CN102564537A - A method of weighing using a mobile terminal device - Google Patents

Abstract

The invention relates to a method for weighing by using a mobile terminal device, which comprises the following steps: placing an object to be measured on a screen of a mobile terminal device; acquiring contact resistance R of X resistance surface (2) and Y resistance surface (3) of screen through sensor module of mobile terminal device_touch(4) (ii) a Obtaining an object weight m through a data processing module of the mobile terminal device; optionally, expressing the weight of the object obtained; the screen is a resistance type touch screen. The invention realizes the weighing of the object without increasing the cost and increases the functions of the mobile terminal device.

Description

A method of weighing using a mobile terminal device

technical field

The invention relates to a weighing method using a mobile terminal device, in particular to a weighing method using a screen of the mobile terminal device.

Background technique

Current mobile terminal products have various functions, for example, call function, short message function, Internet access function, etc., and even a weighing function.

For example, the patent application No. 200510086807.2 discloses a mobile phone that can realize the function of an electronic scale, including an analog-to-digital conversion processing unit, a CPU processing unit, a signal output device, a pressure sensor and an amplification unit; The pressure sensor is arranged in the lanyard hole.

As another example, the patent application No. 200920135320.2 discloses a weighing mobile phone, which includes a weight sensing unit, a data processing unit and a display unit. The weight sensing unit includes a hook module, a sensing support module and a connection module.

For another example, the patent application No. 200510030953.3 discloses a mobile phone capable of measuring weight, including a panel and a display screen, and a sensor for measuring the weight of an object is arranged in the panel, one end of which is connected with the sensor for measuring the weight of an object, and the other A weighing structure with one end connected to the measured object, the sensor for measuring the weight of the object displays the result on the display screen through signal processing in the panel.

In the prior art, a weighing structure such as a hook is set on the mobile phone, and the weighing function is realized through a pressure-sensitive sensor, which will increase the manufacturing cost.

Contents of the invention

The inventor of the present application found another way to realize the weighing function through the resistive touch screen of the mobile terminal device itself.

An object of the present invention is to provide a method of weighing using a mobile terminal device, comprising the following steps:

1) Place the object to be measured on the screen of the mobile terminal device;

2) Obtain the contact resistance R _touch of the screen through the sensor module of the mobile terminal device;

3) Obtain the object weight m according to the following relational formula through the data processing module of the mobile terminal device;

$\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; \&Proportional;</span>\frac{\mathrm{<span\; class="notranslate">\; S</span>}}{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; touch</span>}}$

In the above formula, S is the contact area between the object and the screen, the unit is m ² , and g is the acceleration of gravity;

4) Optionally, express the obtained object weight.

According to the method of the present invention, preferably, the screen is a resistive touch screen.

According to the method of the present invention, preferably, in step 3), the contact area S between the object and the resistive touch screen is divided into n gears S ₁ , S ₂ . . . S _n-1 , S _n , n is a natural number, and the corresponding relationship between the object weight m and the contact resistance R _touch under the contact area of different gears is obtained. Preferably, under the contact area conditions of different gears, the corresponding relationship between the weight m of objects of different groups and the contact resistance R _touch is obtained through calibration.

According to the method of the present invention, the resistive touch screen is preferably a four-wire touch screen, a five-wire touch screen, a seven-wire touch screen, or an eight-wire touch screen.

According to the method of the present invention, the resistive touch screen is preferably a four-wire touch screen.

According to the method of the present invention, preferably, the contact resistance R _touch is the contact resistance R _touch between the X resistance surface and the Y resistance surface of the resistive touch screen.

According to the method of the present invention, preferably, the R _touch is obtained according to an ADC sampling method.

According to the method of the present invention, preferably, the ADC sampling method includes the following steps:

(1) Obtain the X-axis coordinate value, that is, X+ plus power supply, X-ground, Y+ sampling, obtain the X-axis coordinate value X _position ;

(2) Obtain the voltage value of Z1, that is, Y+ is powered, X- is grounded, X+ is sampled, and the voltage value Z1 is obtained;

(3) Obtain the Z2 voltage value, that is, Y+ plus power supply, X- ground, Y- sampling, and obtain the voltage value Z2;

(4) Obtain R _touch by the following formula

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; touch</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; plane</span>}}<span\; class="notranslate">\; \&times;</span>\frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="position"\; filenames="HDA0000122109900000021.png"\; state="\{\{state\}\}">position</figure-callout></span>}}}{{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

In the formula, R _x-plane represents the resistance value of the X resistance plane, which is a known quantity; n represents the number of ADC sampling bits of the resistive touch screen driver IC.

According to the method of the present invention, preferably, the number of ADC sampling bits is 12 bits.

According to the method of the present invention, preferably, the mobile terminal device is a mobile phone, an MP4 player, a notebook computer, a vehicle computer or a tablet computer.

According to the method of the present invention, more preferably, the mobile terminal device is a mobile phone.

The invention can realize the weighing of the weight of the object by using the resistive touch screen, realizes the weighing of the object without increasing the cost, and increases the function of the mobile terminal device.

Description of drawings

Fig. 1 is the measurement circuit schematic diagram of X-axis coordinate value;

Fig. 2 is the measurement circuit schematic diagram of Z1 voltage value;

Fig. 3 is the measurement circuit schematic diagram of Z2 voltage value;

FIG. 4 is a schematic diagram of the weighing state of the mobile terminal device in Embodiment 1. FIG.

Fig. 5 is the weighing flowchart of embodiment 1.

Reference signs are specified as follows:

1. Touch the part;

2. X resistance surface;

3. Y resistance surface;

4. Contact resistance.

Detailed ways

The present invention will be further described below in conjunction with the specific embodiments of the accompanying drawings, but the protection scope of the present invention is not limited thereto.

The invention realizes the weighing function through the resistive touch screen of the mobile terminal equipment itself. The "mobile terminal equipment" of the present invention is a broad sense of "mobile terminal equipment", including mobile phones, notebook computers, tablet computers, MP4 players, vehicle-mounted computers, and the like. The "mobile terminal device" of the present invention is preferably a mobile phone or a tablet computer, more preferably a mobile phone.

The mobile terminal device of the present invention includes a data processing module, a sensor module and the like. The data processing module of the present invention may be the CPU of the mobile terminal device, or an independent module different from the CPU; preferably the CPU of the mobile terminal device. The sensor module of the present invention preferably includes a resistive touch screen and its associated components. These related components are well known to those skilled in the art.

The "resistive touch screen" of the present invention is a sensor that converts the physical position of a touch point (X, Y) in a rectangular area into a voltage representing the X and Y coordinates. Many liquid crystal (LCD) modules and LED (light-emitting diode display) modules use resistive touch screens. This kind of screen can use four, five, seven or eight wires to generate screen bias voltage and read back the touch point at the same time. Voltage.

The resistive touch screen of the present invention can be a composite structure of film and film, a composite structure of glass and glass, or a composite structure of film and glass, preferably a composite structure of film and glass. The adjacent surfaces of the film and the glass are coated with, for example, ITO (indium tin oxide) coating, and ITO has good conductivity and transparency. The usual working mode of a resistive touch screen is as follows: When a touch operation is performed, the ITO on the lower layer of the film will touch the ITO on the upper layer of the glass, and the corresponding electrical signal will be transmitted through the sensor, sent to the processor through the conversion circuit, and converted into the ITO on the screen through calculation. The X and Y values of the screen are selected to complete the action of clicking and present on the screen.

The resistive touch screen of the present invention may be a four-wire touch screen, a five-wire touch screen, a seven-wire touch screen, or an eight-wire touch screen. Four-wire and eight-wire touchscreens consist of two layers of transparent material with the same surface resistance, and five-wire and seven-wire touchscreens consist of a resistive layer and a conductive layer, usually with an elastic material separating the two layers. When sufficient pressure is exerted on the surface of the touch screen, such as by the tip of a stylus or a finger, contact occurs between the top layer and the bottom layer. All resistive touch screens generally use a voltage divider principle to generate voltages representing the X and Y coordinates.

The following takes the four-wire touch screen as an example to illustrate the working method of the touch screen. Four-wire touchscreens consist of two resistive layers, one with a vertical bus on the left and right edges of the screen and one with horizontal buses at the bottom and top of the screen. To measure in the X-axis direction, bias the left bus to 0V and the right bus to VREF. Connect the top or bottom bus to the ADC and make a measurement when the top and bottom layers touch. To measure in the Y-axis direction, bias the top bus at VREF and the bottom bus at 0V. Connect the ADC input to the left or right bus, and measure the voltage when the top layer meets the bottom layer.

The following uses a four-wire touch screen as an example to illustrate the weighing method of the present invention, and other resistive touch screens are similar.

1) Place the object to be tested on the contact portion 1 of the screen of the mobile terminal device. How objects are placed depends on the shape of the object and the size of the screen. Preferably, at least one face of the object is accommodated within the screen. If the surface of the object with the largest area can be accommodated in the screen, it is preferable to contact the screen with this surface, so as to improve the measurement accuracy. If even the smallest surface of the object cannot fit on the screen, helper objects can be used. The total weight W1 of the object to be measured and the auxiliary object and the weight W2 of the auxiliary object are respectively measured, and the weight of the object to be measured is obtained through W1-W2.

Preferably, the area of the surface of the object to be measured in contact with the screen is 1-99%, more preferably 5-95%, and most preferably 10-90% of the screen area. In this way, the object to be measured can be prevented from being in contact with the shell (at the outer edge of the screen) of the mobile terminal device, so as to ensure the accuracy of weighing.

2) Obtain the contact resistance 4 (R _touch ) between the X resistive surface 2 and the Y resistive surface 3 of the resistive touch screen. The R _touch value is obtained according to the ADC sampling method (see Figure 1-3). When the X resistance surface 2 is in contact with the Y resistance surface 3 (see Figure 4), firstly, take the X-axis coordinate value, that is, X+ is powered, X- is grounded, Y+ is sampled, and the X-axis coordinate value X _position is obtained. Secondly, take the voltage value of Z1, that is, Y+ plus power supply, X- ground, X+ sampling to obtain the voltage value Z1; finally, take the Z2 voltage value, that is, Y+ plus power supply, X- ground, Y- sampling to obtain the voltage value Z2. According to the above parameters, R _touch can be obtained through formula (1).

$R_{\mathrm{touch}}=R_{x-\mathrm{plane}}\&times;\frac{{\mathrm{<figure-callout\; id="2"\; label="x\; position"\; filenames="HDA0000122109900000021.png"\; state="\{\{state\}\}">x</figure-callout>}}_{\mathrm{position}}}{2^{\mathrm{no}}}(\frac{Z_2}{Z_1}-1)$ Formula 1)

In the formula, R _x-plane represents the surface resistance value of the X resistance surface, which is a known quantity; n represents the number of ADC sampling bits of the resistive touch screen driver IC. For example, if the ADC sampling number of the driving IC is 12 bits, then n=12, 2 ⁿ =4096.

3) Obtain the object weight m through the data processing module of the mobile terminal device. Assuming that an object with a weight of m is placed on the screen (see Figure 4), if the contact area between the object and the screen is S, then the pressure P generated by it is:

$P=\frac{f}{S}=\frac{\mathrm{mg}}{S}$ Formula (2)

The size of the pressure P is proportional to the contact resistance R _touch , that is:

P∝R _touch type(3)

According to formula (2) and formula (3), the relationship between object weight m and contact resistance R _touch can be obtained:

$m\&Proportional;\frac{S}{g}{R}_{\mathrm{touch}}$ Formula (4)

Equation (4) shows that the object weight m is proportional to the contact area S and the contact resistance R _touch .

Due to the existence of two variable parameters S and R _touch , the difficulty of implementing the scheme is increased to a certain extent. For this reason, the contact area S is quantified, that is, the contact area S is divided into n gears S ₁ , S ₂ ... S _n-1 , S _n (n is a natural number), under different gear contact area conditions, The corresponding numerical relationship between the object weight m of different groups and the contact resistance R _touch is obtained through calibration. When the user actually tests the weight of the object, it prompts to select the appropriate contact area, which not only solves the problem of uncertain contact area between the object and the resistive screen, but also reduces the measurement error to a certain extent.

4) According to the method of the present invention, optionally, the weight of the obtained object is expressed. The weight of the object can be displayed on the screen or expressed by voice.

Example 1

Refer to Figure 5 for the weighing process of Example 1. The user turns on the weight test function module of the mobile phone. The user selects the appropriate contact area S _n according to the prompts, and places the object to be tested (see Table 1) on the resistive touch screen. Due to the effect of gravity, the resistive touch screen will generate an interruption. The method is used to sample the value to obtain the contact resistance R _touch , and the data processing module converts the contact resistance R _touch into the weight of the object to be measured, and displays the measured result on the screen.

Table 1

object to be tested Actual weight (grams) Test weight (g) apple 220 209 cup 100 95 metal block 2358 2240

The present invention is not limited to the above-mentioned embodiments. Without departing from the essence of the present invention, any deformation, improvement, and replacement conceivable by those skilled in the art fall within the scope of the present invention.

Claims (10)

1. a method of using mobile terminal apparatus to weigh comprises the steps:

1) object to be measured is placed on the screen of mobile terminal apparatus;

2) obtain the contact resistance R of screen through the sensor assembly of mobile terminal apparatus _Touch

3) data processing module through mobile terminal apparatus obtains weight of object m according to following relational expression;

$m\&Proportional;\frac{S}{g}{R}_{\mathrm{touch}}$

In the following formula, S is that contact area, the unit of object and screen is m ², g is an acceleration of gravity;

4) randomly, the weight of object that is obtained is expressed;

Described screen is a resistive touch screen.

2. method according to claim 1 is divided into n gear S with contact area S in the step 3) ₁, S ₂... S _N-1, S _n, n is natural number, obtains weight of object m and contact resistance R under the contact area of different gears _TouchBetween corresponding relation.

3. method according to claim 1 and 2, described resistive touch screen are four line touch-screens, five line touch-screens, seven line touch-screens or eight line touch-screens.

4. method according to claim 1 and 2, described resistive touch screen are four line touch-screens.

5. method according to claim 1 and 2, described contact resistance R _TouchBe the X resistance face of resistive touch screen and the contact resistance R between the Y resistance face _Touch

6. method according to claim 1 and 2, described R _TouchObtain according to the ADC sample mode.

7. method according to claim 6, described ADC sample mode comprises the steps:

(1) obtain X axial coordinate value, promptly X+ adds power supply, X-ground connection, and the Y+ sampling obtains X axial coordinate value X _Position

(2) obtain the Z1 magnitude of voltage, promptly Y+ adds power supply, X-ground connection, and the X+ sampling obtains magnitude of voltage Z1;

(3) obtain the Z2 magnitude of voltage, promptly Y+ adds power supply, X-ground connection, and the Y-sampling obtains magnitude of voltage Z2;

(4) obtain R through following formula _Touch

$R_{\mathrm{touch}}=R_{x-\mathrm{plane}}\&times;\frac{X_{\mathrm{position}}}{2^n}(\frac{Z_2}{Z_1}-1)$

In the formula, R _X-planeThe resistance value of expression X resistance face is known quantity; N representes the ADC sampling resolution of resistive touch screen drive IC.

8. method according to claim 7, described ADC sampling resolution is 12bit.

9. method according to claim 1 and 2, described mobile terminal apparatus are mobile phone, MP4 player, notebook computer, vehicle-mounted computer or panel computer.

10. method according to claim 9, described mobile terminal apparatus are mobile phone.

Images