| Abstract [eng] |
The measurement of room temperature is necessary seeking to control heating and ventilation in the room. For this purpose a sensory processor was created. It measures temperature by means of radio signal and sends the measurements to the device collecting data. Algorithms and devices for measuring temperature and transmitting data by radio signal were discussed in this work. Data are transmitted by radio contact frequency – 433 MHz. In order to get the simplicity of the system and a lower degree of energy use, a sensory processor can only send data, therefore there is no possibility to synchronize transmitters with each other and with the receiving device. Seeking to use several devices, data are encoded with the method of spread spectrum. This method allows to emit signal of one transmitter from the general radio signal which includes signals of several transmitters and the noise. Wireless transmitter of temperature measurement system was created in the course of this work. The algorithm of data transmitter works in chosen architecture and uses a small amount of energy. It prolongs the length of work of sensory processor power supply. The analysis of devices measuring temperature and their algorithms is presented in the work. The ways of data transmission by wireless systems is discussed. Taking into consideration optimal energy use, mathematic model for measuring and sending temperature has been made. During experimental researches energy use dependencies from algorithm of system management and modulation length of sequences has been determined as well as data transmission distance dependence on the length of sequences. |
