CN2335125Y - Direct reading type liquid crystal display level bar - Google Patents

Abstract

The utility model relates to a direct-reading liquid crystal display level bar, which is an electronic inclination measuring instrument for the building industry. The level ruler consists of an electronic tilt angle sensor, a compensation amplifying circuit, an analog-to-digital conversion circuit, a display circuit and a power supply circuit. The electronic tilt sensor outputs voltage signals of the size and direction of the tilt angle, and the voltage signals are processed by a subsequent electronic circuit to push the liquid crystal display, and the liquid crystal display displays the direction and the size of the tilt angle according to the sign and the numerical value. The utility model relates to a simple structure, convenient to use, measurement reliability are high, directly perceived easy-to-read, for the level bar that is very practical on the building.

Description

Direct-reading liquid crystal display surveyor's staff

The utility model belongs to a kind of electronics deviational survey instrument.

Surveyor's staff is the most basic and indispensable instrument of building industry always, and traditional surveyor's staff all is the principle with bubble, and it uses and carries all inconveniences, and can only measure whether level is with vertical, can't measure concrete angle.Along with developing rapidly of modern architecture level, traditional bubble level chi can not satisfy the requirement of modern architecture.

The electronic horizontal ruler that provides a kind of employing to be made up of electric slope angle sensor and microelectronic circuits is provided the purpose of this utility model, it shows level angle intuitively with liquid crystal, anyone can both measure the angle of tested surface and surface level exactly with it, electronic horizontal ruler can not only substitute traditional bubble level chi, can also carry out the measurement of the various gradients.

The purpose of this utility model can be finished by the following technical programs:

This tiltmeter is formed the circuit block diagram referring to Fig. 1 by five parts on line construction, 1 is that electric slope angle sensor, 2 is that analog to digital conversion circuit, 4 is that display circuit, 5 is power supply circuit for compensating amplifying circuit, 3.

Specifically, electric slope angle sensor is transformed into a voltage signal output with the inclination angle size and Orientation, after amplifying, the compensation amplifying circuit is defeated by analog to digital conversion circuit, the latter is because inside has seven-segment decoder and display driver, so be enough to promote LCDs from the signal of analog to digital conversion circuit output, at last signal shown also and can represent vergence direction with sign with numeral.

Below engage description of drawings embodiment:

Select the low and obliquity sensor of precision more than 1 position is close of price, it is connected with the compensation amplifying circuit.

Be illustrated in figure 3 as the utility model compensation amplification circuit diagram.Adopt operational amplifier LF411 to compensate amplifying circuit as this, sensor input signal is imported from Vin, and the bucking voltage of the adjustable positive voltage adjuster output of three ends is from the input of Va end.The zero-bit adjustment of electronic horizontal ruler is definite by the bucking voltage Va of LM317 output, and inputs to the compensation amplifying circuit, and R2 adjusts the scale-up factor of sensor output, makes it to meet the requirement of follow-up analog to digital conversion circuit.Output terminal V ₀Directly link the analog to digital conversion of Fig. 4 and the input end 2 of display circuit, so that go out the inclination angle value from the liquid crystal display direct-reading.

Fig. 4 is analog to digital conversion of the present utility model and display circuit.Input to the ICL7106AD converter through the voltage signal after the compensation amplification of front, because this chip internal has seven-segment decoder and display driver, therefore its output can directly drive three and half LCDs, thereby can directly read the size and Orientation at inclination angle.

Fig. 2 is the utility model feed circuit, adopt 9V packed cell K1 power supply, battery electrode is buckled with circuit board by battery and is linked to each other, at first input to three-terminal voltage-stabilizing power supply LM7800, obtain the required positive voltage output of circuit, this voltage is divided into two-way, one the tunnel gives the adjustable positive voltage adjuster of three ends LM317, obtain amplifying the required voltage of compensation by choose reasonable adjustment end resistance R 1, the input end of CMOS negative supply transducer ICL7660 is delivered on another road, can finish electric power polarity from just to negative conversion, thereby obtain the negative voltage of symmetry.

The utility model advantage:

1, simple in structure, easy to use:

2, measure the reliability height, readability directly perceived.

Description of drawings:

Fig. 1 is the utility model frame circuit diagram

Fig. 2 is power supply circuit figure

Fig. 3 is the compensation amplification circuit diagram

Fig. 4 is analog to digital conversion and display circuit figure

Claims (1)

1, a kind of direct-reading liquid crystal display surveyor's staff is made up of electric slope angle sensor, compensation amplifying circuit, analog to digital conversion circuit, display circuit and power supply circuit, it is characterized in that:

(1) electric slope angle sensor is connected with the compensation amplifying circuit;

(2) the compensation amplifying circuit links to each other with analog to digital conversion circuit and presses,

Be processed into and directly promote LCDs through above (1), (2) two voltage signals that go on foot electric slope angle sensors.

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