A user need only approach the PAWS machine, identify themselves using their student ID number through a numeric keypad, and insert a $5 bill. PAWS give feedback to the user through a 16x2 character display.
The paws machine interfaces to NCSU's Eos/Unity computer network, using system calls to the lpquota command and accesses a SQL database containing user names and student ID numbers. Interface is accomplished by sending and receiving commands to a dedicated workstation via RS-232 serial line. PAWS control is accomplished with a Motorola MC68HC711E9 development board.
The PAWS system is complete, but some security issues will need to be resolved before a generic daemon can be developed and PAWS can be installed for student use.
1: Problem Description
2: Project Analysis
3: Design Considerations
3.1: Processing Platform
3.2: Host Server
4: Design Decisions and Implementation
4.1: The 68HC711 Micro-controller
4.2: Interface of PAWS to Eos
4.3: Function of PAWS
4.4: Activity of the PAWS Host Server
4.4.1: Simulation of lpquota command and SQL database
4.4.2: The PAWS Host Program
4.5: Maintenance and Service to the PAWS System
5: Observations and Conclusions
6: Installation of PAWS on the Eos/Unity Network
Appendix A Newsletter Article
Appendix B Hardware Description (courtesy R. Wigley and D. Creech)
Appendix C Source Code for PAWS Server
Appendix D Source Code for MC68HC11
Appendix E lpquota Simulator Source Code
Appendix F Cash Inventory Program Source Code