A homeowner has replaced subscription-based smart doorbells with a custom system that runs facial recognition locally on a network-attached storage device in their cupboard. Built using open-source tools and a Raspberry Pi camera, the setup identifies visitors before the user checks the feed, eliminating reliance on third-party cloud services. The project, completed in early September 2026, demonstrates how privacy-focused alternatives can match commercial features without ongoing costs. The system captures video at the doorstep and processes it through AI models stored on the NAS, comparing faces against a local database of known individuals. When someone approaches, the NAS analyzes the image in under two seconds and sends a notification to the homeowner’s phone or smart display with the person’s name or a label like „unknown visitor.” No video leaves the home network, and all data remains encrypted on the NAS.
The homeowner, who prefers to remain unnamed, said the idea came from frustration with monthly fees and data privacy concerns tied to major doorbell brands. How Local Processing Beats Subscription Models By avoiding cloud uploads, the system reduces latency and eliminates the risk of video being stored or analyzed by external companies. The NAS, a mid-range model with a quad-core processor and 4GB of RAM, handles the workload efficiently using lightweight AI frameworks like TensorFlow Lite. The homeowner noted that initial setup took about a weekend, mostly spent training the model with photos of family and frequent visitors.
Unlike commercial doorbells that require subscriptions for features like person detection or package alerts, this version includes those functions at no extra cost after the one-time hardware investment. Can This Work for the Average Homeowner? While the build requires basic networking and Linux knowledge, the homeowner emphasized that step-by-step guides are now available in maker communities. They estimated the total cost at under $150, using a used NAS, a PoE camera, and a Raspberry Pi 4 for preprocessing. Maintenance involves occasional model updates and checking storage space, but no ongoing fees. The homeowner added that neighbors have expressed interest, though widespread adoption depends on simplifying the software installation process. Frequently Asked Questions Does the system work at night or in bad weather? Yes, the camera uses infrared night vision, and the NAS processes images regardless of lighting conditions, though extreme fog or heavy rain may reduce accuracy slightly.
What happens if the NAS goes offline? If the NAS is unreachable, the doorbell falls back to basic motion alerts without identification, but local storage ensures no data is lost during temporary outages. Is it legal to record faces at my front door? In most jurisdictions, recording video of your own property for security purposes is permitted, but users should check local laws regarding audio capture and data storage.