Abstract
Vehicle odometer is applied in each kind of motorcycle extensively, although the
traditional machine type odometer stable and credible, but the function of it is single and be
easily worn away. Along with the technical fast fiercely develop in electronics, the electronic
vehicle can be applied extensively. Recently, a lot of car appearances have already used the
electronic vehicle odometer, this graduation thesis introduce a kind of intelligence electronic
vehicle odometer, which is based on a Single-Chip Microcomputer system. The electronics'
type vehicle odometer is a kind of numerical type appearance, which mainly constitute with
two parts, that is vehicle speed meter and odometer, it adopts the light sensor that the sensor
has no contact measure. It not only can show the total mileage that vehicle drive, but also can
show the stage mileage of a period of time. Moreover, It’s can show the car speed, and the
realization exceed the speed limit to report and so on. It also has the ability of strongerly
develop again. The way of this vehicle odometer carry out is as follows: through the installed
measure plate in the automobile shaft, use the light sensor to measure the rotational speed
information. Under the pulse appearance, it make the variety rotational speed change to the
variety of the light flux, after that the variety of the light flux convert to electricity quantity.
Then through the light electricity convert component, we can make the pulse signal input to
the Single-Chip Microcomputer by the frequency measure circuit. Then in terms of the
function relationship of electricity quantity and rotational speed, we can realize the measure
of rotational speed, after calculate by the Single-Chip Microcompute, we can obtain the
information of mileage and vehicle speed. Moreover, This mileage and vehicle speed
information can be displayed by the LED monitor. And the mileage numeral of the
electronics' vehicle odometer accumulation is saving in EEPROM，which is not easily lost,
the data also can keep under the no electric appearance.
Keyword：AT89S51 Single-Chip Microcomputer；Odometer；Light sensor；LED ；Memory
