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View Code? Open in Web Editor NEWDoor Bell 2.0 (or DoorBell20 for short) is a Bluetooth Low Energy (BLE) appliance to monitor a door bell and send notifications whenever the door bell rings. It turns a conventional door bell into a smart door bell that can be connected to the Internet of Things (IoT). Thus, DoorBell20 is the modern version of a door bell, or, as the name suggests, the door bell version 2.0 for the IoT era.
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