Underwater environment sensors with visible light communication systems

Kidsanapong Puntsri; Ekkaphol Khansalee; Puripong Suttisopapan

Authors

Kidsanapong Puntsri Department of Electronics and Telecommunication Engineering, Faculty of Engineering, Rajamangala University of Technology Isan, Khonkhaen Campus, Khonkhaen 40000, Thailand
Ekkaphol Khansalee Department of Electronics and Telecommunication Engineering, Faculty of Engineering, Rajamangala University of Technology Isan, Khonkhaen Campus, Khonkhaen 40000, Thailand
Puripong Suttisopapan Department of Electrical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40000, Thailand

Keywords:

internet of things, light communication, realtime monitoring, underwater environment, visible light communication

Abstract

This work presents a design and experiment of a new expectation for fresh underwater exploration, where the visible light communication (VLC) is employed as communication systems. The overall system is designed for a simple circuit and low-cost. The transmitter, which is located in the underwater, is responsible for transmitting the temperature and pH sensors information data. The LEDs (Light emitting diode) array with 10W power is used, where only one transistor driver circuit is proposed. The baud rate is 9,600 b/s (baud per second). At the receiver, 4 APDs (Avalanche Photodiodes) are utilized to receive and that converts the light signal to electrical signal. Since the input voltage of ESP8266 requires 5V, the summed 4-APD outputs by using equal gain combining (EGC) is needed. As a result, the amplitude between 3.3 V and 5 V is achieved. In this work, ua741 is used for the amplification IC, while ESP8266 is adopted for data processing and that sends the sensor data value to the internet. Netpie is used to store the data. To verify the system performance, the result was recorded for one hour with the communication distance of 125 cm (1.25 meters). It is shown that the system works very well and improves a lot, when compared with only 1- or 2-APDs receiver. Especially, this work can be used in the industry for replacing the traditional underwater exploration and provide greater safety in exploration in the future.

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