Design of Seawater Parameters Measuring Device and Data Storage System Using Node MCU ESP8266

The literature on seawater quality monitoring is increasing, with various systems proposed. This article describes the design of a seawater parameters measuring device and data storage system using a Node MCU ESP8266. This device is designed to be very easy to operate, including for fishermen who catch fish at sea. Three sensors measure seawater parameters: temperature, pH, and salinity. The data obtained from these sensors is sent to the Node MCU ESP8266 and stored first as a solution to the absence of an internet connection at the time of data collection when fishermen catch fish at sea. When connected to the internet network, the data stored in the MicroSD card is sent to the server using the WiFi Module on the Node MCU ESP8266. The data on the server can be accessed via the web. Fishermen operate this device by charging the battery before leaving to catch fish. Arriving at the location to catch fish, fishermen put this device into the water. The device is tied with a rope to the net used by the fisherman or tied to the boat. To motivate fishermen to carry the device, it is also equipped with a fish caller to attract fish to approach the fishing gear.