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report [2025/06/15 23:17] – [3.8 Procurement] team1report [2025/06/22 18:33] (current) – [3.11 Sprint Outcomes] team1
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 ^ Task    ^ Proposed date ^ Effective date^  ^ Task    ^ Proposed date ^ Effective date^ 
 |Choose the project proposal| 2025-03-01    |2025-02-28| |Choose the project proposal| 2025-03-01    |2025-02-28|
-|System Diagrams & Structural Drafts| 2025-03-12    |2025-03-12 and final version at |+|System Diagrams & Structural Drafts| 2025-03-12    |2025-03-12 and final version at 2025-05-28 |
 |Project Backlog, Global Sprint Plan, Initial Sprint Plan and Release Gantt Chart| 2025-03-15    |2025-03-15| |Project Backlog, Global Sprint Plan, Initial Sprint Plan and Release Gantt Chart| 2025-03-15    |2025-03-15|
 |List of Components and Materials| 2025-03-19    |2025-03-19| |List of Components and Materials| 2025-03-19    |2025-03-19|
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 |Interim Report | 2025-04-06 |2025-04-06| |Interim Report | 2025-04-06 |2025-04-06|
 |Interim Presentation| 2025-04-10 |2025-04-10| |Interim Presentation| 2025-04-10 |2025-04-10|
-|3D model video| 2025-04-15 |2025-04-15 and the final version at |+|3D model video| 2025-04-15 |2025-04-15 and the final version at 2025-05-28 |
 |Final List of Materials| 2025-04-29 |2025-04-29| |Final List of Materials| 2025-04-29 |2025-04-29|
 |Refined Interim Report| 2025-05-02 |2025-05-02| |Refined Interim Report| 2025-05-02 |2025-05-02|
 |Packaging Solution| 2025-05-14 |2025-05-14| |Packaging Solution| 2025-05-14 |2025-05-14|
 |Functional Tests| 2025-05-28 |2025-05-28| |Functional Tests| 2025-05-28 |2025-05-28|
-|Final Report, Presentation, Video, Paper, Poster and Manual| 2025-06-15 || +|Final Report, Presentation, Video, Paper, Poster and Manual| 2025-06-15 |2025-06-15| 
-|Final Presentation| 2025-06-18 || +|Final Presentation| 2025-06-18 |2025-06-18| 
-|Refined Final Report| 2025-06-25 || +|Refined Final Report| 2025-06-25 |2025-06-22|
-|Prototype and User Manual| 2025-04-10 ||+
 </WRAP> </WRAP>
 </table> </table>
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 | O         | Functional Tests    | Done      |   | O         | Functional Tests    | Done      |  
 | P         | Final Report    | Done      |   | P         | Final Report    | Done      |  
-| Q         | Presentation    | Ongoing      |    +| Q         | Presentation    | Done      |    
-| R         | Video    | Ongoing      |  +| R         | Video    | Done      |  
 | S         | Paper    | Done      |   | S         | Paper    | Done      |  
 | T         | Poster    | Done      |   | T         | Poster    | Done      |  
 | U         | Manual    | Done      |   | U         | Manual    | Done      |  
-| V         | Upload    | To do      |  +| V         | Upload    | Done      |  
 | W         | Prototype    | Done      |   | W         | Prototype    | Done      |  
 | X         | Change the interim report    | Done       | | X         | Change the interim report    | Done       |
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 | 13        | P     | 4             | All      | All | | 13        | P     | 4             | All      | All |
 | 13        | Q     | 4             | All      | All | | 13        | Q     | 4             | All      | All |
 +| 14        | R     | 3             | Pierre      | Pierre |
 +| 14        | P     | 4             | All      | All |
 +| 14        | Q     | 4             | All      | All |
 +| 14        | V     | 4             | All      | All |
 </WRAP> </WRAP>
 </table> </table>
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 | 13        | P     | 4             | All      | All |Ongoing| | 13        | P     | 4             | All      | All |Ongoing|
 | 13        | Q     | 4             | All      | All |Ongoing| | 13        | Q     | 4             | All      | All |Ongoing|
 +| 14        | R     | 3             | Pierre      | Pierre |Done|
 +| 14        | P     | 4             | All      | All |Done|
 +| 14        | Q     | 4             | All      | All |Done|
 +| 14        | V     | 4             | All      | All |Done|
 </WRAP> </WRAP>
 </table> </table>
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 </WRAP> </WRAP>
 In this sprint, the planned work was developed during the sprint. However, the team added a task on day three related to load and stress simulations. All this information is present in image {{ref>figure-sprint-13}}. In this sprint, the planned work was developed during the sprint. However, the team added a task on day three related to load and stress simulations. All this information is present in image {{ref>figure-sprint-13}}.
 +
 +
 +<WRAP round box>
 +<table table-sprint-14>
 +<caption>Sprint 14 - 12/05 to 18/06(velocity planned: 1w 1d 1h 20m and real velocity: 1w 6h 20m)</caption>
 +<WRAP center>
 +^ Product Backlog Item    ^ Assignee          ^ Planned Effort [h]     ^ Status ^ 
 +|Minute and week report |Tomás|0.5|Done|
 +|Refined list of materials|Pierre|5|Done|
 +|Finish the video|Pierre|8|Done|
 +|Finish the presentation|All|6|Done|
 +|Explanation of power budget and electrical diagram|Pierre|16|Done|
 +|Chapter 4|Aaro|6|Done|
 +|Chapter 7|Pierre and Waad|8|Done|
 +</WRAP>
 +</table>
 +</WRAP>
 +
 +<WRAP>
 +<figure figure-sprint-14>
 +{{ :burndown_chart_-_sprint_14.png?600 |}}
 +<caption>Burndown chart - sprint 14 (available capacity: 10h per person Friday: 3h Monday: 3h Tuesday: 4h)</caption>
 +</figure>
 +</WRAP>
 +In this sprint, the planned work was developed during the sprint. All this information is present in image {{ref>figure-sprint-14}}.
 ==== - Sprint Evaluations ==== ==== - Sprint Evaluations ====
  
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 The middle steel profile also incorporated a technical opening, which allowed cables to safely and neatly pass through the floor to and from the table, benches, and roof components. The technical opening denies any mechanical damage to wiring while storing them out of weather conditions, while maintaining a clean and manageable energy distribution system throughout the structure. The middle steel profile also incorporated a technical opening, which allowed cables to safely and neatly pass through the floor to and from the table, benches, and roof components. The technical opening denies any mechanical damage to wiring while storing them out of weather conditions, while maintaining a clean and manageable energy distribution system throughout the structure.
 As for the sockets, usb-c ports, and control switches have been carefully positioned- especially on the side of the table- to allow for universal and ergonometric functionality including for wheelchair users.  As for the sockets, usb-c ports, and control switches have been carefully positioned- especially on the side of the table- to allow for universal and ergonometric functionality including for wheelchair users. 
 +
 +
 +**__Material selection__**
 +
 +The material selection for this workstation design was based on structural performance, durability, cost, and appearance. Each detail was selected for the functional and aesthetic requirements of an outdoor workstation. 
 +The foundation is a concrete base that has good stability and compressive strength. This ensures that the entire structure is well anchored in relation to the environment and can withstand environmental pressure like wind and uneven ground. The team then used wooden joists to construct wooden decking, which was chosen for its natural appearance and warm texture, with durable properties for a weathered and stable walking surface.
 +The table and benches- the seating surfaces are composed of **oak wood** for durability, exterior weather resistance, and appearance. The legs of each bench and the table are made of aluminium for its corrosion resistance and lightweight characteristics, which are required in the design of modular outdoor structures. One bench includes a back rest, which consists of oak wood slats supported by an aluminium frame on the top and bottom for rigidity and comfort.
 +
 +Another feature at the bottom of the structure is a custom **aluminium** footrest in a chargable, interesting, and atypical shape. The footrest contributes to user comfort, and adds to the overall appearance, by introducing a dynamic shape at the level of the ground.
 +The central structural column is made from **S355 structural steel**. While aluminium was initially considered for its lightness, S355 steel was ultimately chosen due to its superior strength and lower cost for structural applications.
 +
 +S355 steel provides the necessary load means for the central core to take the upper structures and the roof. The central structure has a cylindrical wooden form cover, the wooden form helps to provide warmth and softness visually, while also integrating the central core as part of the rest of the wood elements in the design.
 +The roof is also made from S355 steel to ensure it is able to safely support the loading of the photovoltaic system and retractable shade systems. The strength and stability of steel is important to manage wind load and the weight of the photovoltaic system.
 +
 +Lastly, at the nase of the central structure, a custom aluminium box is incorporated to hold electrical components like batteries, controllers, and other electronics. Aluminium is perfect for this purpose because of its properties such as corrosion resistance, machinability, and thermal properties, keeping sensitive components safe in an outdoor application.
 +
  
 **__Drawings__** **__Drawings__**
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-=== - Smart System ===+=== - Electrical System ===
  
-== Hardware == +==Electrical and Smart-System Components==
-  +
- +
-Include and explain in detail the:  +
-(//i//) black box diagram; +
-(//ii//) hardware component selection (use tables to compare the different options for each component; +
-(//iii//) detailed schematics; +
-(//iv//) power budget. +
- +
-**Electrical and Smart-System Components**+
  
 This subsection justifies the selection of photovoltaic, storage, power conversion, and control parts that allow the bench to operate off-grid without any external power source.   This subsection justifies the selection of photovoltaic, storage, power conversion, and control parts that allow the bench to operate off-grid without any external power source.  
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   * **Smart AC control:**     * **Smart AC control:**  
-    The inverter is turned on only when a laptop is detected. When no AC load is present for ten minutes, the ESP32 switches it off, cutting standby loss from 6 W to 0.6 W.+    The inverter is turned on only when a laptop is detected. When no AC load is present for ten minutes, the ESP32 switches it off, cutting standby loss from 6 W to 1 W.
  
   * **Battery protection:**     * **Battery protection:**  
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 The operating concept follows an energy priority model: when the sun is shining, the solar modules first cover the current loads and charge the battery at the same time. If the charge level drops below 30%, the control system first deactivates the USB-C charging ports, then the linear drives and finally the lighting. However, basic services such as WLAN, sensors and control remain in operation at all times. All performance and measurement data is provided every minute via the WLAN so that energy flow, usage behavior and weather influences can be evaluated in detail. This creates a low-maintenance, efficient and safe outdoor workstation that remains self-sufficient even during long periods of bad weather. The operating concept follows an energy priority model: when the sun is shining, the solar modules first cover the current loads and charge the battery at the same time. If the charge level drops below 30%, the control system first deactivates the USB-C charging ports, then the linear drives and finally the lighting. However, basic services such as WLAN, sensors and control remain in operation at all times. All performance and measurement data is provided every minute via the WLAN so that energy flow, usage behavior and weather influences can be evaluated in detail. This creates a low-maintenance, efficient and safe outdoor workstation that remains self-sufficient even during long periods of bad weather.
  
-== Software == +**Power Budget** 
-Describe in detail the:  + 
-(//i//) use cases or user stories for the smart device and app; +In this section, the energy budget {{ :co-venient_power_budget_calculation.xlsx | }} for the individual workstation is documented.  All currents are taken out of the component's data sheet and realistic usage times are converted into a daily energy requirement and then compared with photovoltaic (PV) generation and battery capacity. The dominant consumers are listed below in Table {{ref>power-budget-calculations}}. 
-(//ii//) selection of development platforms and software components (use tables to compare the different options); + 
-(//iii//) component diagram.+Load inventory and duty-cycle assumptions 
 + 
 +<WRAP round box 800px> 
 +<table power-budget-calculations> 
 +<caption>Power Calculations</caption> 
 +<WRAP center> 
 +^ Number ^ Sub-system (model) ^ Rated power [W] ^ Units ^ Daily runtime ^ Energy / day [Wh] ^ Share ^^ 
 +| 1 | USB-C fast-charge ports (3 × 45 W) | 45 | 3 | 8 h | 1 080 | 40.7 % | 
 +| 2 | Schuko laptop outlets (via inverter) | 64.4 | 2 | 8 h | 1 030 | 38.8 % | 
 +| 3 | Wi-Fi AP (MikroTik wAP ac V2) | 9 | 1 | 24 h | 216 | 8.1 % | 
 +| 4 | Micro-controller (ESP32 Dev Board) | 1.3 | 1 | 24 h | 30 | 1.1 % | 
 +| 5 | USB-hub self-draw (Coolgear DIN) | 2.4 | 1 | 8 h | 19 | 0.7 % | 
 +| 6 | LED lighting (3 m strip) | 5.0 | 3 | 4 h | 60 | 2.3 % | 
 +| 7 | Table linear actuators (3 pc) | 48 | 3 | 15 min | 36 | 1.4 % | 
 +| 8 | Bench linear actuators (6 pc) | 60 | 6 | 15 min | 90 | 3.4 % | 
 +| 9 | Inverter (Phoenix 12/500, active) | 9.6 | 1 | 8 h | 77 | 2.9 % | 
 +| 10 | MPPT controller (SmartSolar 150/100, standby) | 0.48 | 1 | 20 h | 9.6 | 0.4 % | 
 +| 11 | SmartShunt + Lynx (quiescent) | 0.03 | 1 | 24 h | 0.7 | 0.0 % | 
 +| 12 | Sensors (light / T-H-P, 5 nodes) | 0.05 | 5 | 24 h | 6 | 0.2 % | 
 +|   | Total daily load |   |   |   | 2 655 Wh | 100 % | 
 +</WRAP> 
 +</table> 
 +</WRAP> 
 + 
 +During a typical eight-hour user shift, the Schuko sockets remain permanently active; this means that the inverter and the downstream USB hub also run for the entire working time. The WLAN access point, control electronics and all environmental sensors, on the other hand, work continuously to ensure round-the-clock connectivity and data collection. The linear actuators are rarely used, so their total operating time is estimated at around fifteen minutes per day. Finally, the LED lighting is only required in the evening hours via sensor control and is on for an average of around four hours a day. In total, all these components add up to an power drainage of 2 655 Wh.  
 + 
 +Energy is generated by a photovoltaic array consisting of two Jinko Tiger Pro modules connected in series, each with a peak output of 535 W. Together, these modules provide a generator output of around 1,070 Wh at an open-circuit voltage of around 98 V. Even in the worst winter month in Porto, an average of four full load hours can be achieved, which corresponds to a daily yield of around 4,280 Wh. This means that the system generates around 1.6 times the daily consumption, meaning that the battery is usually fully charged by early afternoon, even in December. 
 + 
 +Three 12 V, 50 Ah LiFePO4 batteries connected together in a series provide the energy storage. This provides a gross capacity of 1,920 Wh. However, only around 90% of this is used to preserve the service life, which is equivalent to 1,728 Wh. This reserve is enough to last around 16 hours without any solar power. This means it can last comfortably through the night and into the early morning. When the sky is clear, the battery will be fully charged again in about two hours thanks to the large output of the solar panels. The battery only works as a night buffer because there is no need to have a multi-day storage system.
  
 +**Conclusion**  
 +Daily solar panels harvest, around 4.3 kWh, exceeds the 2.7 kWh load, giving a comfortable margin. The 1.7 kWh battery bridges a full night and recharges quickly. Wiring and converters still have reserve capacity, so roughly 300 W of extra load or an additional panel and battery could be added without redesign. The workstation is therefore solar panel dominant with an overnight buffer, meeting the energy-first design goal.
 ==== - Packaging ==== ==== - Packaging ====
  
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 In the prototype, due to the decision to prepare it with lightweight materials and scaled, as well as due to lack of access to the mechanical components at the moment of assembling it, the prototype does not include automatic adjustments of the originally ergonomic benches and table.  In the prototype, due to the decision to prepare it with lightweight materials and scaled, as well as due to lack of access to the mechanical components at the moment of assembling it, the prototype does not include automatic adjustments of the originally ergonomic benches and table. 
-The initial idea to counter this obstable was to use the motor, but the scale of the prototype made it impossible to attach it to work efficiently. +The initial idea to counter this obstacle was to use the motor, but the scale of the prototype made it impossible to attach it to work efficiently. 
  
 Therefore, the prototype in the field of adjustability sets on the illustration of the core idea of how the product should work, although the adjustments still have to be done manually.  Therefore, the prototype in the field of adjustability sets on the illustration of the core idea of how the product should work, although the adjustments still have to be done manually. 
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 == Hardware tests == == Hardware tests ==
  
-Perform the hardware tests specified in [[report|1.6 Tests]]. These results are usually presented in the form of tables with two columns: Functionality and Test Result (Pass/Fail).+The hardware measurement tests were performed as specified in  [[report|1.6 Tests]] . The hardware tests measure the working functions of the physical hardware and the extent to which they align with the intended design objectives. The results of the tests are summarized below: 
 + 
 + 
 +<caption>Functional results</caption> 
 +<WRAP center> 
 +^ Use case ^ Result ^ 
 +| UC1 - Automatic Lighting | Pass | 
 +| UC2 - Adjustable work surface height | Pass | 
 +| UC3 - Wi-Fi communication | Pass | 
 +| UC4 - Sustainable energy autonomy| Fail | 
 +| UC5 - Manually operated awnings | Pass | 
 +</WRAP> 
 + 
 + 
 + 
 +The adjustable work surface is manually operated on the prototype. 
 + 
 +Some mechanical functionalities weren't implemented due to reflectivity with material paramaters and limitations of scaling. The automatic adjustment of benches and table surfaces, the team first intended to use a motor, however the limit of the prototype in scaling and mechanism access made this impossible. Leading to use of manual operation instead to simulate the intended adjustment capabilities. The smart control system is based on the ESP32 microcontroller which incorporates an OLED screen and built-in Wi-Fi module, as well as communication to TSL2561 luminosity sensor and HTU21D for temperature and humidity sensing and reproduction.
  
 == Software tests == == Software tests ==
  
-Software tests comprise:  +The evaluation of the software occurred in three key areas; functional, performance, and usability. 
-(i) functional tests regarding the identified use cases / user stories; + 
-(ii) performance tests regarding exchanged data volume, load and runtime (these tests are usually repeated 10 times to determine the average and standard deviation results); + 
-(iii) usability tests according to the [[https://www.usability.gov/how-to-and-tools/methods/system-usability-scale.html|System Usability Scale]].+**//1. Functional Tests//** 
 + 
 +The functional tests focused on specific use cases, and to verify that each module of the software would function correctly. The software performed the following tasks : 
 + 
 +(1) measured real-time ambient light using the TSL2561 sensor  
 + 
 +(2) tracked temperature and humidity using the HTU21D sensor  
 + 
 +(3) controlled an LED automatically, based on the ambient light conditions 
 + 
 + (4) displayed the ambient data output via an OLED display  
 + 
 +(5) created a Wi-Fi Access Point setup and tracked the devices connected to the access point, via the MAC address.  
 + 
 +The main control loop performed all of these tasks (1-5) at the same time and refreshes every ~2 seconds. The LED would turn on when the ambient light levels fell below 1 lx. And the ESP32 access point would be able to identify new devices being connected, and the MAC address would be logged in the terminal.  
 + 
 +**//2. Performance Tests//** 
 + 
 +Though specific numerical data about load, run-time, throughput, etc., was not presented in this version of the project, the performance testing did confirm that the 2 sec refresh cycle of the control loop was consistent throughout the entire testing process. In later versions, we will present averaged results over 10 cycles,  with standard deviation data to support the consistency and performance of the software simulation under varying conditions.
        
 +**//3. Usability Tests//**
 +
 +A formal usability review using the System Usability Scale (SUS) is planned for the next testing cycles (future evaluation). The current prototype supports basic user interactions (i.e., lighting feedback, visibility of data on OLED), and further evaluation is needed to examine the intuitiveness, usefulness, and accessibility — especially during full-scale deployment.
 ==== - Summary ==== ==== - Summary ====
-//Provide here the conclusions of this chapter and make the bridge to the next chapter.//+ 
 +This chapter presented the overall development process of the Co-venient outdoor workstation, detailing its evolution from concept to practical implementation. Key activities undertaken in this process included defining design requirements, selecting material types and sources, structural and electrical design, packaging considerations, and creating a staged prototype that functioned. Specific consideration was given to incorporating sustainability, ergonomics, and user needs in every design decision. The smart control system, built using the ESP32 microcontroller platform was developed and examined to test responsive environmental sensing, automated lighting capability, and networking ability. Functional and software testing validated several of the anticipated use case scenarios, demonstrating both the feasibility and potential of the concept. The prototype served as a proof of concept that demonstrated how the final product would work in a real world application. The next chapter will provide a critical reflection on the project, including lessons learned and directions for future development.
  
 ===== - Conclusions ===== ===== - Conclusions =====
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