The development renewable energy uses is increasing, including micro-hydro power plants. A micro hydro power plant technically works by utilizing the height of the water fall, water discharge and water pressure. This energy is converted into mechanical energy by rotating the turbine shaft, after which the mechanical energy on the turbine shaft is transferred to the transmission and then connected to a generator to be converted into electrical energy. Due to the power losses created and the time factor, a micro hydro power plant needs regular checking or monitoring. However, conventional micro hydro power plants are still checked manually. So from the above problems, research was carried out in the form of designing a monitoring system for voltage, current and frequency in micro-hydro power plants based on the Internet of Things (IoT). From the monitoring of voltage, current and frequency, it is hoped that the actions will be taken and when the maintenance will be carried out. This design is done by designing software and hardware. Hardware includes the ESP32 microcontroller board which is used to read and process voltage, current and frequency sensor data from the PZEM-004T v3 sensor module and remotely control solid state relay (SSR relay). Then, software design such as the Internet of Things (IoT) is carried out using the Ubidots platform and connected to the internet via a Wi-Fi connection for monitoring and notification via Telegram messages. In the monitoring system testing, notification and control of SSR relays were obtained from the results of sending data to Ubidots and the success of sending SSR relay notifications and controls. Data transmission, notification and SSR relay control has a 100% success.

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