Nutrient Solution Acidity Control System on NFT-Based Hydroponic Plants Using Multiple Linear Regression Method

Hydroponics is a cultivation method where the plants are grown by using water as the growing media. One of the solutions we can choose to end vegetables production quantity problem is by using a hydroponic technique called Nutrient Film Technique (NFT). This method utilizes the nutrient solution, circulating water, and oxygen to hasten plant growth and produce better result. One of the most important parameters to note here is the pH value. We have to maintain the pH value at a stable level. This research discusses the details of an automated pH control system by using multiple linear regression. This control system used Arduino Nano and NodeMCU with pH H-101 sensor. The accuracy result of the multiple linear regression tests with several reservoirs and several set points is 94.84%. For the overall system accuracy test, the result was 89.37%. Based on these results, we can confidently say that the multiple linear regression method can be used to control hydroponic acidity (pH).