Abstract
P89C58 SCM to the circuit as the center, using A44E Hall sensor location, and the taxi mileage statistics, and pricing. MAX813L watchdog circuit used to achieve a power-on reset manually reset voltage and surveillance functions, the system clock chip DS1302 preserved when power-down of the unit price, mileage and the wheels and display information such as length of time, human-computer interface using liquid crystal display, Reduce power consumption LCD backlight can be set manually adjustable lamp. Wei Hsin-huang, A6 and a thermal printer basic information. The circuit design of the meter can not only achieve pricing function, but also under the daytime, night automatically adjust pricing model, halfway waiting for the processing and cheating in order to avoid some of the tamper-resistant design features. After testing the basic design to achieve the basic design requirements and play a part, along with certain innovations.
Keyword: meter; Hall sensor; brown-out protection; anti-cheating
