本设计采用STC89C52单片机为主控器，实现对出租车的计价设计，输出采8段数码显示管，74LS245芯片和74LS138芯片驱动。本电路设计的计价器不但能实现基本的计价，而且还能根据白天，黑夜来调节单价，同时具有计时功能。-This design uses STC89C52 microcontroller-based controller, the taxi meter design, output adopted 8-segment display tube, 74LS245 chips and 74LS138 chip driver. The circuit design of the meter can not only achieve the basic valuation, but also according to the day and night to adjust the unit price, at the same time has a timer function.