In this article is presented the development of closed loop control techniques that optimize the fish production in closed environment, by controlling the water temperature. It is possible to see that plenty of rudimentary techniques are still used in this area, which involves a lot of money, R$ 2.02 billions in revenue just in 2013, according to IBGE. There is, in this project, the process automation using microcontrollers, sensors and actuators. With the system's mathematics models, that will provide enough data about the water temperature, digital controllers are calculated and programmed on the microcontroller used throughout the project, boosting the fish's growth and reproduction.
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