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Abstract
In the nutrient film technique (NFT) hydroponic system, plants require certain pH and
nutrient conditions. The research in this paper aims to create a pH and TDS control
system using a fuzzy method. As well as using the basis of IoT to display parameters
from hydroponic environmental conditions. To obtain error values and delta errors using
the difference in pH values and TDS values on the TDS SKU:SEN0244 sensor and sensors
with the PH-4502C module as fuzzy logic input. The output produces PWM for the
L298N motor driver so that the pump speed in giving the solution is in accordance with
the set point conditions. Sensor reading values will be interpreted on the LCD and the
Blynk platform uses the ESP8266 module to connect to the internet. In testing the pH
sensor, it has an average error of 2.23%, while the average error value on the TDS sensor
is 4.13%. By using a control system that has been designed, it has produced water
conditions with maintained pH and nutrients, and is able to display environmental
conditions such as pH, TDS, temperature and humidity on the Blynk platform
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