When the running time of the metro train is accumulated,the wheels are worn,which makes the wheel di-ameter smaller,and leads to the inaccurate speed value displayed by the metro train speedometer.The metro train speedometer is designed based on MC9S12G128MLL single chip microcomputer.This paper puts forward the design requirements of the metro train speedometer,analyses the design principle and hardware structure of the metro train speedometer,designs the hardware circuits and software of the metro train speedometer,and carries out simulation test on the platform of single chip microcomputer development board.The test results show that the speedometer de-sign scheme is feasible.
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