Introduction - If you have any usage issues, please Google them yourself
Supermarket bar code added to detect charging system, combined with practical application, the design of a computer simulation applications require integrated application of the system parallel port, serial interface, timer interface, analog interface, etc. (subject to specific body to determine the specific interface) to achieve microcomputer control center with the lower machine to achieve long-distance transmission, and remote control and monitoring functions. Program flow chart that contains a complete code, run the debug results