Self-sustainable power-collecting node in IoT

Abstract This article details the energy analysis of a sustainable node in time (NodeMCU), using a solar energy collection system with NiMh backup batteries during the night, rainy days, and low solar brightness days. The solar power collection system was characterized by extracting data from Sunny, Cloudy, and Rainy days from the AccuWeather weather information system, as the Colombian Institute of Hydrology, Meteorology and Environmental Studies only provides monthly information. The system was implemented using a very low-speed TDMA data transmission scheme, which used 8 GET HTTP requests to transmit the following information: The first field is the input voltage of the node power regulator, and the remaining fields the value is zero, filling a complete time slot. This information was transmitted to the ThingSpeak platform, which registered the behavior of the solar power collection system over a period six months, monitoring the stability, autonomy, and sustainability of the node.