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최만식,한대윤,이병택,이재현,이덕동 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
We proposed a magnetic card system for the use of the automatic city gas payment system. The currently used gas meter system was replaced by a photocoupler. The number of pulses by the photocoupler was proportional to the amount of gas consumption. The designed control part of the system consists of microcontroller, LCD, 8255PPI, ROM(32K byte), and so on. This subsystem read the number of pulses generated and subsequently changes information recorded on the magnetic card.