Old Dell Laptop and Raspberry Pi 3 Repurposed Into a Full Home Security NVR

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A DIY home security system has been built using a 10-year-old Dell laptop as the central NVR recorder and a 7-year-old Raspberry Pi 3 as a wireless network bridge, avoiding costly hardware upgrades. Three legacy 2018-era Reolink IP cameras feed video to the Dell laptop, which handles recording, storage, and a web interface via Linux systemd services and FFmpeg. The Raspberry Pi 3 serves exclusively as a Proxy ARP Wi-Fi bridge, using the parprouted tool to connect outdoor PoE cameras over Ethernet to the home Wi-Fi network transparently. The project follows frugal engineering principles, prioritising just-enough performance — such as 15–20 FPS recordings and on-demand JPEG previews — over high-spec, over-engineered solutions. Video is stored on a 1TB USB 3.0 SSD, with the entire setup designed to maximise hardware reuse while delivering reliable 24/7 surveillance.

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