The temperature and humidity sensor used in agricultural greenhouses belongs to the sensing layer of the Internet of Things architecture. In agricultural greenhouse, the architecture of Internet of Things can be divided into three layers: perception layer, transport layer and application layer. The sensing layer uses various sensors, such as temperature and humidity sensor, light sensor, carbon dioxide sensor, wind direction sensor, wind speed sensor, rainfall sensor, soil temperature and humidity sensor, etc. Get all kinds of information about plants. Therefore, the temperature and humidity sensor used in agricultural greenhouses belongs to the sensing layer of the Internet of Things architecture.