Contents Abstract ii Preface 7 One. Introduction 8 (one). SCM development outline 8 (two). The general scheme design 10 (three). Hardware circuit design 11 a. Single-chip puter system 11 b. LED overview 13 c. External clock mode circuits 14 d. Reset circuit 15 (four). MSC - 51 chip profile 16 (five). Infrared sensors profile 19 (six). PROTEL 99 SE profile 20 Two. Systemic function 21 Three. System chart 22 Four. Design principle 23 (one). Smallest system module 23 a. Power module 23 b. Serial interface module 23 c. Microcontroller module 24 d. Clock circuit module 25 e. Reset circuit module 25 (two). Driver module 26 a. The voice module 27 b. regulated power supply module 27 (three). Lamp module of led 28 (four). Infrared sensors module 28 Five. The design of system software 28 (one). Core algorithm design flow chart 28 (two). System program 29 Six. Conclusion 37 (one). Test result 37 (two). Results 37 Seven. Summarize 37 (one). The whole system design ideas 38 (two). Commercial development value 38 Reference 38 Acknowledgement 39