A Sustainable Temperature Monitoring System Powered by Solar Cells and Supercapacitors

This study presents the design and implementation of a sustainable temperature monitoring system powered by solar energy and supercapacitors. The system incorporates a SCMS22F255PRBA0 supercapacitor (5.5V, 2.5F) and the BQ25570 integrated circuit from Texas Instruments, which enables efficient storage of energy harvested from a lead halide perovskite (LHP) solar cell. The solar cell supplies power to the BQ25570 circuit, which not only stores the energy in the supercapacitor but also regulates a stable 3.3V output to power an STM32 microcontroller. The microcontroller, operating in low-power mode, is responsible for measuring ambient temperature and logging the data in its memory. The system is designed to operate continuously, even under low-light conditions, by using the combination of solar cells and supercapacitors. This configuration ensures that the system remains functional in off-grid or remote locations where conventional power sources may be limited or unavailable. The presented work highlights the potential of integrating renewable energy sources with energy-efficient embedded systems for real-time environmental monitoring, offering a viable solution for applications in areas with constrained power resources.