Verification Device for Temperature and Relative Humidity Inside the Infant Incubator via IoT

Abstract

This research aims to design a prototype for verification of the temperature and relative humidity inside the infant incubator and to improve the accuracy of the sensor, as well as allowing the prototype to monitor temperature and relative humidity via IoT for teaching in medical instrumentation calibration topic. The designed device composed of 3 main parts: 1) Input consists of 5 DS18B20 temperature sensors and 1 DHT22 humidity sensor, 2) The processor part used NodeMCU (ESP8266) board which programming with Arduino IDE and 3) The display was divided into two parts: IoT and data logger to save data into external memory before published data to thingspeak.com. The designed device was set in the water bath together with OM-CP Data Logger tested on 5 to 40° C to find temperature error for each sensor at each temperature value. The prototype was reprogrammed with compensation the error equations of each sensor in the program and then retest with the infant incubator temperature 32- 40°C. The result found that the error values were highly decreased. Performance testing of the designed device in the infant incubator was compared to the Incubator Analyzer Brand Fluke Biomedical INCU II based on IEC 60601-2-19 test on 32° C and 36° C. The pattern of the temperature changes inside infant incubator of the prototype device compared with the standard device was closely same for both temperatures. The average temperatures and relative humidity measured from the prototype device on Steady Temperature Condition (STC) were had approximate acceptable values compared to mean values obtained from the standard instrument. All temperatures reading from the prototype were different from the standard device temperature less than 0.5°C, and the relative humidity reading from the prototype was different from relative humidity reading from the standard device of less than 5 %.