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In this paper a ultrasonic level meter for accurately and simply measuring oil levels of vehicle transmission is developed and its effectiveness is shown by experiments. By using a FPGA, all digital signal processes for the oil level calculation is fulfilled, and the programming on a FPGA project IDE enables very short developing time. And besides, analog circuits including a transmit/receive switch, multi-stage active filters and an envelope detect circuit are designed to process low-level ultrasonic echo signal. Under experiments, the designed level meter has proven to have the accuracy of about within 1[mm] scale. Key Words : Ultrasonic, Oil Level Meter, Vehicle Transmission, FPGA(Field Programmable Gate Array) * Corresponding Author : Moon-Ho KangTel: +82-10-8837-5349 email: mhkang64@gmail.com 12 07 27  (1 12 08 30, 2 12 10 30)  12 11 08 1.   ,                  .            ,       .  ,  (, ,  )   ,                .            ,     A/S           .       [1-3]               ,     A/S    FPGA(Field Programmable Gate Array)      . FPGA Xilinx  XC3S200 [4]

A FPGA-based Development of Ultrasonic Level Meter for Measuring Oil Levels of Vehicle Transmissions