ATEM program tally using PowerShell and Arduino

ATEMTally.ps1

$host.ui.RawUI.WindowTitle = “Arise Tally Monitor”
$stayActive = $true
#Wait for ATEM to be online
Do{
    Start-Sleep -Seconds 10
}
Until(Test-Connection -ComputerName "10.1.1.240" -Quiet)

add-type -path 'C:\vise\SwitcherLib.dll'
$Global:atem = New-Object SwitcherLib.Switcher("10.1.1.240")
$atem.Connect()
$me=$atem.GetMEs()
$Global:me1=$me[0]
$Global:me2=$me[1]

add-type -path 'C:\vise\Solid.Arduino.dll'
$connection = New-Object Solid.Arduino.SerialConnection("COM3",[Solid.Arduino.SerialBaudRate]::Bps_57600)
$Global:session = New-Object Solid.Arduino.ArduinoSession($connection, 2000)

#Tally lights default to all on so you can unplug ones you don't want on if system fails
 $session.SetDigitalPin(11,$true)
 $session.SetDigitalPin(12,$true)
 $session.SetDigitalPin(13,$true)

$Global:activeME = $me2
$Global:Program = $activeME.Program
$Global:Preview = $activeME.Preview
$Global:Program = 0
$timer = New-Object System.Timers.Timer
$timer.Interval = 100 
$timer.AutoReset = $true
$sourceIdentifier = "TimerJob"
$timerAction = { 
    if($Global:me1.Program -eq 10020 -And $Global:activeME -eq $Global:me1){
        $Global:activeME = $Global:me2
        New-BurntToastNotification -Text "ATEM ME1 Un isolated"
    }
    elseif($Global:me1.Program -ne 10020 -And $Global:activeME -eq $Global:me2){
        $Global:activeME = $Global:me1
        New-BurntToastNotification -Text "ATEM ME1 isolated"
    }
    $CurrentProgram = $Global:activeME.Program
    if($Global:Program -ne $Global:activeME.Program){
        if($Global:Program -gt 1 -And $Global:Program -lt 5){
            #turn off current LED
            $Global:session.SetDigitalPin($Global:Program + 9,$true)
        }
        if($CurrentProgram -gt 1 -And $CurrentProgram -lt 5){
                #turn on new program led
              $Global:session.SetDigitalPin($CurrentProgram + 9,$false)
        }
            
        
        $Global:Program = $Global:activeME.Program
    }

}
Unregister-Event $sourceIdentifier -ErrorAction SilentlyContinue
$timer.stop()
$start = Register-ObjectEvent -InputObject $timer -SourceIdentifier $sourceIdentifier -EventName Elapsed -Action $timeraction
$timer.start()

# $activeME.Program=6000
if ($host.name -ne 'Windows PowerShell ISE Host') # or -notmatch 'ISE'
{
  Do{Start-Sleep -Milliseconds 100}
  while($stayActive)
}

See https://ianmorrish.wordpress.com/2016/05/28/control-arduino-gpio-with-windows-powershell-script/
and https://ianmorrish.wordpress.com/2016/05/21/install-standardfirmata-on-arduino-for-gpio/