  Smart doorbells allow home owners to receive alerts when a visitor is at the
door, see who the guest is, and communicate with the visitor from a smart
device. They greatly improve people's life quality and contribute to the
evolution of smart homes. However, the commercial smart doorbells are quite
expensive, usually cost more than 190 US dollars, which is a substantial
impediment on the pervasiveness of smart doorbells. To solve this problem, we
introduce the Dashbell-a budget smart doorbell system for home use. It connects
a WiFi-enabled device, the Amazon Dash Button, to a network and enables the
home owner to answer the bell triggered by the dash button using a smartphone.
The Dashbell system also enables fast fault detection and diagnosis due to its
distributed framework.
