Underwater IOT (Internet Of Things) system of VLC (Visible Light Communication) based on blue LEDs (Light Emitting Diodes)

The invention discloses an underwater IOT (Internet of Things) system of VLC (Visible Light Communication) based on blue LEDs (Light Emitting Diodes). The underwater IOT system is characterized in that underwater devices, underwater sensors, underwater terminals or underwater gateways are used as node units; the underwater IOT system is formed by the multiple node units according to a certain network interconnection topological structure, and the VLC based on the blue LEDs is used as an information transfer means between every two node units; the network interconnection topological structure of the underwater IOT system comprises a basic chain type network, a daisy chain type network or an AdHoc network. In the underwater IOT system disclosed by the invention, a high-brightness blue LED is adopted as a light emitting unit carrying a bidirectional blue LED receiving and transmitting module, so that three problems of low underwater communication reliability, high cost and high-frequency modulation difficulty are solved; a silicon-PIN photodiode having high flexibility in a visible light wave band is adopted as a light receiving unit, so that the problems of difficulties in realizing high-speed response, low price and high reliability are solved; through the measures, a high-speed information interconnection IOT system is provided for devices and terminals in underwater movement and underwater operation.