Copyright © 2018 Authors. This is an open access article distributed under the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. International Journal of Engineering & Technology, 7(4.16) (2018) 308-312 International Journal of Engineering & Technology Website: www.sciencepubco.com/index.php/IJET Research paper Fuzzy Ponics: a Fuzzy Based System to Control Temperature, Relative Humidity, Electrical Conductivity and PH of Hydroponics Armie E. Pakzad 1 *, Abbas Ali Pakzad 2 1 Electronics and Communications Engineering Dept., De La Salle University Manila, Philippines 2 School of Computer Studies, Arellano University Jose Abad Santos Campus, Pasay City, Philippines *Corresponding author E-mail: armie.pakzad@dlsu.edu.ph Abstract Hydroponics is a process in which plants grow in a nutrient solution instead of soil. It is a controlled environment agriculture (CEA), which needs intensive controlling of the greenhouse environmental condition such as temperature and relative humidity (RH) along with electrical conductivity (EC) and pH of nutrient solution. A successful Hydroponics System (HS) depends on the way the greenhouse is maintained in terms of the environmental condition and the plant’s nutrient uptake. This paper presents FuzzyPonics, a system which focuses on the application of fuzzy logic algorithm to automatically control the temperature and RH of the greenhouse, alongside EC and pH of the nutrient solution. The identified input parameters were classified accordingly, relative to predefined linguistic outputs and solu- tions. Sugeno-style of Fuzzy Inference System (FIS) and triangular membership functions were used. The results were simulated using the rule viewer of Matlab Fuzzy Logic Toolbox for six FIS and the proponents were able to get favorable results, which only showed that a fuzzy logic controller is a powerful tool to control the environmental condition and the nutrient solution’s pH and EC of a hydroponics system. Keywords: Controlled Environment Hydroponics; Electrical Conductivity and pH; Fuzzy Logic; Hydroponics Temperature; Relative Humidity. 1. Introduction A number of researches in developing automated systems for agri- cultural application have been done. One of the well-liked topics in research related to agriculture is the development of automated soilless farming system. Hydroponics system (HS) or the so called soilless culture (SC) which allows crops to grow in a nutri- ent solution, earned its popularity for decades [6] due to its flexi- bility on growing wide variety of crops especially in a controlled environment [10], [8]. Since HS is considered as controlled envi- ronment agriculture (CEA), it is very important to maintain the environmental condition as well as the nutrients taken by the plants. With this, an automatic system that will monitor and con- trol the foregoing parameters should be considered. Different approaches have been proposed for making an automated HS [1], [2], [4], [5], [6], [7], [9], [10]. Fuzzy logic is one of the advanced algorithms which has been applied in some papers [2], [6]. How- ever, some authors’ concentrated on the adjustment of pH and EC of the nutrient solution only [1], [2], [4], [5], [6] while others fo- cused on controlling humidity and temperature [7]. This paper presents FuzzyPonics, a fuzzy logic design that will monitor and adjust the four important parameters in controlled environment Hydroponics namely, temperature, RH, pH and EC. 2. Literature review This section presents concepts on hydroponics and the significant researches related to this study. 2.1. Hydroponics HS is a process in which plants grow in a nutrient solution [1], [2]. Some growers use media which includes perlite, vermiculate, brick shards and wood fiber. Several techniques can be used to implement this practice such as EBB and Flow, Nutrient Film Technique (NFT) and Dynamic Root Flowing Technique (DRFT) to name a few [6], [2], [1]. In HS, plants grow faster because nutrients are delivered directly to the roots of the plants, thus pro- moting higher productivity in a short span of time [4], [5]. Com- pared to soil gardening, HS has less water consumption and plants are grown in a sterile environment, hence there is a lower chance of contamination. Moreover, it requires less space for growing and seasonal crops can be produced all year round [7]. 2.2. Controlled environment agriculture HS is a CEA where temperature and humidity are one of the pri- mary factors to be considered for a successful crop production [9]. Different types of plants require diverse temperature and relative humidity ranges. Warm season crops like tomatoes, peppers, egg- plants, beans, squash, melons and herbs grow best in the ideal range of 70°F - 80°F during daytime and 60°F - 70°F at night time. Cool season crops like broccoli, cabbage, lettuces, endive, peas, spinach, green onions, on the other hand can have optimum growth in 60°F - 70°F day temperature and 50°F - 60°F at night [3]. The use of oscillating fans and lighting equipment aids in the adjustment of the temperature whenever it falls out of the ideal range. Relative humidity (RH) is also an important aspect that