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+SOFTWARE ENGINEERING DEPARTMENT
+
+SITUATION REPORT 1
+
+Rocket Logging System Architecture
+
+Luís Jesus
+
+August, 2022
+
+Summary
+=======
+
+The main purpose of this report is to develop the first plan of our
+rocket's logging system in order to get a more detailed plan of the next
+tasks that will be done. In this document, we will be talking about our
+overall electronic architecture and some of the possible approaches that
+we may want to implement in order to get the data from the sensors
+chosen by the Electrical Engineering Department.
+
+Data will be received in two different ways: it will be stored in
+comma-separated values (CSV) format in a persistent storage device, such
+as a microSD card, and we'll also need to implement a "real-time\"
+transmission of the data using both radio connection (main real-time
+system) and 4G/5G broadband network. The viability of this last one is
+still under analysis of the Electrical Engineering Team.
+
+Velocity, GPS, altitude, accelerometer, gyroscope and magnetometer are
+the parameters that we want to save and transmit.
+
+Introduction
+============
+
+The Electrical Engineering Department was responsible for selecting the
+most suitable components. We will be working with an ESP32 main board.
+This microcontroller is not very energy demanding and has a quite good
+configuration for the purpose we want it to.
+
+![ESP32 chip pinout (from above)](esp32.jpg){#fig:my_label
+width="8.3cm"}
+
+Along with this board, we'll have five main modules/sensors that will be
+responsible for retrieving information to the ESP32. We will be using a
+BMP280 barometer that communicates either through SPI or I2C, a BNO055
+IMU module communicating through I2C that integrates an accelerometer, a
+gyroscope and a magnetometer, the Ultimate GPS Breakout v3, that will
+also be responsible for velocity tracking and connects via UART and a
+LoRa or XBee antenna module (yet to be decided).
+
+Backup Logging System (microSD card)
+====================================
+
+As mentioned in the introduction, we are planning to implement a
+real-time transmission of the data acquired from the sensors. However,
+radio waves are very prone to be reflected by the soil, at the
+beggining, and there may be some interference caused by other factors
+that we may not be able to predict very accurately.
+
+Considering this, we firstly have to think about a more reliable Logging
+System that is going to be able to save all the important information in
+a persistent storage device, so we can recover the data that was lost as
+soon as we have the rocket "in hands\" again.
+
+The most reasonable way to do this is by implementing a microSD Card
+Module in the circuit; it usually communicates via SPI communication
+protocol (the electronic implementation of this module was not
+considered by the Electrical Engineering Team; they must confirm if it
+can be made considering all the other modules that will be connected).
+
+ESP32 allows us to use Arduino IDE(C/C++ languages). After some quick
+research, I noticed that we will have to use SD.h and SPI.h libraries in
+order to write to the SD card. Beyond these, all the sensors/modules we
+will be using have their own libraries: Adafruit\_BMP280.h,
+Adafruit\_BNO055.h and Adafruit\_GPS.h.
+
+It's not very easy to start trying those implementations without having
+the components. I think it is important to begin by a very simple
+Arduino IDE code (without considering possible optimizations) to
+analyse, for example, how much time it takes to get the data from all
+the sensors and write the string in the .csv file. The first approach
+must be a loop that reads sensors' values at a fixed rate, builds a
+(C-)string and writes it on the file. The frequency of reporting is
+actually quite variable in different projects and I couldn't find a
+consensus, but it would be interesting if we started testing at a rate
+of 10 logs per second (100ms). The most amount of data per second, the
+better, however, we have to pay attention to some details: SD.h library
+automatically writes and updates the file of the SD card in chunks of
+512 bytes (it has its own buffer). The buffer is written to the card
+whenever .flush() or .close() is performed or when it actually gets
+full. Writing in chunks is generally better because we won't need to
+open and close the file every time we want to write (and this consumes a
+considerable amount of time). Considering this, if we rely on the
+library and the card controller to manage the timing of the physical
+storage, we'll have new data being saved every time the buffer gets
+totally filled, so, if we get sensors' information every 100ms, and if
+each line of the file is about 50 bytes, we will have 10 logs being
+effectively appended to the file every one second. Is this enough?
+
+Another way of doing this would be opening and closing the file in each
+iteration, which means that any placement of data into the buffer, in
+each iteration, would be successfully written. However, this can lead to
+a bad performance and we don't want a big delay between all those
+operations. It's a matter of testing and seeing which option is the
+best.
+
+Maybe the best solution is the buffer approach. We need to test if the
+native SD.h library 512 bytes buffer is reliable enough, otherwise, we
+may want to work on our own buffer with a custom size, until we find the
+best balance between writing speed and data safety.
+
+Logging Using Telecommunications
+================================
+
+The team is supposed to use a LoRa or a XBee antenna to send the exact
+same data to the ground station. In order to implement this, we will
+need to configure both the transmitter, to send data, and the receiver,
+that will be on the ground station.
+
+We want this transmission of data to be as quick as possible because we
+want to have live updates of the values we will be tracking. It would
+probably be enough/satisfying if we could send a new csv string to the
+ground station every 100ms as well. However, the velocity of
+transmission will depend on the distance between the receiver and the
+transmitter, which means that at a certain altitude we may face a big
+decrease on the transmission of data, which is not desirable, but I
+actually didn't find clear information about this and the Electrical
+Engineering Team is still deciding the best antennas to use. With more
+information and knowing the boundaries that assure us a stable and
+constant transmission, it will be possible to decide a suitable
+configuration.
+
+Those articles show a C implementation of communication between two
+Arduino or ESP32 using Lora and its own library; they can be a good
+start point. [ESP32 with LoRa using Arduino IDE -- Getting
+Started](https://randomnerdtutorials.com/esp32-lora-rfm95-transceiver-arduino-ide)
+and [Introduction to Lora -- Send data between two Arduino using
+Lora](https://www.electronics-lab.com/project/introduction-lora-send-data-two-arduino-using-lora/).
+
+Veredict
+========
+
+We need to test some basic implementations of Backup Logging System and
+start benchmarking at different rates of data acquisition to check if
+there's significant delay between reading from the sensors and writing
+to the file, in order to have a stable logging system. This is very
+important to make sure that the existing libraries satisfy our needs,
+otherwise, we may need to compact libraries or improve an existing one
+to get better results.
+
+When it comes to the telecommunications, it is still difficult to make a
+deeper study of implementation. We can actually put two microcontrollers
+communicating with each other but, apart from testing (which is very
+important), there is still lack of information from other departments
+such as the position of the antenna(s), if it is going to be a Lora or a
+XBee, how strong the connection is gonna be and how it is going to vary,
+etc. This is a crucial information as it simplifies our research on the
+most suitable libraries and functionalities.
+
+Logging system will have to work flawlessly and coherently: we need to
+make sure that the lag between the logs obtained by these two different
+ways is minimal. This coherence and "parallelism\" between the Backup
+Logging System and the Real-Time Logging System is a little bit hard to
+predict without trying and testing.
+
+A research about 4G/5G broadband networking data transmission and its
+implementation along with the other two would be interesting, but it's
+still not decided if we're actually going to use this (it depends on the
+decision of the Electrical Engineering Department).
+
+References
+==========
+
+\[1\] Arduino Forum;
+
+\[2\] [Arduino Rocket Data
+Logger](https://www.instructables.com/Arduino-Rocket-Data-Logger/).
+
+\[3\] [ESP32 with LoRa using Arduino IDE -- Getting
+Started](https://randomnerdtutorials.com/esp32-lora-rfm95-transceiver-arduino-ide);
+
+\[4\] [Introduction to Lora -- Send data between two Arduino using
+Lora](https://www.electronics-lab.com/project/introduction-lora-send-data-two-arduino-using-lora/);