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Wireless Mediahandler
2011 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The goal is to create a self sufficient system that can send audio data to a phone or other device. There has been a few setbacks during the project which removed streaming with A2DP, HSP or HFP as a transfer option. There is a solution using OBEX and OPP to push files to the phones that works in the preliminary testing. The Mulle is a low power EIS platform which can be used for a variety of purposes. Version 3.1 is used for this project and contains a Bluetooth module, which enables communication with phones and other Bluetooth devices. There is also an internal temperature sensor and a variety of I/O pins available using a connector. This makes the Mulle a suitable base platform for this project. The internal memory of the Mulle isn't large enough to contain the file so an external flash card is required. It was decided to use a µSD card for this since its easy to connect to a microcontroller using the SPI interface and is commonly available at low prices. The user interface is kept to a minimum by actively scanning for devices and sending the file to the users that appear within range. There are some programmable pushbuttons and LEDs for debugging and future development. Programming can be made directly using USB or the E8 header, which also charges the batteries. To maximize the power outtake from the solar cell a MPPT (Maximum Power Point Tracker) will be used to provide the optimal load for the solar cell. This can be actively controlled from the Mulle to compensate for deviations due to manufacturing and temperature. Current and voltage measurements are required for the control algorithm and are acquired using two ADCs.

Place, publisher, year, edition, pages
2011. , 74 p.
Keyword [en]
Keyword [sv]
URN: urn:nbn:se:ltu:diva-59063Local ID: f97e96bc-cbbd-4303-9e14-58814cfc50f4OAI: diva2:1032451
Subject / course
Student thesis, at least 30 credits
Educational program
Electrical Engineering, master's level
Validerat; 20110524 (anonymous)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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Qvarnström, Rikard

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