“Green Field Light Convergence”—STM32-Based Photovoltaic-Microalgae Sewage Treatment System

Aiming at the problems of difficult rural sewage treatment and high energy consumption and high cost of traditional methods, this project proposes a decentralized sewage treatment solution with zero power consumption and easy deployment—light-controlled aeration energy-saving solution, which takes STM32F103C8T6 as the main control core and innovatively integrates photovoltaic power generation with microalgae ecological technology. Powered by photovoltaics, the STM32F103C8T6 coordinately controls the sensing, temperature control, light regulation, aeration, and display modules to provide a favorable environment of temperature, light, and oxygen for the microalgae reactor respectively. This ensures that microalgae are in the optimal metabolic conditions, greatly improving the efficiency of sewage treatment. The solution effectively addresses the pollution problems caused by breeding black wastewater and rural domestic septic tanks, and improves the living environment. Meanwhile, the microalgae by-products can be recycled to nourish farmland, contributing to green development.