Study of metrological characteristics of low-cost digital temperature sensors for greenhouse conditions

Abstract

The article focuses on the relevant scientific and applied problem of assessing and analyzing the metrological characteristics of available digital temperature sensors for greenhouse conditions. The hardware and software implementation of the microprocessor system for obtaining calibration characteristics and evaluating the accuracy and performance of temperature sensors for the physical media under greenhouse conditions is studied. A particular type of linear calibration equation for the temperature sensors under study is established. The values of systematic absolute measurement deviations of temperature sensors DS18B20, SHT11, SHT21, BMP180, BME280 and DHT22 are experimentally obtained. Recommendations on improving the accuracy of temperature information and temperature measuring systems under greenhouse conditions are given. The perspective areas of the research on metrological provision of modern means of automatic monitoring and temperature control in industrial greenhouses are substantiated.

Computer-Integrated Device for Acidity Measurement Monitoring in Greenhouse Conditions with Compensation of Destabilizing Factors

“…The articles Liu et al [31] and Vovna et al [32] substantiate the main scientific and practical approaches to assessing metrological characteristics of non-destructive testing using the concept of uncertainty and the error theory. Laktionov et al [10,33] and Dar et al [34] developed the main provisions for planning experimental tests of computerized means for monitoring the greenhouse microclimate.…”

“…The adapted method for assessing the quantitative accuracy parameters of the developed measuring system [37][38][39] is presented in the form of a block diagram of the algorithm in Figure 4, where: Uouti,j-the results of j observations of the sensor output voltages in each of the i series, V; Nthe number of observations in each series; The estimation of the components (random and nonexcluded systematic residues) of the total uncertainty of the acidity measurement was performed by using the measurement technique with multiple observations. As a result, a sample of experimental data is accumulated, followed by averaging on the basis of the normal law of distribution of random variables [32,39].…”

Mathematical Model of Measuring Monitoring and Temperature Control of Growing Vegetables in Greenhouses

“…the basic approaches to the implementation of simulation models of fuzzy control of temperature modes of cultivation on the basis of differential equations of heat and mass transfer are presented. In articles [14][15][16] basic scientific and theoretical provisions concerning physical, mathematical and simulation modelling of industrial greenhouse microclimate with the use of modern hardware and software solutions to the construction of computerized systems of monitoring and control of technological modes of crop cultivation on the protected grounds are presented. The results of the development of dynamic models of influence of microclimate parameters on the quality of growing vegetable crops under greenhouse conditions are presented in articles [17][18][19], as well as the main algorithms and results of numerical solution of the proposed models.…”

“…The results of the calculations prove the need to take into account the effect of condensation during the mathematical modelling of the process of temperature monitoring of the greenhouse growing zone. Therefore, the total amount of the heat energy lost in the greenhouse due to the effects of soil thermal conductivity, soil absorption capacity, ventilation, infiltration and condensation can be estimated by formula (9) based on the results of calculations by formulas ( 10) - (16). While modelling the process of heat energy losses from the greenhouse, the regulated requirements for the engineering design of greenhouses, the temperature-humidity modes of growing greenhouse crops and the seasonality factor were taken into account.…”

Аналіз Систем Терморегулювання Та Способів Вимірювання Температури

“…Загальні питання розвитку методів вимірювання температурного розподілу розглянуто в [4], дослідження метрологічних характеристик вимірювачів наведено в [6], дослідження метрологічних характеристик цифрових датчиків температури досліджено в роботі [8]. Питання дослідження метрологічних характеристик мікропроцесорних вимірювачів у спеціалізованих вимірювальних системах розглянуто в роботі [9].…”