Process Control of Intelligent Coffee Coaster Machine

• Main Authors: WANG,LI-WEI, 王力偉
• Other Authors: TSAI,PU-SHENG
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/14860195895179681411

碩士 === 中華科技大學 === 電子工程研究所碩士班 === 104 === For a success coffee roasting, one has to deal with a complex process which controls pre-heat temperature, bean loading temperature, roasting procedure profile, drying and steaming steps, venting adjustment, temperature regulation (as of gas flow rate or electrical power control), first and second crack control, coffee unloading, and cooling, and all of those steps are often achieved by utilizing two knobs to control the heating and venting of a roaster. In order to retain the delicate flavor and aroma of the coffee, very often, having to rely on experienced experts; and as a consequence, it may be a difficult task to make a good coffee for a beginner. The purpose of this paper is to construct a fully automatic control coffee roasting device to replace the conventional counter one which may heavily rely on the manual adjustment, so that one can enjoy gourmet coffee at home in a relative easy fashion by just pressing a control bottom. For that reason, an intelligent coffee bean roasting system and method with expert’s experiences have been proposed accordingly. In this paper, two control modes including keypad panel and touch panel are designed as human interface respectively. By using rs232 serial communication or Bluetooth wireless transmission to receive coffee beans roasting parameters and the temperature profile of the roasting process is displayed on the PC screen or touch panel. Due to roasting profile or curve is collection of temperature variation or fluctuation during the entire roasting process, and for different coffee varieties or regions of production, different roasting profiles have been investigated and defined in several different roasting modes. Also, one can selectively adjust the profile at particular interest. The proposed system uses chip (PIC18F452) as a micro controller, implementing temperature profile from the top notched expert and embedded as a basis with unique characteristics, and that includes roasting procedures as follow: (1) roasting profile optimization, which is aimed for some well-known coffee beans up to eight varieties, such as Blue Mountain, Mandheling, and Mocha, etc.; (2) customized parameters, which allows one to input and define individually up to ten data sets, the data sets can be save to E2PROM of microcontroller or WEINTEK’s touch panel(MT6071iE); (3) complete manually operation, which allows one to explore freely at one’s own interest by manipulating two knobs to control the power and air dissipation; and (4) roasting process data recording, which allow one to print, log, and on-line editing roasting parameters, via USB linkage, back and forth between a computer and the controller.