Design and Implementation of Temperature，Humidity and Light Intensity Automatic Control System for Greenhouse

For today′s development needs of Chinese agricultural facilities，a monitoring system for greenhouse in agriculture was designed.STC89C52 microcontroller was the core，DHT11 temperature and humidity sensor was the temperature and humidity acquisition unit，and AH2003 sensor was the light intensity acquisition unit，the system consisted of temperature and humidity testing，temperature and humidity control，illumination detection，illumination control，PC system，etc.The shed environmental monitoring and regulation were implemented.Test result showed that the greenhouse temperature，humidity，light intensity and illumination time were in line with the best plant growth conditions.