-Application scenarios of WSN implementations are really broad. Due to their typical characteristics, such advantageous power consumption, wide communication coverage and relatively broad sensing possibilities, many application fields can be covered. In this paper, the problematic of power metering is targeted. Places with shared power sources, where electricity usage is calculated equally according to the number of users, are often misused by single users for illegitimate power usage. Special WSN was developed and implemented in a scenario of multi-store parking garage to solve this problem.

Abstract-This paper addresses analysis of the principle of a bi-directional electric energy charge pump and describes circuit solution for control unit of a wireless sensor node power subsystem. This power and control unit, as the power subsystem of the wireless node, comprises two supercapacitors. Bi-directional energy flow between these two supercapacitors takes place in order to optimally satisfy the sensor node energy requirements. At the same time, the bi-directional energy flow enables optimal energy harvesting from the selected energy scavenging (harvesting) subsystem. The mentioned Power Unit Control System has been successfully verified in the process of energy harvesting from a solar module.

Summary In this paper, the problematic of power metering is targeted. Places with shared power sources, where electricity usage is calculated equally according to the number of users, are often misused by single users for illegitimate power usage. Special wireless sensor network was developed and implemented in a scenario of multi‐store parking garage to solve this problem. This paper is an extended version of the paper published in the iNetSApp'15 section of the FedCSIS 2015 IEEE international conference. This paper is supplemented with measured waveforms of mains magnitudes for concrete electrical appliances (bulb, refrigerator, and electric motor). Copyright © 2017 John Wiley & Sons, Ltd.

Data acquisition and processing are well known for some time. Many applications use powerful hardware to acquire, process, and visualize signal waveforms. But there are some applications that do not have to perform high resolution signal acquisition and process large amount of data, for example, low frequency applications of embedded design and applications for remote power grid monitoring. The paper describes special system for low frequency signal data sample acquisition, processing, and visualization implemented as a service on Android-based smart device. The service makes smart device functioning as an oscilloscope or arbitrary waveform generator which is accessible remotely through Bluetooth. The design respects low power consumption requirements, simplicity, and user friendliness in application design. Application scenario was implemented as wireless data acquisition system for power grid monitoring.

Abstract-In this paper, we propose voltage converter with high efficiency over wide input voltage. This converter is suitable for the solar panel for WSN applications where the only power source is a solar cell that outputs highly variable voltage. The aim is to achieve this by using multiple converter topologies in parallel. Use of such converter has a meaning in renewable resources that in the long term operation significantly change their output voltage. The efficiency of particular topologies is estimated in simplified loss model, which is later experimentally tested.