In this paper is analyzed the application of wireless technologies in Internet of Things (IoT) livestock monitoring systems. Initially are initialized the most important factors of the wireless technologies and characteristics of the wireless sensor networks, which limit their application. Next, are reviewed numerous applications of LoRa, ZigBee, WiFi, BLE, GPRS/3G/4G as well as other communication technologies. Their main areas of application, commonly used data sources, as well as the acceptable frequency and data volume of the sensor readings are evaluated. The results of this study provide the necessary information for designing a wide range of IoT systems, used for monitoring of indoor and outdoor bread animals, of the parameters of their environment and of different technological processes in livestock farms.

This work presents the results of an experimental study of the braking properties of bicycles and an e-bicycle. Data on braking decelerations and braking distance under different braking conditions were obtained for different bicycles including an e-bicycle. A satellite receiver was used to receive the data and specialized software was used for their processing. The specialized literature lacks data on the braking properties of bicycles for Bulgarian road conditions, which are necessary for any expert investigations of accidents involving cyclists. An initial database of bicycle braking decelerations for various braking conditions was compiled. The obtained results on the braking properties should be very useful in the preparation of auto-technical examinations for the court and the police, as well as for improvements in road traffic safety.

Remote labs have become an affordable technology in many aspects and as a result is now widely applicable in the universities. This article describes a lab for remote access to a combination of DC motor with DC generator. A fully interactive environment is offered for the remote user and the specialized architecture meets all network requirements in terms of security. Examples of usage of remote laboratories as a part of engineering education is presented. Furthermore, the study presents some results from the application of the developed lab in the Electrical Engineering course, toughed to students from the Mechanical and manufacturing engineering faculty, Agrarian and industrial faculty and Transport faculty.

INMATEH Agricultural Engineering is an open access international journal that publishes reviewed original research papers of both experimental and theoretical nature in the following areas: Technologies and technical equipment for agriculture and food industry, Environmental-friendly agriculture, Renewable energies, Technical equipment testing, Environment, Transport in agriculture, others

Temperature and humidity are the most important factors that must be controlled during egg incubation. The irrelevant temperature and humidity values during the incubation period often result in unwanted conditions. This paper introduces a design and implementation of an electronic control unit for an incubator. In order to achieve a high degree of hatching in the incubators, it is necessary to ensure precise maintenance of the parameters of the indoor microclimate. In this work, an electronic system for controlling the temperature and humidity of the air has been developed and investigated. For this purpose, a block diagram of the system has been developed, a basic electrical circuit of the electronic module has been built, and the individual blocks of the electronic system have been designed. Simulation and experimental results for the operation of the system have been obtained.