Deep Sleep Mode Based NodeMCU-Enabled Humidity Sensor Nodes Monitoring for Low-Power IoT

Abstract

In this paper, we provided an efficient way to reduce the power consumption of sensor nodes in an IoT ecosystem. In many cases, IoT objects are battery powered and need to be energy efficient as the most important requirement in order to have a stable operation over long periods of time. The deep sleep mode is used for low power monitoring of NodeMCU. Commercial humidity sensors normally sleep and wake up once an hour to measure soil humidity. The measured humidity data was transmitted wirelessly to Google Sheets via a NodeMCU Wi-Fi module. The user can check the humidity of the soil by referring to the transmitted data values. The power consumption was reduced by about 83% for 1 h than compared to the always awake mode.