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This work consists of the development and improvement of a low-cost teaching bench to assist students in the learning process in the Control Theory discipline. The system consists of a ventilation tunnel, built of acrylic, with 4 temperature sensors and a lamp inside of it. The lamp intensity can be changed manually. At the inlet fo the tunnel, ventilation is forced with the aid of a mini-fan, cooling the system, which can be rotated manual or automatically. An Arduino board performs the acquisition, processing and transmission of data to a supervisory system, which allows you to view variables, change lamp intensity, mini-fan rotation and adjust the parameters of the Proportional Integral (PI) controller. The system has two modes of operation: manual and automatic. In manual mode, the user can select the voltage levels applied to the lamp and the mini-fan, using the two trackbars of the supervisory system. This mode was used in the construction of the Ziegler-Nichols reaction curve, which was the approach used to identify the system, enabling the design of the PI controller in four tuning methods used (Ziegler-Nichols, Cohen-Coon, Chien, Hrones and Reswick and Internal Control Model). In automatic mode, the PI controller is activated and automatically adjusts the voltage level applied to the mini fan, which acts by regulating the system temperature. In this work, the development of an easy to use didactic platform, with open source and hardware, was carried out so that the student can explore concepts of Control Engineering through practical activities. The average price spent on the material used in the construction of the didactic bench was approximately 130 reais, so it was possible to build it at a much lower price and with a function very similar to the system proposed by the Quanser company.

Bancada de transferência de calor para práticas de teoria de controle