Introduction - If you have any usage issues, please Google them yourself
Summary
P89C58 microcontroller circuit in the center of Hall sensor distance by A44E and realize taxi mileage statistics, and for pricing. Achieved by the watchdog circuit MAX813L on reset, manual reset, and voltage monitoring functions, the system clock chip DS1302 power-down time stored in the unit price, mileage, wheels, and display the length of time such information, human-computer interface with liquid crystal display, to reduce Power LCD backlight can be set manually adjustable. And Wei Huang A6 thermal printer used to print basic information. The circuit design of the meter can not only realize pricing function, but also according to day and night modes automatically adjust pricing, halfway to wait for processing, and cheating in order to avoid some of the design of anti-cheat functions. The design tested the basic design requirements to achieve a basic and play some, as well as some innovative