摘要出租车计价器系统是一个基于51单片机STC89C52系统的毕业设计作品，它组成主要通过几个电路相互连接而构成的，其中最重要的部分是用来复位重启系统的电路以及用来计时的时钟电路，在系统中各个设置按键以及模拟按键之间也构成了按键电路，为52单片机STC89C5需要初始化将数据状态显示都清除复位时则主要利用了其中的复位系统,它不仅仅是通常的初始化,为排除困难,利用复位部分也可以达成重新工作的效果。而用以产生规律性时间顺序的电路则是使用12MHz的石英晶体谐振器作为整个系统的时钟源提供脉冲,如此做的目的是使得整个系统具有更稳定更加准确的性能。68862

出租车计价器中用于显示数值观察的部分是由字符型液晶和及其连接的电路共同组成的，液晶型号为1602他能显示两排液晶数据，第一排用来显示时间以及当前速度而第二排则是显示公里单价等待时间和总计的价格收费，其中我们需要自己提前设置好的数据分别是出租车的起步价格，出租车每开1公里所需要乘客缴纳的费用以及在行驶过程中出租车因各种情况停下来等待的时候每分钟所收取的费用，同时在白天和晚上我们的各项参数可以有所不同，另外一个可以设置的参数是出租车的速度，他们的设置方式都是通过按键电路按键达成，而速度设置则和直流电动机有关，它的作用主要是对出租车的各种行驶状态进行模拟并在一定时间段内得到一定的行程从而进行计价。出租车计价器的主要作用还是将总的收费在1602液晶上进行显示，实际上总的收费除了起步价以及里程计算的价格外还要加上因乘客原因出租车停止等待所耗费的费用三者之和，而这里这里价格计算数据收集信号接收与传输显示都是利用了STC89C52单片机作为整个系统的控制核心，是系统最关键的部分，而传输信号加以显示在液晶中则是通过其P1接口达成的。

毕业论文关键词：STC89C52  1602字符型液晶  霍尔测速仪  

Microcontroller-based taxi meter design

Abstract

Taxi meter system is based on a graduate design work 51 single STC89C52 system, which is mainly composed by several circuits connected to each other and constituted the most important part is to reboot the system and reset circuit for the timing of the clock circuit in each setting the system also constitutes between keys and buttons simulate a key circuit for the microcontroller 52 STC89C5 need to initialize the data status display are cleared when you reset the main use of which resets the system, it is not just the usual initialization for overcome all difficulties, using the reset portion may also be re-work to achieve the effect. The regularity of the time sequence to produce a circuit is to use 12MHz quartz crystal resonator as the clock source of the entire system to provide a pulse, so aim is to make the whole system more stable and more accurate performance.

Taxi meter for liquid crystal display section is composed of the character and its circuit connections composed of liquid crystal model values observed for 1602 to show his two rows of liquid crystal data, the first row is used to display the time and the current speed the second row displays the total price per kilometer of the waiting time and the price charged, which we need our own good data are set in advance starting price of taxi, taxi passengers per kilometer open 1 to pay the costs and the need for during travel charged when the taxi stop to wait for a variety of situations per minute charges, while during the day and in the evening we can vary the parameters, the other parameters can be set taxi speed, the way they are set through the key circuit button fulfilled and set the speed and DC motor related to its main function is to various driving state taxi simulation and to a certain period of time a certain stroke thereby performing valuation. The main role of the taxi meter or the total of the charges in 1602 on the LCD display, in fact, the total mileage charge in addition to the starting price and the price calculated by passengers plus external reasons to stop waiting for a taxi costs spent three sum, here and here prices data collection signal reception and transmission display are the use STC89C52 microcontroller as the control of the entire system, is the most critical part of the system, and the transmission signal to be displayed on the LCD in the interface is achieved by its fear of