Nutrient Film Technique (NFT) hydroponic monitoring system based on wireless sensor network

Hydroponic is one of the farming method without soil, but it uses water that contain nutrition. Nutrient solution is very important to define the successful of hydroponic cultivation. One of hydroponic technique is Nutrient Film Technique (NFT). System NFT uses nutrient solution to drain on the root area. pH level which is good for lettuce is 6.0-6.5, meanwhile the Electrical Conductivity (EC) level which is suggested is 0.8-1.2. Factor of pH and EC need to monitor 24 hours during the growth period. Hydroponic system requires wide area. However, in urban areas, the hydroponic green house can't get a wide area only in one place. This system is used to solve the problem in the real time monitoring lettuce cultivation hydroponic NFT. The method in this system contains communication, planning, modelling, construction, and socialization. The result of experiment shows that pH sensor has an error level of difference is 0.4. There is an error of sensor Analog Electrical Conductivity Meter, that is 5.1 ms/cm.