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''This project started as a way for me to teach students to see andunderstand the ways that engineering can be used for the greater good,''said Kumar Yelamarthi, the professor and project leader.
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The ALS assembly 714 is configured to compare the measured amount of light to a threshold illumination level, and the doorbell camera uses corresponding comparison results to determine its operation mode between a daytime mode and a night mode. Specifically, in some situations, the ALS assembly 714 determines that the mount of light entering the lens assembly 702 exceeds the threshold illumination level, and the doorbell camera 106 enables the daytime mode in which the IR illuminators are turned off. Alternatively, in some situations, the ALS assembly 714 determines that the amount of light entering the lens assembly 702 is not greater than the threshold illumination level, and the doorbell camera 106 enables a night mode in which the IR illuminators are optionally turned on to illuminate the field of view of the doorbell camera 106. In some implementations, two
distinct threshold illumination levels are applied to enable a first type of switching from the daytime mode to the night mode and a second type of switching from the night node to the daytime mode. Thus, use of the ALS assembly 714 can be used to cause switching between the daytime and night modes and enable/disable the IR illuminators in an efficient manner. The doorbell camera 106 may further include a microphone and a speaker. In some implementations, the front cover plate 708 includes a microphone aperture 716 to allow sound signals to reach the microphone concealed within the doorbell camera 106. In some implementations, the device housing 702 includes a plurality of speaker openings 718 at its bottom rim surface. When the doorbell camera 106 is mounted
onto a wall or doorframe surface, the speaker holes 718 are not visible from a gaze of a visitor approaching or standing near the surface, while still being able to broadcast audio messages to the visitor. In embodiments where the doorbell camera 106 includes both the microphone and the speaker, a remote user may review live video streams captured by the camera module of the doorbell camera 106, and have a conversation in real time with the visitor. In some implementations, both the microphone and the speaker of the doorbell camera 106 adopt waterproof features to deter water permeation into the electronic components within the device housing 702 and cause irreversible damages to the electronic components.
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