Fig. 4: Application for autonomous and sustainable rainfall monitoring and wireless data transmission.
From: Raindrop energy-powered autonomous wireless hyetometer based on liquid–solid contact electrification
a Outdoor application prospect sketch of the R-RMS. b Demonstration of the R-RMS in a simulated rainy environment. c Optical images of the R-TENG, EMM, and MCU and wireless module. d The voltage variation of the capacitor connected with the EMM for several consequent transmitting cycles. e Rainfall data acquired by the wireless receiving terminal
