Fig. 1: Structure and working mechanism of the raindrop-powered autonomous rainfall monitoring and wireless transmission system (R-RMS).
From: Raindrop energy-powered autonomous wireless hyetometer based on liquid–solid contact electrification
a Framework for the R-RMS. b Structural design of the fabricated R-TENG. c SEM image of the treated PTFE surface and raindrop contact angle. d Working principle of the R-TENG unit
