jiggler.ps1

Add-Type @"
using System;
using System.Runtime.InteropServices;

public class Mouse {
    [DllImport("user32.dll")]
    public static extern bool SetCursorPos(int X, int Y);

    [DllImport("user32.dll")]
    public static extern bool GetCursorPos(out POINT lpPoint);

    public struct POINT {
        public int X;
        public int Y;
    }
}
"@

# get current position as starting point
[Mouse+POINT]$pos = New-Object Mouse+POINT
[Mouse]::GetCursorPos([ref]$pos) | Out-Null

$startX = $pos.X
$startY = $pos.Y
$size   = 50    # small square side in pixels
$delay  = 5     # seconds between moves

while ($true) {
    # move right
    [Mouse]::SetCursorPos($startX + $size, $startY)
    Start-Sleep -Seconds $delay

    # move down
    [Mouse]::SetCursorPos($startX + $size, $startY + $size)
    Start-Sleep -Seconds $delay

    # move left
    [Mouse]::SetCursorPos($startX, $startY + $size)
    Start-Sleep -Seconds $delay

    # move up (back to start)
    [Mouse]::SetCursorPos($startX, $startY)
    Start-Sleep -Seconds $delay
}