via Erientes on instructables
The doorbell system is mainly designed for elderly or vision-impaired persons and is pretty straight-forward in its workings. In short, the doorbell switch triggers the camera to obtain footage. Next, faces in the footage are detected and matched with a whitelist and blacklist. The occupant gets clear visual feedback by a clear traffic light display. Hereby, the green, yellow or red light indicate that the person(s) are on the whitelist, unknown to the system or on the blacklist respectively. If the yellow or red light is triggered, the photo is sent by a Telegram bot to inform/warn a relative or caretaker.
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