## 3 Re-Usable Re-Constructible Sensor Device
### Software
#### 3.3.1 Intelligent Calibration
\begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Prototype**} & **Number** & \multirow{2}{*}{**Goal of Prototype**} & **Shape** \\  & **of Steps** & & **Retention** \\  & & & **Ability** \\ \hline \(A\) & 5 & Explored horizontal placement and adjustment of sensors. & Poor \\ \hline \(B\) & 6 & Explored vertical placement and adjustment of sensors. & Poor \\ \hline \(C\) & 5 & Explored a collapsable unit to reduce size when not in use. & Poor \\ \hline \(D\) & 5 & Explored maximum reduction in size allowed by & Poor \\  & & internal components. & \\ \hline \(E\) & 5 & Evolution of the previous prototype, utilizing laser cutter for production. & Improved on \(D\) \\ \hline \(F\) & 8 & Evolution of the previous prototype, utilizing recycled & Same as \(E\) \\  & & archival folders. & \\ \hline \(G\) & 9 & Evolution of previous prototype, refining & Same as \(F\) \\  & & monitor mounting. & \\ \hline \(H\) & 9 & Evolution of previous prototype, refinement of angle & Poor \\  & & setting of the overhead sensor. & \\ \hline \(I\) & 10 & Evolution of previous prototype, exploration of belt angle & Same as \(G\) \\  & & to set sensor position. & \\ \hline \(J\) & 10 & Evolution of the previous prototype and adjustment of the & \\  & & mounting arm to increase structural stability. & Improved \\ \hline \hline \end{tabular}
\end{table} 
Table 1: The progress in design. Figure 3: Success criteria depicting suggested strategies for product/device design. Once the success criteria had been established, concept development proceeded through low-fidelity prototyping to quickly evaluate the design's feasibility. From there, further exploration of form while designing directly for the electrical components led to the development of prototype D (Figure 4). This prototype was then digitized and cut using a laser cutter, resulting in prototype E (Figure 4). Attempts to refine this prototype further came to a standstill when it was realized that it would not be suitable, regardless of how refined it became. As such, the product underwent a complete redesign, resulting in prototype P (Figure 4). With a few final refinements, the end product was deemed suitable for product testing (Figure 5). It utilized coated card, which offered reasonable resistance to moisture and degradation as a result of handling. Its small proportions and dimensions



The number of steps to build the sensor housing and install the electronics inside increased to achieve a more stable device that can provide the functionality of adjusting the sensors. It is difficult to draw a correlation between the number of steps and the device's shape retention ability. However, it can generally be expected that to achieve the functional properties (e.g., rotating the sensors) of the device, the number of assembly steps will increase. The aim would be to minimize the number of steps. ## 4 Trials and Results

As the intended users of the motion sensor device are office workers, participants were selected from a range of university administrative employees. An interest check was emailed to the faculty, and six participants aged between 20 and 50 years were selected from those who volunteered. The small selection of participants was due to several constraining factors, particularly the study's budget and short timeline. ### The Flat-Pack Kit

#### 4.1.1 Hardware

The device designed throughout the study needed to be tested with office workers to evaluate its success, both in fulfilling the research team's requirements and in how well the circular design principles used facilitate emotional connection. For testing, participants were given a kit that contained all the necessary pieces to assemble the device: the pre-folded internal component, the flat piece for the external component, a folding test piece (to learn how to do the folds), a USB-C cable, and the A5 instruction booklet (Figure 6). In this application, the electronic kit consists of an Arduino Nano, which operates at 5 V and is powered by the desktop USB.