Design of Smart Bus Coin Boxes Based on iButton
Xiao Yangen · Modern Electronics Technique · 2008
In order to improve the security of bus coin boxes,the system uses key of the iButton DS1991 to open the password lock of coin boxes.The DS1991 is a rugged read/write data carrier that acts as three separate electronic keys,offering 1152 bits of secure,nonvolatile memory.As each secure memory block is 64-bit password and ID fields,it can prevent the event that the cash in coin boxes are stolen for poor security of password lock.To reduce the false coins influencing efficiency of public traffic company,the system uses eddy current sensor to detect the false coins,which can effectively prevent the use of the false coins.The system has solved the long-term problem that the cash in coin boxes are stolen,and it has improved the efficiency of public traffic company.The system has very high generalizing value.