| dc.description.abstract | This research focuses on the development of an automatic control system capable of
regulating pH and temperature during the fermentation process of kombucha tea
based on the Internet of Things (IoT). Kombucha is a functional beverage produced
from the fermentation of sweet tea with a symbiotic culture of bacteria and yeast
(SCOBY), whose quality is highly dependent on pH and temperature conditions.
Instability in these parameters can lead to variations in taste, reduced nutritional
value, and even risks of contamination. Therefore, a control system that can monitor
and maintain fermentation stability in real-time is required. In this study, a prototype
system was designed using the ESP32 microcontroller integrated with the E-201C pH
sensor kit and the DS18B20 digital temperature sensor. The measurement data are
processed and displayed through the Blynk application, allowing users to monitor
conditions remotely. In addition, actuators such as a heater, exhaust fan, servo, relay,
and solenoid valve are automatically controlled to maintain the fermentation
parameters within the optimal range. The experimental results showed that the system
successfully maintained the pH in the range of 2.5–4.2 and the temperature between
25–30 °C, which are the ideal conditions for kombucha fermentation. Sensor accuracy
tests indicated an average error tolerance of less than 5%, with the pH sensor showing
a precision of 0.69% and the DS18B20 temperature sensor achieving 97.54%
accuracy. With this performance, the developed system proved effective in improving
the consistency of kombucha quality and demonstrated the potential of IoT-based
technology in supporting the fermentation process of functional beverages. | en_US |
