<p>This report is the written part of a bachelorthesis on the computer engineering program at</p><p>University of Halmstad. The project was a cooperate project that where done together with</p><p>Free2move Holding AB. Free2move is a company with eight employees in Sweden and four in</p><p>Malaysia. The company is today developing Bluetooth modules and RFID chips. The market for</p><p>this kind of products is growing very rapidly, last year it grew 71 percent. The most important</p><p>market for Free2move is to provide other developers with Bluetooth modules.</p><p>Free2move has recieved some inquiries from previous customers about a system that would allow</p><p>communication between two or more persons. After recieving this, Free2move started to evaluate</p><p>the grounds for such a protocol and also how the transmisison time slots should be distributed</p><p>among the parties. The result was planned to manage an infinite number of users and the possibility</p><p>for two users to talk simultaneously.</p><p>The goal of the project was to develop a prototype of a reciever with functionality according to a</p><p>specification and protocol developed by Free2move. One part of the project where to do a research</p><p>of the market to find suitable hardware for the reciever, at least a tranciever/reciever and a processor</p><p>with DA-converter. Factors such as pricing, power cousumption and size should be take in</p><p>consideration during the researchphase.</p><p>Free2move had explicity said that they where intrested in a microprocessor from Texas that had low</p><p>power comsumption and that we should concider takingthat one. The PIC microprocessor from</p><p>Micrichip was one of the other candidates. Since the specification of the protocol demanded a DAconverter</p><p>with 16 bit resouliton an external codec was neccesary to be implemented in to the</p><p>construction.</p><p>During the project negotiations about the structure and functionality of the protocol where still not</p><p>finished. This resulted in a turn in what the goal of this project was, and a new goal where set. The</p><p>goal where now to develop and construct a reciever and a transmitter and make a research of how</p><p>well diffrent kind of protocol would perform.</p>

This report is the written part of a bachelorthesis on the computer engineering program at University of Halmstad. The project was a cooperate project that where done together with Free2move Holding AB. Free2move is a company with eight employees in Sweden and four in Malaysia. The company is today developing Bluetooth modules and RFID chips. The market for this kind of products is growing very rapidly, last year it grew 71 percent. The most important market for Free2move is to provide other developers with Bluetooth modules. Free2move has recieved some inquiries from previous customers about a system that would allow communication between two or more persons. After recieving this, Free2move started to evaluate the grounds for such a protocol and also how the transmisison time slots should be distributed among the parties. The result was planned to manage an infinite number of users and the possibility for two users to talk simultaneously. The goal of the project was to develop a prototype of a reciever with functionality according to a specification and protocol developed by Free2move. One part of the project where to do a research of the market to find suitable hardware for the reciever, at least a tranciever/reciever and a processor with DA-converter. Factors such as pricing, power cousumption and size should be take in consideration during the researchphase. Free2move had explicity said that they where intrested in a microprocessor from Texas that had low power comsumption and that we should concider takingthat one. The PIC microprocessor from Micrichip was one of the other candidates. Since the specification of the protocol demanded a DAconverter with 16 bit resouliton an external codec was neccesary to be implemented in to the construction. During the project negotiations about the structure and functionality of the protocol where still not finished. This resulted in a turn in what the goal of this project was, and a new goal where set. The goal where now to develop and construct a reciever and a transmitter and make a research of how well diffrent kind of protocol would perform.

Hydropower dams have been helping our society with electricity production for a long time now. In the past there have been several serious dam accidents in many parts of the world and the continuous work with dam safety is very important to Swedish hydropower industry. There are many measurements that must be recorded and analysed in order to guarantee safe operations and there are several ongoing digitisation projects that focus on that area of interest. This master thesis project was done in cooperation with Vattenfall R&amp;D and its main focus was measuring of the water level in open stand pipes with wireless sensors using LoRa radio technology. This aspect is important since this water level represents the uplift pressure that acts on gravity dams and how it varies over time. The goal of this thesis was to accumulate knowledge about wireless transmission from sensors and to analyse and evaluate the proposed, LoRa-based system. This goal was met by conducting a literature study about wireless transmission from sensors and different aspects of the LoRa-technology, performing practical test of the proposed system and finally by doing a risk analysis with focus on potential attack paths into the system. The study showed that even though LoRa is a quite new technology, it has matured fast enough to be of interest for dam safety monitoring applications and it also provides relatively high level of security in the most cases. There are unfortunately several methods of jamming or disrupting the system, which could be potentially used by a malicious entity. The motivation level for this kind of attack was deemed to be low since the data transferred is of no interest for a third party. Apart from such potential attacks, LoRa is a technology that is well suited for applications in the hydroelectric sector that do not require large transmission capacities because of its low energy usage and the ability to connect to several sensors placed at larger distances. Several minor problems were discovered during the practical tests that were conducted during this project but those were solved quickly in dialogue with the supplier, Iot AB and the manufacturer, Keller. The nature of those tests was quite improvised since a standardised test procedure for such innovative solutions is lacking. Nevertheless, those tests were concluded with satisfying results. The test installation of the system at the power plant was performed well and all parts of the system functioned as expected. The results pointed to the conclusion that the system was functioning correctly and there is a good potential for a wide implementation despite its potential security risks. Teknisk-naturvetenskapliga fakulteten, Uppsala universitet. Utgivningsort U ppsal a/Visby. H andledare: Christi an Bernstone, Äm nesgranskare: Urban Lundin, Exami nator: Petra Jönsson

Wireless transmission is an everyday part of movie production and a tool many people use in their work. Work, on a movie production, is fast, intense, and varies in geographical location almost on a daily basis (sometimes several locations in a day). Despite this, the stream, the transmission, must hold so the crew can work. This thesis explores the different impacts materials have on the transmission (using the Boxx Atom System as a test object). The materials were everyday occurrences such as walls (wood and stone), doors (steel, wood), windows (glass), and humans (the crew). The tests were done in the office of Video Assist Sweden in Stockholm, testing both quality and calculating the link margin. The results gave room for improvement but were interesting and sometimes surprising. Glass is best for a smooth transmission. Wooden doors and human beings’ impact were basically the same and stone and steel had the largest impact. In this thesis, we attempt to explain the results and draw conclusions from them and our own experiences in the field. / Trådlös överföring är en vardaglig del av en filmproduktion och ett verktyg som många använder i sitt arbete. Arbetet med en filmproduktion är snabbt, intensivt och varierar mellan olika platser nästan dagligen (ibland flera platser på en dag). Trots detta måste video transmissionen fungera så att hela teamet kan arbeta effektivt. Detta examensarbete undersöker de olika effekterna material har på transmissionen (med hjälp av Boxx Atom System som testobjekt). Materialen var vardagliga händelser som väggar (trä och sten), dörrar (stål, trä), fönster (glas) och människor (besättningen). Testerna gjordes på Video Assist Swedens kontor i Stockholm, där man testade både kvalitet och beräknade länk-marginalen. Resultaten gav utrymme för förbättringar men var intressanta och ibland överraskande. Glas är bäst för en smidig överföring. Träs och människors påverkan var i princip densamma och sten och stål hade störst påverkan. I detta examensarbete försöker vi förklara resultaten och dra slutsatser från dem och våra egna erfarenheter inom området.