Underwater wireless sensor

A wireless sensor network comprising:

• a master control terminal;
• and
• a plurality of wireless sensor nodes directly communicating with the master control terminal and configured as a plurality of underwater wireless sensors, with each underwater wireless sensor comprising
• a floating-diving device enabling the underwater wireless sensor to submerge to a first predetermined water depth in response to a predetermined condition,
• a sensing device converting a plurality of environmental parameters into a plurality of environmental messages,
• a micro controller connected to the floating-diving device and the sensing device, and receiving the environmental messages and sending a command signal including the environmental messages,
• a communication device connected to the micro controller, receiving the command signal sent from the micro controller, sending the command signal to the master control terminal, receiving an external message including a second predetermined water depth from the master control terminal, and sending the external message to the micro controller so that the micro controller performs a corresponding operation and sends out a control signal to the floating-diving device to enable the underwater wireless sensor to move to the second predetermined water depth, and
• a solar power generator generating power, storing the power, and supplying the power to the underwater wireless sensor,
• the plurality of underwater wireless sensors including first and second underwater wireless sensors, with the first underwater wireless sensor being located at a working water depth and having a working radius, and when the power of the first underwater wireless sensor is insufficient, the first underwater wireless sensor moves to a specific area so that the solar power generator absorbs external light to be charged, and the second underwater wireless sensor moves into the working radius.