https://chespone.pages.dev/journal/ CHESPONE is an independent technology lab: embedded systems, Linux infrastructure, databases, networking and automation. en https://chespone.pages.dev/journal/automation-with-esp32/ https://chespone.pages.dev/journal/automation-with-esp32/ Tue, 13 Oct 2026 00:00:00 GMT Study notes on a simple ESP32 control loop with hysteresis and non-blocking timing. ESP32 Automation Arduino Sensors https://chespone.pages.dev/journal/database-design-with-sql-server/ https://chespone.pages.dev/journal/database-design-with-sql-server/ Tue, 13 Oct 2026 00:00:00 GMT Study notes on turning a small domain into normalized SQL Server tables with keys and constraints. SQL Server T-SQL Database design Normalization https://chespone.pages.dev/journal/setting-up-a-linux-server/ https://chespone.pages.dev/journal/setting-up-a-linux-server/ Tue, 13 Oct 2026 00:00:00 GMT Study notes on the basic steps for a fresh Ubuntu Server: updates, a non-root user, SSH keys, a firewall and automatic security updates. Linux SSH Security Ubuntu https://chespone.pages.dev/journal/system-monitoring-and-log-management/ https://chespone.pages.dev/journal/system-monitoring-and-log-management/ Tue, 13 Oct 2026 00:00:00 GMT Study notes on metrics versus logs, reading journald, and keeping alerts few and useful. Monitoring Logs journald Linux https://chespone.pages.dev/journal/vlan-and-network-segmentation/ https://chespone.pages.dev/journal/vlan-and-network-segmentation/ Tue, 13 Oct 2026 00:00:00 GMT Study notes on what VLANs are, how access and trunk ports differ, and why segmenting a network helps. Networking VLAN Security Segmentation