActiveCell.Offset(0, -1)), Date & " " & Time)
ActiveSheet.Range("B3") = ""
If diff (symbol for less than)15 Then
GoTo ende
End If
ActiveCell.Value = Date & " " & Time
ActiveCell.NumberFormat = "m/d/yyyy h:mm:ss AM/PM"
ende:
ActiveSheet.Cells(2, 1) = ""
End If
End If
ActiveSheet.Cells(2, 1).Select
End Sub
Private Sub Worksheet_Change(ByVal Target As Range)
If Not Intersect(Target, Me.Range("A2")) Is Nothing Then
Call access
Application.EnableEvents = True
End If
End Sub

[@BarbHendersonconsulting]

Thank you so much for watching my video. Please note that in the code that I have put in the description of the video, I am not able to put or > or less >, So replace the (symbol for not equal with ) and the symbol for less than with < .

lovely stuff

[@Laxmanmane007]

Please upload video on power bi

[@michaelangeloacorda8861]

Thabk you so much ma'am but I have a question how can we protect from tampering once there's a data entry. Like it will automatically locked when there is a new data entry. Thank you in advance! I'm a subscriber from Philippines

[@BarbHendersonconsulting]

answered on other videi

[@michaelangeloacorda8861]

Thank you so much!! How about making data entry protected after data entry? Please help me! I just want to avoid time tampering, after scanning barcodes then it record the date and time in and out what code we can use to protect the data after? Thank you again in advance! A subscriber from Philiipines!

[@BarbHendersonconsulting]

protecting the sheet would not allow the barcodes to be scanned. Protecting the cell would be have to be done on each cell, very time consuming. sorry

[@SKGOELDELHI]

to control gathering at food counter , how can we use the barcode with scanner to prevent duplicates ..can you help

[@BarbHendersonconsulting]

you would have to write code to not allow the code to be scanned twice.

[@SKGOELDELHI]

@@BarbHendersonconsulting how do i do that please , kindly guide

[@SKGOELDELHI]

any tutorial on that ever made by you? that's so useful nowadays