tailieunhanh - Development of sensors and microcontrollers for small temperature controller systems

In this paper, a microcontroller-based fuzzy logic controller is introduced to stabilize at the desired temperature, while sudden changes in temperature can be severe. | Journal of Automation and Control Engineering Vol. 3, No. 4, August 2015 Development of Sensors and Microcontrollers for Small Temperature Controller Systems Ali Jebelli and Mustapha C. E. Yagoub School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, Canada Email: ajebelli@, myagoub@ Program Memory, 1-Kbyte SRAM, and 512 Byte EEPROM, 8 Channel 10-bit A/D-converter and JTAG interface for on-chip-debug. It operates at up to 8 MIPS throughput at 8 MHz at 3 Volt. The microcontroller includes PWM outputs for controlling motors and a serial RS232 port for communication with other devices. Abstract—In this paper, a microcontroller-based fuzzy logic controller is introduced to stabilize at the desired temperature, while sudden changes in temperature can be severe. This approach is applied to one onboard microcontroller which is on small board and the control system is able to meet the required respond quickly. The significance of this work is because of using a microcontroller with a fuzzy PI controller as the supervisor, and evaluated through experiments. It is shown that the characteristics of the fuzzy logic, such as flexibility of the I/O selection and saturation of the outputs, provide favorable performance to the control system for temperature system. Index Terms—fuzzy logic controller, proportional integral derivative (PID), pulse width modulation (PWM) I Figure 1. Microcontroller board INTRODUCTION The project deals with temperature based fan/heater controller system implementing fuzzy logic, comparing it with conventional control circuits like an ON/OFF control in which either fan/heater runs at their maximum intensity whereas fuzzy controller works according to the temperature, controls the speed of fan or the radiations from the heater and overcomes the limitations of conventional control circuits. So if the temperature changes, the fan speed or the heater radiation adjusts to keep the temperature at