<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.

Maxicap AB är ett företag som utvecklar och tillverkar elektronisk utrustning för bland annat olika mätuppgifter. Målet med detta examensjobb var att undersöka och implementera en stabil trådlös dataöverföringsmetod med den utrustning som Maxicap ville använda. Detta skulle åstadkommas/testas genom att sända temperatursensorvärden trådlöst med Nordic Semiconductor’ssändtagare (eng. transceiver) styrda av Atmel’s mikrokontrollers. Arbetet fokuserade på att få till denna stabila trådlösa överföring genom att implementera frekvenshoppning och datapaketskontroll på datatrafiken inom det fria 2,4 GHz ISM-bandet. All den C-kod som utvecklades i detta arbete är skriven för att vara lättanpassad till flera olika modeller av mikrokontrollers inom Atmel’s produktserie samt att kunna användas till andra liknande projekt. Koden är väldokumenterad med kommentarer vid varje funktionsblock som beskriver vad funktionerna gör och hur de skall användas. Arbetet resulterade i två fungerande prototyper. En enhet känner av temperaturen i luften och skickar sedan detta temperaturvärde trådlöst till enhet nummer två. Detta värde samt några inställningsvärden för mottagaren visas sedan på den enhetens display.