Blog - Don Zalmrol

A Chernobyl visit with an Arduino Geiger counter

By Laurens Gregoir Sunday 01 September 2019ElectronicsArduino, Arduino Geiger Counter, Chernobyl, Exclusion Zone, Geiger Counter, Geiger Müller, Pripyat, SBM-20, SI-3, Terra-P, Tubes, ValvesNo Comments

Introduction Perhaps an odd project for my site but with some friends we visited the Chernobyl exclusion zone, small town of Zalyssa, city of Pripyat (Get out of here Stalker), Chernobyl (Vladimir Ilyich Lenin) nuclear power plant and Duga 3 Over The Horizon (OTH) Radar installation receiver on the 29th of…

Upload User Photos to SharePoint Online Library

By Laurens Gregoir Tuesday 10 February 2026ITPowershell, SharepointNo Comments

Simple script to upload user photos to a SharePoint Online library. The photos are pulled from active directory in a separate script. ### # Upload User Photos to SharePoint Online Library ### # This script is designed to upload user photos to a SharePoint Online library. It first removes existing…

Generate Viva Engage communities and members overview with MS Graph

By Laurens Gregoir Tuesday 10 February 2026ITEntra ID, MS Graph, Powershell, Viva EngageNo Comments

The code below will allow you to generate and export all the Viva Engage communities and members in 3 CSV files. Code # How to Export Viva Engage Community, Ownership, and Membership Details to CSV using Microsoft Graph API and PowerShell # This script connects to Microsoft Graph using certificate-based…

Unifi <-> OPNsense/pfSense Wireguard S2S Tunnel

By Laurens Gregoir Wednesday 03 December 2025ITopnsense, pfsense, S2S, Ubiquiti, Unifi, WireguardNo Comments

Many of the guides you can find online only provide you the information to set up a Site to Client (S2C) e.g. your network to a laptop, ... But not this one! The guide below will give you a step-by-step guide on how to set up an actual Site to…

Entra ID inactive guest account cleanup with exclusion groups script

By Laurens Gregoir Tuesday 18 November 2025ITAzure AD, Entra ID, Guest Accounts, Microsoft, PowershellNo Comments

The script below will help you to automate your inactive guest account cleanups in Entra ID (Azure AD). The script handles nested groups in your main YOURGROUPNAMEHERE group, it will exclude any user or group it finds. The reason why adding your users to groups is to work with Entra…