Device Connectivity
Electrical Connectivity
The electrical connectivity of the device is shown in Figure 1. This figure demonstrates how the power supply connects to both the voltage regulator and a power switch in the bottom left corner of the image. In addition it demonstrates how the voltage regulator is connected to the electret microphone, the digital-to-LED drivers, and the LED screens. This image also shows how the electret microphone transduces incoming acoustic signals to electrical signals and outputs these signals through the amplifier. The amplifier then transmits these signals to the analog-to-digital converter of the microcontroller. If the tactile switch, also shown in the diagram, is turned on, the signal is able to be converted into a digital signal for processing and analysis. The result of the analysis is output from the microcontroller to the 2 digital-to-LED drivers. These drivers are then capable of outputting seven signals to each of the display digits in the LED screen to show the percentage likelihood the individual has pneumonia.
Physical Connectivity
The most central physical device component is the printed circuit board, a schematic of which is shown in Figure 2. The electret microphone, LED screens, and lithium battery interface with the PCB through wire-to-board connectors. The connections between the inputs and outputs of these components are displayed are shown in this figure.
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Device Casing
The case of the device is designed to fit specific components chosen for the design. The computer-aided-design figures for this device, shown in Figure 3 and Figure 4, demonstrate the geometry of the device enclosure. Using the exact dimensions of each component, in addition to the physical and electrical connectivity mentioned previously, the mechanical case depicted below was created. It is separated into four parts to facilitate the 3D printing process. Two views are shown of the mechanical diagram: one demonstrates the realistic size and shape of the device and the other exposes the device interior.