使用keil完成的数字到模拟功能的实现，51单片机为平台而实现-Use keil to complete the realization of the function of digital to analog, 51 single-chip computer as a platform to achieve

用51单片机模拟出租车计价器，性能优良、稳定性好-51 single chip microcomputer was used to simulate the taxi meter, excellent performance and good stability