Sökning: "battery operated"

Visar resultat 21 - 25 av 43 uppsatser innehållade orden battery operated.

1. 21. Wireless control of wall switches : A module that controls your existing wall switch with an application

   M1-uppsats, Högskolan i Halmstad/Akademin för informationsteknologi

   Författare :Johan Örjegård; [2017]
   Nyckelord :BLE; Trådlös; litiumjonbatteri; servo; hemautomation;

   Sammanfattning : In this project a home-automation-solution is developed that wirelessly can control an existing wall switch with an application from a smart device. The purpose of the project is to develop a new solution that doesn’t require any electrical knowledge to mount the solution. LÄS MER

3. 22. Low-Power Policies Based on DVFS for the MUSEIC v2 System-on-Chip

   Master-uppsats, KTH/Skolan för informations- och kommunikationsteknik (ICT)

   Författare :Siva Sai Reddy Mallangi; [2017]
   Nyckelord :Multi functional health monitoring wearable devices are quite prominent these days. Usually these devices are battery-operated and consequently are limited by their battery life from few hours to a few weeks depending on the application . Of late; it was realized that these devices; which are currently being operated at fixed voltage and frequency; are capable of operating at multiple voltages and frequencies. By switching these voltages and frequencies to lower values based upon power requirements; these devices can achieve tremendous benefits in the form of energy savings. Dynamic Voltage and Frequency Scaling DVFS techniques have proven to be handy in this situation for an efficient trade-off between energy and timely behavior. Within imec; wearable devices make use of the indigenously developed MUSEIC v2 Multi Sensor Integrated circuit - version 2.0 . This system is optimized for efficient and accurate collection; processing; and transfer of data from multiple health sensors. MUSEIC v2 has limited means in controlling the voltage and frequency dynamically. In this thesis we explore how traditional DVFS techniques can be applied to the MUSEIC v2. Experiments were conducted to find out the optimum power modes to efficiently operate and also to scale up-down the supply voltage and frequency. Considering the overhead caused when switching voltage and frequency; transition analysis was also done. Real-time and non real-time benchmarks were implemented based on these techniques and their performance results were obtained and analyzed. In this process; several state of the art scheduling algorithms and scaling techniques were reviewed in identifying a suitable technique. Using our proposed scaling technique implementation; we have achieved 86.95% power reduction in average; in contrast to the conventional way of the MUSEIC v2 chip’s processor operating at a fixed voltage and frequency. Techniques that include light sleep and deep sleep mode were also studied and implemented; which tested the system’s capability in accommodating Dynamic Power Management DPM techniques that can achieve greater benefits. A novel approach for implementing the deep sleep mechanism was also proposed and found that it can obtain up to 71.54% power savings; when compared to a traditional way of executing deep sleep mode. Keywords - low-power; DVFS; DPM; energy; wearable devices; voltage and frequency scal- ing; låg effekt; DVFS; DPM; energi; bärbara enheter; spänning och frekvensskalning;

   Sammanfattning : Multi functional health monitoring wearable devices are quite prominent these days. Usually these devices are battery-operated and consequently are limited by their battery life (from few hours to a few weeks depending on the application). LÄS MER

4. 23. Environmental adjustments of the mobile preschools in Uppsala

   Kandidat-uppsats, Uppsala universitet/Institutionen för teknikvetenskaper

   Författare :Anna Jernlund; Niklas Pedersen; [2017]
   Nyckelord :mobile preschool; uppsala; diesel generator;

   Sammanfattning : The mobile preschools of Uppsala are buses that are provided as a complement for stationary preschools. The buses are connected to one stationary preschool that provides the necessities such as food and a place for the children to be before and after the daily trips. LÄS MER

5. 24. Design of a hybrid power PV – Genset – Battery storage system for a remote off-grid application in Malaysia

   Master-uppsats, KTH/Kraft- och värmeteknologi

   Författare :Pierre-Francois Marty; [2016]
   Nyckelord :;

   Sammanfattning : The thesis project presented in this report focuses on an analysis of the electrification prospects for a remote village in the Malaysian state of Sabah, where a micro grid is planned to be built. The main goal is to define the best sizing for a hybrid power plant to serve the micro grid, coupling a solar PV array with a storage system and a diesel genset. LÄS MER

7. 25. Efficient IPv6 Neighbor Discovery in Wireless Environment

   Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

   Författare :Dragos Neagoe; Antonios Pateas; [2016]
   Nyckelord :IPv6; Neighbor Discovery; 6LoWPAN; RFC 4861; Technology and Engineering;

   Sammanfattning : As the address space of IPv4 is being depleted with the development of IoT (Internet Of Things), there is an increasing need for permanent transition to the IPv6 protocol as soon as possible. Nowadays, many 3GPP (3rd Generation Partnership Project) Networks have implemented or will implement IPv6 in the near future for Internet access. LÄS MER