Design and Development of a Tofu Wastewater Acidity Monitoring System Using ESP8266 Module Based on IoT

This research discusses the design and development of an Internet of Things (IoT) based monitoring system for the acidity of tofu water. The background of the research is based on the importance of maintaining water quality in the tofu production process, particularly the pH parameter, which directly affects the taste, texture, and safety of the product. This system is designed using the ESP8266 as the microcontroller, E-201C pH sensor to measure acidity levels, DS18B20 temperature sensor, a 16x2 LCD as a local display, and the Blynk application as a medium for remote monitoring. Test results show that the system can display pH and temperature values of the water in real-time and send automatic notifications to the Blynk application when the pH value is outside the standard threshold.