STEP VARIATION STUDIES OF ARM7 MICROCONTROLLER BASED FUZZY LOGIC CONTROLLER FOR WATER-IN-TANK LEVEL CONTROL
L. Shrimanth Sudheer, P. Bhaskar, C. Parvathi · 2013
Design and development of ARM7 microcontroller based fuzzy logic controller (FLC) for water-in-tank level system is presented in this paper. A continuous tank of 100cm X 20cm X 20cm dimension with one inlet and one outlet is considered. The outlet flow of water is let open continuously to a reservoir and inlet flow is controlled by a pneumatic actuated valve. The valve opening is controlled according to the water level in the tank in order to make the deviation zero. The necessary hardware and software is developed indigenously. FLC algorithm is written in embedded C in KEIL µV4 integrated development environment. The main objective of the experimental work is to improve the performance of the conventional PID controller by replacing it with modern FLC. The proposed controller is subjected to both step and step-variation (stair-case) inputs. The performance is compared with PIDC and necessary performance indices are found from the plots and tabulated. It is observed that FLC outperforms the conventional PID in terms of quicker rise-time and better tracking of the input.