Design of Feed Automation System and Water Quality Monitoring in Louhan Fish Aquarium Based on the Internet of Things

The development of ornamental fish farming in Indonesia continues to increase, especially in freshwater ornamental fish. One of the freshwater ornamental fish that is in great demand by the public is the louhan fish. In its development, louhan fish maintenance activities often encounter obstacles and require perseverance in maintaining them so they can grow properly. Routine feeding of louhan fish is important because it determines the nutrients for its growth and development. Common problems that are often encountered in louhan keepers are lack of time, having other activities, and being in a remote position that makes it impossible to constantly feed and monitor. Therefore, this study designed an automatic feeding system and water quality monitoring in a louhan aquarium using a microcontroller from ESP32 which was then integrated with the DS3231 Real-Time Clock Module, DS18B20 Temperature Sensor, pH-4502C Sensor, TDS-SEN0244 Sensor, SG- 90 Servo Motor, Relay, Buzzer, Heater, Liquid Crystal Display, and other electronic components. The results of testing the feed automation system, namely the accuracy of the Real-Time Clock Module, obtained a delay of 10 seconds and the Servo Motor movement system can issue an average feed weight of 0.072 grams in 1 rotation of the motor with an angle of 150° and a delay of 1 second. The test results on the water quality monitoring system were carried out on three indicator variables, namely temperature, degree of acidity (pH), and total dissolved substances (TDS) in water which had a relatively small average error rate. The results of testing the heater in stabilizing the aquarium temperature, the average period of the heater in the on condition until it turns off reaches 13.11 minutes.