## 3 Results
### Materials and Devices Used in the Implementation of Test Stands
#### 3.1.3 Implementation Details in the Master Component  
As previously outlined, the electronic components described previously were integrated into an experimental physical prototype, as illustrated in Figure 5. This prototype, designed for the detection of lower-limb length discrepancy (LLD), allows for the real-time display of the collected and analyzed data. The power supply for the prototype is provided via the USB connection to a 5 V source, ensuring stability and continuous operation. Although the system is currently powered through a physical electrical connection, the prototype was designed to integrate an internal battery, which would allow for greater mobility and independence in its use. This innovative approach was adopted to ensure system stability during experimental testing on the stand, thus minimizing potential interruptions caused by voltage fluctuations or the loss of connection when using an uncalibrated battery that does not currently meet the operational requirements of the Master component.  
\begin{table}
\begin{tabular}{c c} \hline \hline
**Parameters** & **Technical Specifications** \\ \hline Communication & I2C and IIC \\ Resolution & 128 \(\times\) 64 \\ \hline Field of view & \textgreater{}160\({}^{\circ}\) \\ \hline Power consumption & 0.08 W \\ \hline Supply voltage & 3–5 VDC \\ \hline Operating temperature & \textasci{-}30\(\sim\)70 \({}^{\circ}\)C \\ Chip & SSD1306 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Technical characteristics of the 0.96\({}^{\circ}\) OLED display [34].  
\begin{table}
\begin{tabular}{c c} \hline \hline
**Parameters** & **Technical Specifications** \\ \hline Microcontroller & ESP32-WROO-32-REV1 \\ Connector & MicroUSB \\ \hline Supply voltage & 3.3–5 VDC \\ \hline Operating voltage & 3.3 VDC \\ \hline Number of digital pins (I/O) & 26 \\ \hline Number of analog input pins & 12 \\ \hline IC communication & CP2104 \\ \hline Maximum CPU frequency & 240 MHz \\ \hline Battery charging current (max.) & 500 mA \\ \hline \hline \end{tabular}
\begin{tabular}{c} Dual core Xtensa (32 bit LX6 \\ microprocessor, operating frequency at \\ 160/240 MHz \\ \end{tabular} \\ \hline SRAM & 520 KB \\ \hline Flash & 4 MB \\ \hline Wi-Fi & 802.11 b/g/n \\ Bluetooth & V 4.2 DR/EDR si BLE \\ \hline \hline \end{tabular}
\end{table}
Table 3: The technical characteristics of the Node MCU, Lolin 32 [33].  
The physical prototype was mounted on a rigid plate positioned at the midpoint of its length, constructed from an aluminum alloy to ensure minimal weight. As illustrated in Figure 6, the extremities of the rigid bar were positioned on the suprapatellar regions of the anatomical mannequin, which was situated in a seated position. This configuration simulated the clinical situation of a patient with a prosthetic lower limb.  
Two medical orthoses were integrated at the ends of the bar, surrounding the distal region of the thigh, with the intention of increasing stability during testing and minimizing errors, without the intention of their use on a real patient.  
It is important to mention that the rigid bar is securely fixed to the suprapatellar regions of the mannequin through fastening elements, allowing a solid and non-elastic connection between the ends of the bar and the mannequin. During the experimental tests, the prototype enables the evaluation of the LLD detection and compensation system's functionality, with all components integrated and assembled to ensure an assessment as close as possible to real clinical scenarios.