Real Time Analysis of Biphasic Temperature Pattern of BBT Using NiMn2O4 Nanocomposite Thermistor

There is a significant interest in the analysis of biphasic temperature pattern for natural family planning (NFP). In this paper, we report an IoT enabled Basal Body Temperature (BBT) monitoring system-designed and developed using a NiMn2O4 nanocomposite powder based thermistor. BBT is the lowest body temperature attained at rest and normally ranges from 308.70 to 310.65 K. The pelletized active material NiMn2O4 was placed in a thermally conductive Teflon tube with Aluminum (Al) metal contacts on either side as electrical contacts to the active material. Resistance of the Al/NiMn2O4/Al composite structure is inversely proportional to temperature changes. A resistance change of 953000 500 to 591000 450 was observed for a change of basal body temperature from 304.65 to 313.15 K with a correlation coefficient (R2) of 0.9628. Real time monitoring of BBT was facilitated by Node MCU and ThingSpeak IoT platform for predicting the ovulation pattern in women.