Tuesday 28 August 2012

FINAL YEAR PROJECT







PID CONTROLLER
PID is "proportional", "integral" and "derivative" controller. I've choose PID controller is because the simple structure of PID itself, easy to understand and possible to do the manual tunning as well as a PID calculates an "error" value as the difference between a measured process variable and a desired set point. The controller attempts to minimize the error by adjusting the process control inputs. The PID controller is mostly approach to the industrial field.


WHY USED IT? 


  1. It helps get your output temperature where you want it, in a short time, with minimal overshoot, and with little error.  
  2. PID is the main popular method of control in industry since it is probably the most extensively used method in industrial process control applications. 
PID controller structured is basis on three most important controller structures which there are proportional, integral and derivative controller which include in single packages of controller. The PID controller also have some disadvantages that be a factor which lead to be unsatisfactory in tuning PID controller.








PIC16F887






PIC stands for "Peripheral Interface Controller". This powerful 200 nanosecond instruction execution yet easy to program that only 35 single word instruction CMOS FLASH based 8-bit microcontroller packs Microchip's powerful PIC architecture into a 28 pin package. It's also low cost and high clock speed. It's code is extremely efficient, allowing the PIC to run with typically less program memory than its lager competitors. A simple instruction set and seamless migration between product families make this PIC the logical choice for design requiring flexibility and performance. One of the advantages is that yet easy to program that only 35 single word instructions CMOS FLASH based 8 bit microcontroller packs Microchip's powerful PIC architecture into a 28 pin package. 

SPECIAL MICROCONTROLLER FEATURES:



  • Precision Internal Oscillator:
    • factory calibrate to 1%
    • software selectable frequency range of 8 MHz to 32 MHz
    • software tunable
    • two-speed start up mode
    • fail-safe clock monitoring for critical applications
    • clock mode switching during operation for low power operation
    • power saving sleep mode
    • power on reset (POR)
    • selectable brown out reset (BOR) voltage
    • extended watchdog timer (WDT) with its own on-chip RC oscillator for reliable operation
    • self-reprogrammable under software control
    • programmable code protection
    • capture/compare/PWM (CCP) module

THANK YOU
Posted by sakinabahruddin at 15:12

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SAKINA NOORSHEILA BINTI BAHRUDDIN

SAKINA NOORSHEILA BINTI BAHRUDDIN
51211111068

PROJECT SCOPE

The project scope to produce the proposed product including the process of researching the ideas, references, and information to develop a high quality of temperature control devices that having a low cost systems and beneficial. Another project scope is to analyze how the PID controller can be implemented with the microcontroller to produce accurate results and controlling the temperature as well.

ABSTRACT

This temperature sensing project requires controlling or reducing the temperature of the full running machine that produce the extreme temperature that can cause failure. The basic concept of project is the input of temperature sensor will act as the input device and read the temperature. The reading signal should be sent to the PIC16F876A microcontroller and operate as the PID controller system as the controller to reducing the hot air. Lastly, buzzer set as alarm should be start to operate to give warning which alert the users that the equipment working at the excessive temperature. The actions can reduce the cost of maintaining of failure equipment and also can improve the reputation of the production sites. In addition to this, the proposed project will be implemented for the low cost product so that this systems or product can be sold for education purposed.