This report deals with the development of a wireless sensor system that measures the environmental energy and predicts if energy harvesting could be possible in different areas. It provides an overview over the hardware used to build this system and gives a detailed description of the software implementation of the system. The hardware part presents the microcontroller and platform that is used, as well as the sensors integrated in the system. The software part explains how the used hardware was put together in a program that controls the different components. It explains the possibility to save captured sensor values on an SD card or send them to a remote receiver with an XBee radio module in real time. Also the inclusion of the mbed software library, which provides a lot of useful applications and functions for the project, is an important part. The final part of the report presents the results, showing how the system works.

This Master’s thesis deals with assembling of a colorimeter using NFC technology. The theoretical part introduces the principles of colorimetric measurement, calibration curve, and important physical quantities. Further, the principle of NFC technology, its architecture, and division of NFC devices are described. The goal of the practical part is to propose a structural design and software solution of a colorimeter. Particular emphasis is placed on the selection of the RGB sensor that is being tested and its results are being analyzed. The construction of electrical circuit and microprocessor control are being solved. The manuscript deals with the implementation of an application for the Android operating system, which serves as the user interface of the colorimeter. Obtaining data from the sensor and storing it in a memory of the NFC tag is provided by the Arduino platform. Issues that were encountered during the work are analyzed in the discussion.