Agricultural Data Acquisition System Based On Radio Frequency Networking

In recent years,with the development of agriculture and science and technology,more and more modern equipment is used in agricultural production,especially wireless sensing technology is being applied more and more in agricultural greenhouses.The wireless sensor technology can be used to collect the environmental parameters of temperature,humidity and carbon dioxide in the agricultural greenhouse in real time,and upload it to the background server to monitor the environmental status of the greenhouse in real time through the front-end webpage.The application of modern monitoring equipment not only reduces the workload,but also monitors the data more accurately and in real time,increasing efficiency and increasing crop yields.The hardware part of the system is mainly composed of a front-end data acquisition system module,a relay data terminal module,an intermediate node module and a relay control module.Each module includes a master MCU,a radio frequency module NRF24L01,and the like.Each module communicates with the radio frequency module NRF24L01.The front end transmits the collected data to the intermediate node through the radio frequency,and the intermediate node transmits the data to the relay terminal.Finally,the relay transmits the collected data to the background server through the GPRS module,and is received and processed by the background and displayed in real time on the webpage.If the measured value exceeds the set threshold,an alarm is generated,the webpage end issues a control command,and the relay control module receives the command control relay to open the roller shutter or the water valve.In the lower computer software part,mainly the communication between the radio frequency modules,including short-range wireless communication between the front end and the intermediate node,the intermediate node and the relay terminal.And the front-end data acquisition module reads the sensor data and the relay terminal transmits the data program to the background through the GPRS module.The test shows that the wireless communication module with NRF24L01 is in line with the system design requirements,which not only has great advantages in transmission distance,but also can customize the communication protocol in practical application and is convenient to use.In terms of networking,the number of intermediate nodes is determined according to the number of greenhouses,and the front-end acquisition module can transmit data to the intermediate node or directly to the relay terminal.The system from the front-end data acquisition to data transmission,and finally displayed directly on the web page of the host computer,to meet the initial design requirements of the system,has a high practical value.