Design of Greenhouse Temperature and Humidity Monitoring System Based on 51 Single Chip Microcomputer

Aiming at important influence of greenhouse temperature and humidity on safe production of vegetables，a hardware，software design and system test of greenhouse temperature and humidity monitoring system based on 51 single chip microcomputer was proposed.Temperature and humidity monitoring system used STC89C52 single-chip microcomputer to process data collected by the temperature and humidity sensor in real time，and used optocoupler temperature and humidity relay to control temperature and humidity in the greenhouse.Current information of temperature and humidity could be accurately displayed on 1602 LCD screen，and could accept mobile phone terminal.The instructions sent to complete exchange of information with mobile phone.Automatic monitoring and control of temperature and humidity has been realized，which has effectively improved automation management level of greenhouse monitoring.