Added yet another...

Tools/Add-ComputerToMDTDatabase/Add-ComputerToMDTDataBase.ps1

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+#Add Computer to the MDT Database 1.0
+Param(
+    [Parameter(Mandatory=$true,ValueFromPipeline=$true)] 
+    [ValidateLength(3,16)]
+    [ValidatePattern('[A-Z][0-9]')]
+    [String]$ComputerName,
+
+    [Parameter(Mandatory=$true,ValueFromPipeline=$true)] 
+    [ValidateSet('Standard_PC','RnD','Admin_Workstation')] 
+    [String]$Role,
+
+    [Parameter(Mandatory=$true,ValueFromPipeline=$true)] 
+    [ValidatePattern('^([0-9a-fA-F]{2}[:-]{0,1}){5}[0-9a-fA-F]{2}$')]
+    [String]$MacAddress,
+
+    [Switch]$Force
+)
+
+#Import the Modules and connect to the database
+#Note: You need to have the MDTDB PowerShell module installed as well as the Active Directory module to be able to access the data.
+#
+Import-Module MDTDB -ErrorAction Stop
+Import-Module ActiveDirectory -ErrorAction Stop
+Connect-MDTDatabase -sqlServer MDT01 -database MDT01 -instance SQLExpress -ErrorAction stop
+
+#Create function for check AD if name exists
+Function CheckIfComputerInADExists{
+    Param(
+        $ComputerName
+    )
+    try {
+        $Null = Get-ADComputer $ComputerName
+        Return $True
+    }
+    Catch {
+        Return $False
+    }
+}
+
+#Create function for check MDT DB if name exists
+Function CheckIfComputerInMDTExists{
+    Param(
+        $ComputerName
+    )
+    $result = Get-MDTComputer | Where-Object -Property OSDComputerName -EQ -Value $ComputerName
+    if($result -ne $null){Return $True}else{$False}
+}
+
+#Create function for check MDT DB if MAC exists
+Function CheckIfMacAddressInMDTExists{
+    Param(
+        $MacAddress
+    )
+    $result = Get-MDTComputer -macAddress $MacAddress
+    if($result -ne $null){Return $True}else{$False}
+}
+
+#Check if Computer exists in Active Directory
+$CheckAD = CheckIfComputerInADExists -ComputerName $ComputerName
+if($CheckAD -eq $true){
+    Write-Warning "$ComputerName exists in Active Directory"
+    if(!($Force)){BREAK}
+    }else{Write-Host "AD Name check OK"}
+
+#Check if Computer exists in the MDT database
+$CheckMDT = CheckIfComputerInMDTExists -ComputerName $ComputerName
+if($CheckMDT -eq $true){
+    Write-Warning "$ComputerName exists in the MDT database"
+    if(!($Force)){BREAK}
+    }else{Write-Host "MDT name check OK"}
+
+#Check if MacAddress exists in the MDT database
+$CheckMAC = CheckIfMacAddressInMDTExists -MacAddress $MacAddress
+if($CheckMAC -eq $true){
+    Write-Warning "$MacAddress exists in the MDT database"
+    if(!($Force)){BREAK}
+    }else{Write-Host "MDT macaddress check OK"}
+
+#Create array for all settings the computer should have
+$Settings = @{
+OSInstall='YES';
+OSDComputerName="$ComputerName"
+}
+
+#If computer name exists and we used the -Force switch, remove it
+if($CheckMDT -eq $true){
+    Get-MDTComputer -description $ComputerName | Remove-MDTComputer
+    }
+
+#If MacAddress exists and we used the -Force switch, remove it
+if($CheckMAC -eq $true){
+    Get-MDTComputer -macAddress $MacAddress | Remove-MDTComputer
+    }
+
+#Create Computer in MDT Database
+$NewMDTComputer = New-MDTComputer -macAddress $MacAddress -description $ComputerName -settings $Settings
+
+#Add role to Computer in MDT Database
+$NewMDTComputer | Set-MDTComputerRole -roles $Role