The traditional payments in college canteens has some defects,such as inefficiency,inconvenience,high administrative cost and easy damage of cards.To overcome these drawbacks,a design scheme of college canteen punch card system based on CAN bus technology is proposed through the research on combining CAN bus technology with non-contact smart card technology.The hardware-software design of the card issuing node and card punching node of lower computers was completed.The development of the upper computer management software was fulfilled.The safe...