Experimental Validation of Quadruple Tank System using STM32 Microcontroller

Liquid level control is a crucial component of industrial process control in a variety of settings. Most of the industrial processes are nonlinear in nature. In this paper, one such non-linear, MIMO system with four interconnected tanks called a Quadruple Tank System (QTS) is presented. It has two pumps and two 3-port control valves. Voltage to the pump serves as the input while maintaining the valves in place, and the output is the level of liquid in a tank. The main objective is to keep the liquid levels in the bottom two tanks under control. The paper elaborates mathematical modeling of QTS. The formulated mathematical model is validated through experimentation with a 32-Bit Microcontroller STM32F746ZG Nucleo board. Waveforms are compared to validate the model.