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--- report:dvp [2026/06/14 23:18] – [7.7.1 Structure] team1
+++ report:dvp [2026/07/18 21:52] (current) – [7.7.1 Structure] epsatisep
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 Overall, the design integrates plant growth, water storage, material selection, and technical functionality into a single compact and cohesive system.
-Following the figure {{ref>fig:assembly_drawing}}, the complete assembly will be divided into individual parts. Based on these, technical drawings and molds will be created to support the manufacturing and assembly process.
 <WRAP centeralign>
 <figure fig:assembly_drawing>
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 {{ :report:solidworks_eps_watertank_1-boss-extrude3.jpg?700 |Solidworks watertank 1-boss-extrude3}}
 <caption>Solidworks watertank 1-boss-extrude3</caption>
+</figure>
+</WRAP>
+The structural integrity of the SolidWorks model with study main pot was evaluated using a Static 1(-Default-) study to determine the Static nodal stress (Stress1) under operational conditions. To simulate the weight of wet soil, a pressure load of 0.00206 N/mm² was calculated using the hydrostatic formula P = ρ · g · h (where ρ = 1400 kg/m³, g = 9.81 m/s², and h = 0.15 m), resulting in a total pressure of 2060.1 Pa. The model, constructed from PET (Part20), was constrained at its bottom surface and at a single screw hole to reflect its actual mounting configuration. The analysis reveals a maximum von Mises stress of 4.254e+05 N/m² (425.4 kPa), with significant stress concentrations localized around the screw hole and the top rim of the pot. While the overall structure remains stable, the Deformation scale of 2055.71 highlights these critical regions, identifying the screw attachment point as the primary area requiring potential reinforcement to ensure long-term durability under the weight of the wet soil.
+Figure 42 shows the structural simulation of the pot.
+<WRAP centeralign>
+<figure fig:structural_simulation>
+{{ :report:structure.jpeg?600 |Structural simulation}}
+<caption>Structural simulation</caption>
 </figure>
 </WRAP>
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 === 7.7.2 Smart System ===
 The smart pot features a side-by-side physical design engineered specifically for gravity-fed irrigation. The water reservoir is positioned adjacent to the plant container but sits at a higher elevation to create natural water pressure. An isolated electronics compartment is located underneath both sections to keep all hardware safely separated from the water lines.
-== Electrical Routing and Power Sequence ==
-Power enters the system from a standard wall socket through a 12V power cable. Inside the electronics compartment, the current flows through the hardware components in the following sequence:
-Master Power Switch: A physical rocker switch embedded into the exterior of the pot acts as the main power control.
-Step-Down Buck Converter: Converts the main 12V supply into a stable 5V logic rail.
+== Electrical Routing and Power Sequence ==
+Power enters the system from a standard wall socket through a 12 V power cable.
-Relay Module: A single relay, connected to the 5V rail, is used to control the 12V motorized ball valve.
+Inside the electronics compartment, the current flows through the hardware components in the following sequence:
-ESP32 Microcontroller: Powered by the 5V rail, it steps power down internally to supply a 3.3V rail for the sensors.
+  * Master Power Switch: A physical rocker switch embedded into the exterior of the pot acts as the main power control.
+  * Step-Down Buck Converter: Converts the main 12 V supply into a stable 5 V logic rail.
+  * Relay Module: A single relay, connected to the 5 V rail, is used to control the 12 V motorized ball valve.
+  * ESP32 Microcontroller: Powered by the 5 V rail, it steps power down internally to supply a 3.3 V rail for the sensors.
+  * Sensor Suite: The capacitive soil moisture sensor is placed directly into the soil and runs on the 3.3 V line. The digital temperature sensor is mounted in a dedicated exterior slot on the side of the pot, utilizing a 4.7 k Ω pull-up resistor between the sensor and the ESP32 data pin.
-Sensor Suite: The capacitive soil moisture sensor is placed directly into the soil and runs on the 3.3V line. The digital temperature sensor is mounted in a dedicated exterior slot on the side of the pot, utilizing a 4.7k Ω pull-up resistor between the sensor and the ESP32 data pin.
 == System Logic and Mobile Application Integration ==
-The ESP32 microcontroller manages two automated routines that communicate directly with a dedicated mobile application:
+The ESP32 microcontroller manages two automated routines that communicate directly with a dedicated mobile application.
 Firstly there's the gravity irrigation and screen time penalty. When the soil moisture sensor detects insufficient levels of moisture, the ESP32 triggers the relay to open the motorized ball valve for a few seconds. Because the reservoir is elevated, water flows naturally into the soil without a pump. In case the user wants more interaction with the plant pot, the user can enable a setting that enables a button in the app which much be pressed manually to open the valve instead.
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 Secondly there's live temperature tracking. The temperature sensor continuously monitors the ambient environment. If the temperature shifts outside the optimal range for the plant, the system sends a push notification to the user's application, advising them to physically relocate the pot to a more suitable environment.
 == Software ==
 As mentioned before, the plant pot works with push notifications and button presses to keep the plant alive. Aside from this function, the app also shows a live stream of the sensor data, allowing monitoring of the state of both the plant and the plant pot.
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 A mechanical error occurred specifically regarding the water flow through the solenoid valve. The system's gravity-fed water reservoir has a water head of 17 cm, which does not generate enough static pressure required for the component. The exact model tested is a pilot-operated solenoid valve, which requires a minimum working pressure range of 0.02 to 0.8 MPa to physically open the internal seal.
-To overcome this pressure limitation for the prototype phase, an 8W submersible pump will be added inside the water reservoir to generate the necessary force. The pump will push water through a translucent pipe. In order to control the submerged water pump second relay module will be used in order to communicate with ESP32 with same principal of work as the solenoid valve combined with first relay. To connect this to the system, a brass 1/2" female hose barb adapter will be used. The valve will screw directly into the adapter, and the smaller inlet of the adapter will connect to the pump's translucent pipe, completing the circuit from the reservoir to the valve. For the prototype the barb adapter has two threads, female one used to connect with the valve and the outer male thread used to connect adapter with threaded hole in side wall of the water reservoir.
+To overcome this pressure limitation for the prototype phase, an 8 W submersible pump will be added inside the water reservoir to generate the necessary force. The pump will push water through a translucent pipe. In order to control the submerged water pump second relay module will be used in order to communicate with ESP32 with same principal of work as the solenoid valve combined with first relay. To connect this to the system, a brass 1/2" female hose barb adapter will be used. The valve will screw directly into the adapter, and the smaller inlet of the adapter will connect to the pump's translucent pipe, completing the circuit from the reservoir to the valve. For the prototype the barb adapter has two threads, female one used to connect with the valve and the outer male thread used to connect adapter with threaded hole in side wall of the water reservoir.
 For the final production unit, the system will return to the original gravity-based design without the need for a water pump. To achieve this, the current pilot-operated valve will be replaced with a zero-pressure valve, such as a direct-acting solenoid valve or a motorized ball valve, which relies solely on gravity to allow water flow. Valve of this type also operates on 12 V, which will not require changes in circuit design.
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 ==== 7.9 Summary ====
-//Provide here the conclusions of this chapter and make the bridge to the next chapter.//
+This chapter explained how Screen2Green was developed from the first idea to the prototype. The process started with the design question and brainstorming. Different pot shapes and water tank ideas were explored, and the final direction was chosen based on water flow, stability, space for electronics, and the overall appearance of the product.
+The final design includes a cork outer structure, a transparent water tank, an inner pot, and a lower space for the electronic components. The water tank was designed for a gravity-fed system, so the shape and valve position were important. The design was also developed through sketches, renders, SolidWorks models, and technical drawings.
+The smart system uses an ESP32, sensors, a relay module, a step-down converter, and a solenoid valve to control the watering process. The mobile application was designed to connect the plant care system with the user’s screen-time habits. The app includes plant monitoring, focus sessions, notifications, history, and profile settings.
+A simplified prototype was built to test the main parts of the system. The hardware tests showed that the power supply, relay module, solenoid valve, and sensor connections worked as expected. The software tests showed that the app could support the main user tasks, although some issues were found in loading, readability, and usability.
+Overall, this chapter shows how the initial idea became a more complete product concept and prototype. The next chapter explains the software system in more detail, including the app structure, data flow, and user interaction.