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Monitoring and recording system of laboratory environmental conditions as ISO/IEC 17025 requirement

ISO/IEC 17025, general requirements for the competence of testing and calibration laboratories, requires the control, monitoring, and recording of laboratory environmental conditions. For a ventilated environment with a simple air conditioner, it is necessary to take measurements from various points to show that a homogeneous temperature and humidity distribution exists. The sensor nodes having the capability of measuring temperature and humidity can be a solution for such a laboratory environment. In this study, an IoT-based monitoring system designed and applied for tracking temperature and humidity in the laboratory ventilated with a simple air conditioner is presented in accordance with ISO/IEC 17025 standards. The system consists of three layers including the slave nodes which sleep under normal conditions but send the temperature and humidity values to the receiver module when they are awakened, the master module that collects data from the sensor nodes and the internal sensor, saves them to SD memory, display current data on a LCD screen and sends average temperature and humidity values to the cloud environment and the IoT-cloud storage platform where data is stored and followed by laboratory workers and laboratory service users.