Research And Implement Of Automatic Controlling Fertigation System And Multiharvested Node Power Supply

Fertilizing and irrigating controlling technique is a key technique in facility agriculture; however, because of the imperfect functionality, the measurement inaccuracy and unsatisfactory controlling performance of fertilizing and irrigating facilities, this technique is domestically on the preliminary stage. From the world-wide point of view, this technique has been much more developed and then marketed in other countries; some of marketed products have the ability of creating an automatic fertilizing and irrigating environment which is optimal for crops growth and create great profitability. In addition, how to supply stable power to wireless sensor network is one of the most bottleneck problems which restrict wireless sensor network’s large-scale promotion. Thus the automatic controlling fertigation system and multiharvested node power supply based on ZigBee has an influential realistic meaning and the technique this paper develops could be further applied. The main research results of the paper are as follows:(1) The automatic controlling fertigation system has adopted ZigBee technique to wirelessly fixate nodes, including sensor nodes and valve and water pump controller nodes; the ZigBee has facilitated the process of fixating, assembling/dissembling, adding/removing and moving.(2) The author uses the S3C6410developing board by Samsung and touch screens to formulate field controller node; perform data display and storage, switch controls and status display for self-priming pumps and valves.(3) Least square method solves the problem of the uncertainty of measurement and the large delay because of chemical reaction in the process of formulating solution, and it’s easy and quick and increase the precision of formulation; the system can formulate proper solution’s concentration and irrigation strategy depending on the season, and helps reduce the labor cost; and it thus can be applied broadly in the future.(4) According to the greenhouse’s specific requirements, the paper has designed node power supply that can convert solar power or water power into electricity; at the same time, a maximum power point tracking strategy has been developed to increase power collections; and then solves the bottleneck problem of providing stable power to nodes.