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Iterative activities to demonstrate feasibility, including assumptions you made in your analyses or simulations. Have you completed sufficient analysis to ensure that your design will satisfy requirements? Have you included all usage scenarios in your modeling? In order to conserve on power consumption, the design implements a completely mechanical valve. We have come up with a compact design utilizing a float and inverting lever arm to shut off the flow of fuel when the fuel level reaches a certain point. An initial model to test functionality was 3D printed, in order to see if the valve will move properly; an updated model with proper dimensions will be printed to test the seal of the valve. Images: Valve Open (1) and Valve Closed (2) Additionally we further refined our fluid model as seen below. We have decided to use the same model of fluid pump for our testing that is used in the real torch system to create a more realistic test environment and used that pump's operation metrics as a basis for the fluid analysis as seen below. Nordic Semiconductors NRF52840-Dongle. Espressif Systems ESP-32 Copper tape from Bertech (Shared). Pimoroni prototype board. Mean Well 120Vac to 5Vdc power supply. AnySolar High efficiency solar panels. MOSTPLUS Universal Pump Adafruit 1200mAh LiPO battery. Adafruit universal solar LiPO charger. Adafruit 2.1mm barrel jack adapter. STI 3.3V voltage regulator. TDK corp. 10uF ceramic capacitor. Kemet 0.1uF ceramic capacitor.Prototyping, Engineering Analysis, Simulation
Mechanical Analysis:
Torch Head Tank Valve
Electrical Analysis:
By prototyping and initial specifications, the following table of items has been chosen to fit the needs of this project by the standard set by our customer and engineering requirements. By using the power calculations done in phase three we were able to find the right pieces to power the micro-controller and its various peripherals in order to achieve the overall goal. Also by examining the various documentation of each part we found a few simple circuitry requirements needed for these items to function properly together. The tables below indicate the two main areas of electronics for this project. The first is the cumulative array of items needed to make the torch head. The second table details the base station electronics. Torch Head Electronics Base Station Electronics Part Description Part Description 
This dongle was chosen to for a few reasons. The first being its size. Since this development board is so small it will easily fit within the torch head leaving room for all the other pieces. Also this controller has Bluetooth 5.0 capabilities and a decently strong antenna for it which will make it possible to mesh all the torches in a given system together. This board was also chosen for its oscillator. This will be important for measuring the level of the citronella oil in a given torch. 
Similar to the Nordic dongle for the Torch head, this controller was chosen for a few reasons. It was less contained by size but is still quite small to reduce footprint. It also has Bluetooth 5.0 capabilities so that it may communicate to all the torches. I also has WiFi capabilities which is important for it as we need to be able to send the data to an app based user interface. Similar to the Nordic dongle it also has an on board oscillator which will be used to detect the central tank fuel level. 
It is not necessary to use a whole roll of tape per torch, rather about two inches is needed. But, this copper tape is integral in making the capacitive sensor which will monitor the citronella oil level. There are two ways to do this. In one version of the sensor the conductive tape sits on both sides of the tank and the oil or air in between will act as the dielectric. The other way is very similar and models a capacitive touch scheme. By using the tape on both sides of a piece of cardboard (or any other simple dielectric) and placing this on one side of the tank the oil or air near it will change the field and adapt the capacitance of the sensor. The second option is more viable as the distance between the parallel plates in the first option may make it difficult to detect a change in the overall capacitance. By changing the capacitance we can detect a change in the oscillation of the RC time constant using the Nordic dongle's built in oscillator and know exactly when there is or is not oil present. 
This prototyping board is here for just that. Because the Nordic dongle is so small and uses uncommon GPIO solder joints this board makes it easier for us to test the system iteratively. It was also chosen because its price is significantly lower than most prototype boards, therefore we can order several of them and increase the overall test scale of the system. 
To power the micro-controller requires a 3.3V source. Because the base will have access to 120Vac the power supply will not have to rely on the sun. This power supply will be plugged into a 120V socket and can power the base station as long as it can survive the environment. 
These panels were chosen because they are efficient for their size. These panels needed to fit on the top of the torch and power a system of electronics. As such they needed to be small and efficient which they are. 
Because the pump calculations have been blocked the current pump is the same as the original design by the customer. This is subject to change when the calculations are complete or upon this pumps failure. 
Based off our power analysis a 100mAh battery fully charged would last one day powering the system. So, to ensure the system does not fail if the area remains cloudy for an extended period a larger battery that could last over a week was chosen as it can still fit inside the torch while ensuring that the system will not fail because of weather. N/A N/A 
This charger was chosen to make sure the least amount of electricity is lost when transferring from panel to battery and to be able to charge and use the battery at the same time. It is also very useful for prototyping as it can be interfaced with through USB-C or though its pinout for bread-boarding purposes. N/A N/A 
The purpose of this piece is to ensure the least number of open solder joints within the solar charging system. To perform as we need it to the panels need to be wired in parallel which means there will be at least one open solder joint coming to the charger board. This adapter ensures we can hide the open wire and make use of the built in barrel jack on the board reducing a few of our risks. N/A N/A 
Unfortunately most batteries operate at 3.7V. Our system runs on voltage between 3.3V and 3.6V so we needed to make use of a voltage regulator. This integrated circuit will ensure we do not over voltage any of the components and fry the system. N/A N/A 
This is a necessary capacitor for our regulator circuit. Without this component the regulator would not function properly and the system could fail. N/A N/A 
This is a necessary capacitor for our regulator circuit. Without this component the regulator would not function properly and the system could fail. N/A N/A