Safety production based LED light system design for plant factories

Plant factory is a kind of efficient agriculture system, through high-precision computer control system, it brings plants suitable temperature, humidity, illumination and concentrations of carbon dioxide. LED light system based on red and blue light has already been applied into plant factory, aiming at providing suitable illumination for plants. To avoid the harm of blue ray to human eyes and skin, we provides a kind of light system for plant factory based on LED with blue, red and green light. The system adopts STM32 as the main control chip, and uses the PWM technology to regulate the LED light intensity. The system has two modes, manual operation mode and plant growth mode, it can switch its working mode automatically. The key difference between these two modes is the existence of blue ray. Since blue ray does harm to human eyes and skin, when people expose to the working environment, the system will turn to manual operation mode which weakens blue ray. At other times, system will go on the plant growth mode. The system can also detect the environmental parameters and adjust the required illumination parameters to fit plant growth in different life cycle. Furthermore, ZIGBEE technique has been used as network connection solution for large plant factory. From the experiments we have conducted, our system achieved satisfying performance, it realizes safety production of the LED light system for plant factory.