Trådlös trygghetslarm för en Androidenhet
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
If an elderly people fall they can get injured and lose their ability to get help. This is a major health problem in the society today which generates great expenses and suffering.Today smart phones are both cheap and are used by more and more people. These phones have the ability to get the users current location and communicate with other devices. In this thesis a smart phone has been used as an alarm. If the alarm is triggered the application starts an alarm sound and gets the user's position. This position is then converted to an address and sent to an ''in case of emergency'' number.The alarm application solves the problem how to contact the surroundings but the most optimal way is not to have the phone in your hands all the time. With a wireless sensor the phone can be use independently and a sensor can be made smaller which make it easier to attach and won't interfere with the user as much as a phone.A sensor unit that can communicate with the smart phone through Bluetooth has been developed. This unit is supposed to classify the user's motion pattern, via an accelerometer, and start the alarm in the phone when an certain motion is detected, such as a fall. An algorithm that can classify falls and motion patterns from the accelerometer was developed. The developed algorithm did work satisfying when tests were preformed with the sensor unit. The algorithm was however only developed and tested in MATLAB since this made it easier to evaluate the result. Due to time restrictions the algorithm was never implemented on the sensor and if the sensor is supposed to work with the alarm application as expected this must be done.The developed device has the ability to do all the required calculations and is able to pair and send all needed data to a smart phone. The device is however not made for production since the size and price of the components have not been optimized.
Place, publisher, year, edition, pages
2012. , 76 p.
IdentifiersURN: urn:nbn:se:ltu:diva-42420Local ID: 06f7de3e-67d1-4f81-aa0a-75f6e891af47OAI: oai:DiVA.org:ltu-42420DiVA: diva2:1015641
Subject / course
Student thesis, at least 30 credits
Engineering Physics and Electrical Engineering, master's level
Validerat; 20120813 (anonymous)2016-10-042016-10-04Bibliographically approved