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C51 microcontroller program Taximeter 1 meter, the system works basic principle 1.2 1.1 Function 2, SCM 2.1 minimum system hardware design unit 2.2 A44E Hall sensor storage unit 2.4 unit 2.3 AT24C01 adjust the keyboard display unit 3, unit 2.5, software main design 3.1 3.2.1 3.2 miles interrupt program half-way waiting for counting the interrupt process interrupt program 3.2.2 computer program 3.4 3.3 3.5 keyboard display program procedures 4, summarized in Appendix A References Appendix B System System Diagram source