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Hardware optimizations and solutions for wireless low power kinetic energy applications
KTH, School of Computer Science and Communication (CSC).
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Hårdvarulösningar och optimeringar för trådlösa lågenergienheter vid användning av energiskördning (Swedish)
Abstract [en]

The number of IoT (Internet of Things) devices available on the market has been growing rapidly in the past few years and is expected to grow even more in the years to come. These IoT devices are predominantly in the form of very small wireless peripherals with low power consumption making them suitable for running over extended periods of time using only coin cell batteries. In this degree project, conducted at Shortcut Labs AB, we investigate whether or not some of these devises could be suitable for being powered exclusively by kinetic energy without the need for any long term interim power storage, such as batteries or super capacitors. If this is possible it would not only remove the hassle of having to replace batteries at regular intervals, which is important if the devices are positioned at remote locations, but it could also help to reduce the amount of battery waste in the long run. For the sake of this project we have designed a hardware circuit that is able to communicate with other devices using a custom built protocol running on top of the Bluetooth Low Energy standard. This circuit does not require a battery and could potentially be used for many years without the need for any maintenance. To demonstrate this, the technology has successfully been applied to a concept product in the form of a dimmer wheel that can be used to change the brightness or color of Smart Home light bulbs. This is achieved by using a small electric motor as a generator in combination with an energy harvesting circuit in order to generate a stable voltage suitable for use with a wireless module.

Abstract [sv]

Antalet uppkopplade IoT-enheter har ökat drastiskt de senaste åren och väntas fortsätta öka framöver. IoT, eller Sakernas Internet som det kallas på svenska, består övervägande av små trådlösa enheter med så pass låg strömförbrukning att de ofta kan drivas enbart av knappcellsbatterier. I detta examensarbete, utfört på Shortcut Labs AB, undersöker vi huruvida några av dessa enheter med fördel skulle kunna drivas uteslutande av rörelseenergi utan att kräva någon form av långtidsmellanlalgring av denna energi, så som exempelvis i ett batteri eller en kondensator. Om detta var möjligt så skulle det innebära att man slipper byta batterier vid jämna mellanrum, vilket kan vara viktigt om enheten i fråga är otillgänglig placerat. Givetvis kan också onödigt batteriavfall undvikas, något som alltid är eftertraktat i branschen. I detta projekt så har vi designat och konstruerat en elektronikkrets som trådlöst kan kommunicera med andra enheter via ett skräddarsytt protokoll som är implementerat ovanpå Bluetooth Low Energstandarden. Denna krets kräver inget batteri och skulle potentiellt sett kunna operera under många år utan behov av underhåll. För att demonstrera detta så har tekniken applicerats på en konceptprodukt i form av en dimmer som kan användas för att ändra antingen ljusstyrkan eller färgen hos så kallade smarta lampor. Detta uppnås genom att använda en liten DC-motor kombinerad med en energiskördande krets som genererar en lämplig stabil spänning, vilket krävs för att kretsen skall kunna operera.

Place, publisher, year, edition, pages
2017.
Keywords [en]
Energy harvesting, Wireless peripherals, Kinetic energy, Bluetooth, Low power, Smart Home, IoT
National Category
Computer Sciences
Identifiers
URN: urn:nbn:se:kth:diva-214939OAI: oai:DiVA.org:kth-214939DiVA, id: diva2:1144240
External cooperation
Shortcut Labs AB
Educational program
Master of Science in Engineering - Computer Science and Technology
Supervisors
Examiners
Available from: 2017-10-19 Created: 2017-09-25 Last updated: 2018-01-13Bibliographically approved

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