Design of Ultra-Low-Energy Temperature and Humidity Sensor Based on nRF24 Wireless Technology
Branko Babušiak, Maroš Šmondrk, Štefan Borik · 2019
The proposed article introduces a low-cost and ultra-low-energy wireless sensor design that forms part of a wireless network consisting of one central node and several peripheral sensor nodes. The nRF24L01+ transceiver modules operating in unlicensed 2.4 GHz band are used as a wireless technology. The main effort is focused on the optimal selection of wireless communication parameters to ensure reliability and data transmission range between central and sensor nodes. In addition, a design and implementation of wireless sensor node to monitor humidity and temperature environmental data is discussed. A conducted series of experiments to assess the power efficiency and communication reliability have shown that the proposed wireless sensor network is suitable for Smart Home applications. Developed sensor node's transmission power is approx. 3.5 mA, operating up to 225 days in standby mode while driving a single coin battery.