Ing. Tomáš Teplý

This paper deals with an overview of mechanical-electrical systems used in generating electrical energy for the purpose of powering secondary systems controlling access control systems. In practice, we can meet them, for example, in administrative buildings, where they serve as sources of electricity for autonomous systems for the authorization of workers in the house. GaN transistors are also beginning to be used in this area and their use leads to higher energy gains

A large number of IoT nodes creates a danger of extra expenditures when changing the battery. For this reason, the development of supply nodes tends to prefer systems capable of battery-less operation, obtaining energy from other sources. This article deals with an alternative method of electrical energy acquisition form the excessive heat appearing in LED lighting fixtures utilizing large-area LED chips. A Peltier cell was used for the conversion of heat energy to electrical energy, connected as thermo-electric generator into the thermal chain.

This paper demonstrates the concept of node consumption reduction for IoT applications. The main emphasis is placed on the autonomy of the whole device, which must be independent of external power supply. That is why energy harvesting based on temperature principle is used for power supply. One of the parameters monitored is the service uptime. The concept of intelligent control of the individual parts of the equipment leads to significant energy savings. This control requires the use of low power components, but only their appropriate connection and mutual monitoring of their operating modes leads to the desired savings. This algorithm can be adapted to the needs of IoT nodes focused on real-time performance applications or the process tracking slow low power applications. This concept will ultimately be adapted to a wireless node for monitoring position and temperature for use in medical applications to monitor the patient's position on the bed or position while moving.

The development of IoT instrumentation will always be strongly influenced by the properties of the power supply system. A large number of IoT nodes creates a danger of extra expenditures when changing the battery. For this reason, the development of supply nodes tends to prefer systems capable of battery-less operation, obtaining energy from other sources. This article deals with an alternative method of electrical energy acquisition form the excessive heat appearing in LED lighting fixtures utilizing large-area LED chips. A Peltier cell was used for the conversion of heat energy to electrical energy, connected as thermo-electric generator into the thermal chain.

This paper discusses the concept, design and testing of a IoT based monitoring system for the needs of farmers. The system consists of integrated autonomous BLE beacons, which are located on the monitored objects (in our model case it is cattle). These beacons transmit their identification data in specified periods together with other additional information, which then serves to perform accurate targeting of the monitored object in the monitored area (meadow, fence). This data is periodically received by a central hub, which brings this information together, eliminates duplications and sends the final datagram containing information about active beacons via the GSM network (or LoRa) to a central server, where the data is subsequently processed. A pilot test experiment is taking place this summer on a private farm in Central Bohemia.

This paper discusses the concept, design and testing monitoring system for the needs of farmers. The system consists of integrated autonomous BLE beacons, which are located on monitored objects (in our model case, cattle). These beacons transmit their identification data in specified periods together with other additional information, which is then used to perform the precise targeting of the monitored object in the monitored area (meadow, grazing, fence).

Článek se zabývá návrhem a testováním monitorovacího systému pro potřeby farmářů. Systém sestává z integrovaných autonomních BLE beacon, které jsou umístěny na sledovaných objektech (v našem modelovém případě se jedná o skot). Tyto beacony vysílají v určených periodách svoje identifikační údaje společně s dalšími doplňkovými informacemi, které následně slouží pro provedení přesného zaměření sledovaného objektu ve sledovaném prostoru (louka, pastva, ohradník). This paper discusses the concept, design and testing monitoring system for the needs of farmers. The system consists of integrated autonomous BLE beacons, which are located on monitored objects (in our model case, cattle). These beacons transmit their identification data in specified periods together with other additional information, which is then used to perform the precise targeting of the monitored object in the monitored area (meadow, grazing, fence).

During infectious diseases outbreaks, the centers for disease control need to monitor particular areas. Considerable effort has been invested into the development of portable, user-friendly and cost-effective systems for point-of-care (POC) diagnostics which could also create an internet of things (IoT) for healthcare via globe network. However, at present IoT based on a functional POC instrument is not available. Here we show fast, user-friendly, and affordable IoT system based on a miniaturized polymerase chain reaction device. We demonstrated the system’s capability by amplification of either complementary deoxyribonucleic acid (cDNA) or ribonucleic acid (RNA) of the dengue fever virus (DENV). The result data were then automatically uploaded via a Bluetooth interface to an Android-based smartphone and further wirelessly sent to global network, instantly making the test results available anywhere in the world. The IoT system presented here could become an essential tool for healthcare centers to tackle infectious disease outbreaks identified either by DNA or RNA. Its use can be of side scope, since it can be modified to be compatible with other sensing methods.

This is a relatively large area of security systems with the task of monitoring the movement of people and goods, event. and other entities, such as mobile technology. The systems are designed to protect against penetration by unauthorized entities, control of movement within the system and, of course, protection against information leakage and data.

Is a relatively new method of identification of RFID in the UHF band. It is used mainly in industrial applications, logistics, warehouse management, building management, etc. In general, wherever there is a need for a large distance, typically drive up to tens of meters, identify objects. Sensors for UHF RFID work in the bands 865-956 MHz (exceptionally 2.4 GHz), and some allow you to connect external antennas (dual polarization) and have a wide range of communication interface (Wiegand, RS-485 232, Ethernet).

It is a concept used in larger systems, is composed of large number of access points, controllers, and control workstation (PC). The most commonly used bus or star topology, with a central element in the form of exchange (main control unit) or PC, which is used for the verification of access rights, time filter, etc. In the case of bus topology, all access points connected by bus (most RS-485) and connected to the control panel or via the access system bus interface directly to a PC. Star topology represents the interconnection of access points wired Ethernet network.

Electromechanical and electromotive locks and openers may be the state in which they are in the voltage, divided into two versions. Common (called fail-safe, energized are released after disconnecting power supply is blocked). Reverse (so-called fail-safe, energized blocked, disconnecting power is released)

This paper describes a field of Access Control System Applications and its configuration

The main target of this paper is the software implementation of a radio frequency identification (RFID) access control system. It should be used for RFID readers, communication between readers and central device, with focus on a fast and safe data transfer, information database and real time data analysis. The readers have to work standalone, independently of the central device, with minimum power consumption. Optionally, the system should permit to connect additional sensors.

Článek se zabývá popisem MEMS mikrovlnných přepínač, jejich konstrukce a oblastmi použití. Dále je proveden výběr vhodného MEMS přepínače pro přepínání mikrovlnného signálu, do kmitočtu 1600 MHz.

Článek se zabývá charakterizací MEMS mikrovlnných přepínačů a porovnáním jejich vlastností s PIN diodovými a FET přepínači.Dále je proveden výběr vhodného MEMS přepínače pro přepínání mikrovlnného signálu, do kmitočtu 1600 MHz, mezi čtyřmi větvemi.

The article describes the way how to improve the efficiency of the power stage of the RF amplifier operating in the class A, using the adaptive bias technique. Power stage is designed to operate at the frequency of 100 MHz and the maximal wattage of 2W at supply voltage of 20V. The output of the amplifier is adjusted for load of 50Ω and the voltage gain is 18. Designed circuit exhibits very good linearity and the power dissipation can be reduced down to 30 per cent compared to normal power stage in class A.

The article describes the primery technology of production polymers devices.