Pond farmers in Demak Regency, especially in Tambakbulusan Village, face challenges in maintaining the optimal quality of brackish water ponds. Uncontrolled fluctuations in temperature, pH, and salinity hurt the growth of brackish water biota, including shrimp and milkfish. Therefore, it is necessary to develop technology and innovation, such as an IoT (Internet of Things)-based water quality monitoring tool that allows farmers to monitor pond conditions in real time from a distance. This monitoring uses a website that is integrated with localhost so that special treatment can be carried out more quickly. In making this IoT-based monitoring tool, pH, temperature, and salinity levels were tested. The results obtained were that the pH, salinity, and temperature levels in pond water were still within normal limits. Community service activities in Tambakbulusan Village, Karangtengah District, Demak Regency have succeeded in increasing the productivity of brackish water pond farmers for milkfish and shrimp. In the future, it is hoped that there will be follow-up activities, namely the addition of fresh water when there is an increase in salinity levels in brackish water ponds automatically, so that the community feels more helped.
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