Research On Monitoring System Of Temperature And Humidity For Greenhouse

With the popularity of greenhouse technology, greenhouses increasingnumber of vegetable greenhouses, the most important factor is the temperatureand humidity control. Temperature discomfort, vegetables will not grow well.At the same time, the humidity should also affect the development of thevegetables. So you want to temperature and humidity is always controlledwithin the range suitable for vegetable growth. Temperature control to manualcontrol alone consuming and manpower, but also prone to errors. To this end, inthe modern vegetable greenhouse management commonly used automaticmonitoring system of wireless temperature and humidity, to control thetemperature and humidity of the vegetable greenhouses to meet the productionneeds.This paper analyzes the characteristics of the wireless radio frequencytechnology, and the wireless temperature and humidity monitoring systemdesign. In this design, DHT11is selected as the temperature and humiditysensor, STC89C54is selected as the control chip of the system, usingnRF24L01as the wireless transceiver module, LCD1602is used as the liquidcrystal display module. The wireless monitoring system of temperature andhumidity transmitter and receiver hardware circuit and software design, and theinstallation and commissioning. Temperature measurement range of the systemis0to50℃, the error is0to1℃; humidity measurement range is10%RH~90%RH, the error is+5%~-5%RH, the operation of the response time is less than10seconds. In the free zone, the effective transmission distance up to100meters, buildings or other obstacles, the effective transmission distance up to50meters, in line with the requirements of the design specifications to achieve theexpected, surveillance and monitoring of greenhouse environment function. Thesystem realizes intelligent on the greenhouse temperature, illumination andother factors control, and automatic control and other important environmentalfactors, completed the design task book the specified target.