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Odometer

A technology of odometer and single-chip microcomputer, applied in the field of odometer, can solve the problem of no technical solution, and achieve the effect of reducing the probability of false clearing and reducing costs

Inactive Publication Date: 2013-05-01
TAIZHOU SHUANGYU ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] So far, there has not been a technical solution to solve the above-mentioned technical problems well

Method used

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Embodiment Construction

[0011] An object of the present invention is to provide an odometer, which can effectively reduce the probability of false reset and effectively reduce the product cost.

[0012] In the prior art, the technical solutions adopted are as figure 1 As shown, the single chip microcomputer 1 is respectively connected with the display 2 and the clearer 3 through the pins.

[0013] When the single chip microcomputer 1 needs to perform a reset operation, it will detect the status of the pins of the reset device 3, and the status of the pins is "0" or "1". , external electromagnetic interference, random state when the system is powered on, or the occurrence of line short circuit, so there will be false zeroing or misoperation, and the probability of false zeroing operation is 50%.

[0014] Further describe the technical scheme of this patent below in conjunction with accompanying drawing:

[0015] Such as figure 2 As shown, the present invention provides a kind of odometer, and desc...

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Abstract

The invention discloses an odometer, which comprises a single chip microcomputer and a display, wherein the display is connected with the single chip microcomputer through at least two base pins of the single chip microcomputer; the odometer further comprises a zero clearing device which is connected with the base pins of the single chip microcomputer; and the zero clearing device and the display multiplex the common base pins to be connected with the single chip microcomputer. According to the odometer, the base pins of the single chip microcomputer, which are connected with the zero clearing device, are increased, so that the types of a zero clearing signal can be greatly increased, and consequently the mis-zero-clearing probability is effectively reduced; and simultaneously, the zero clearing device and the display multiplex the base pins, then the probability of exclusively using the base pins to be connected with the single chip microcomputer is reduced, the single chip microcomputer with fewer base pins can be used, and the cost is effectively reduced.

Description

technical field [0001] The invention relates to the field of measuring instruments, in particular to an odometer. Background technique [0002] In order to reflect the total mileage of the motor vehicle, a speedometer is usually installed in the cab, which can record the total mileage of the vehicle. The mileage data of the vehicle is accumulated through the rotation of the wheels. [0003] At present, the odometers of automobiles on the market need to be cleared after the test run, so a pin is often drawn out on the single-chip microcomputer to control the clearing operation of the zero reset device. However, due to the occurrence of false soldering on the circuit board, external electromagnetic interference, random state when the system is powered on, or short circuit of the line, false zeroing or misoperation often occurs. [0004] So far, there has not been a technical solution for solving the above-mentioned technical problems well. Contents of the invention [0005...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C22/00
Inventor 阮献忠戈梅华吴玉成徐国成
Owner TAIZHOU SHUANGYU ELECTRONICS
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