Liquid level system as a pedagogical tool to teach fuzzy control

In this paper is presented a tool to develop student practices of fuzzy logic, focused on fuzzy control. The system corresponds to liquid level control system connected to a computed for the fuzzy control system. A data acquisition system was implemented for the communication process. The system consists of sensors, two actuators, serial communication channel and a microcontroller. A multitasking scheme was implemented in the microcontroller for several tasks, such as sensor read, transmission and reception data and PWM configuration. The system is controlled in Matlab with Fuzzy Logic Toolbox, which allows working with linguistics variables and membership functions (triangular MF, trapezoidal MF, Gaussian MF, among other). In the programming process, the system sends signals in order to control the level of the tanks in a correct and stable way. The experiment results showed that the proposed pedagogical tool allowed to undergraduate students test different kinds of intelligence controllers over the same system rapidly, focusing on the theoretical concepts applied to the real process.