CN104019902B - Household test paper reader device and detection method thereof - Google Patents

Abstract

The invention discloses a kind of domestic reagent paper reader device and detection method thereof, wherein this device includes sealing detection space, this sealing detection is spatially provided with active window, motor it is provided with in it, this motor is provided with the pallet for placing tested reagent paper, pallet is arranged over convex lens, and convex lens is provided above color sensor, is also arranged above secondary light source at pallet；This device also includes microprocessor, is connected with motor；Being provided with contact on pallet, pallet is also arranged above the sense contact being connected with microprocessor；This device is additionally provided with data storage, is connected with microprocessor；This sealing detection space is externally provided with liquid crystal display and button, is all connected with microprocessor.The present invention can show testing result automatically, the impact of anthropic factor during can avoiding manually reading.

Description

Household test paper reader device and detection method thereof

technical field

The invention relates to automatic detection of different test papers, in particular to a household test paper reader device and a detection method thereof.

Background technique

With the development of biochemical detection technology, the scope of test paper detection is becoming wider and wider. In addition to scientific research institutes, universities, and medical testing, more and more test paper detection methods have entered thousands of households, such as the detection of tap water (PH value , heavy metal content), pesticide residue detection, home environment detection (formaldehyde detection), human biochemical index detection (early pregnancy, blood sugar); due to the variety of test papers and different detection methods, it brings inconvenience to the detection. For the visual impairment of the elderly, etc., there is a large human error in the comparative measurement of the test paper.

With the development of color science theory and detection technology, the measurement and processing of color information is more and more widely used in industrial automation, mainly in quality control, classification and identification, etc. There are mainly spectrophotometers and photoelectric colorimeters for color measurement, and the measurement principles of the two are different. The spectrophotometer calculates the color value by measuring the spectrum of the reflected light, which has high precision but the cost is too high. The photoelectric colorimeter simulates the color perception process of the human eye and performs color measurement. The result is simple and the cost is low, such as CCD imaging Technology and color sensor, through color calculation and color recognition, according to the principle of minimum color difference, to obtain close to the human visual experience. The color sensor is used to collect the color of the test paper, and the chromaticity calculation is performed, compared with the standard test paper, and the measurement result is obtained, which has the advantages of fast and simple.

Contents of the invention

The purpose of the present invention is to realize the display and storage of test results of different types of test paper, provide a detection method and device of a household universal test paper reader, and overcome the inconvenience of traditional test paper test reading.

The technical scheme that the present invention realizes its object adopts is:

A household test paper reader device is provided, the device includes a sealed detection space, a movable window is arranged on the sealed detection space, a stepping motor is arranged in it, and a tray for placing the tested paper is arranged on the stepping motor, the tray There is a convex lens on the top, a color sensor is set above the convex lens, and an auxiliary light source is set above the tray; the device also includes a microprocessor, which is connected with the stepping motor; contacts are set on the tray, and there is also a microprocessor on the tray. Inductive contacts connected to the device; the device also has a data memory, which is connected to the microprocessor;

A liquid crystal display and buttons are arranged outside the sealed detection space, all of which are connected with the microprocessor.

In the device of the present invention, a temperature and humidity sensor is provided outside the sealed detection space, which is connected with the microprocessor.

In the device of the present invention, the movable window is a flip window.

In the device of the present invention, the microprocessor is further provided with a wireless communication module, and the upper computer or the terminal is connected with the microprocessor through the wireless communication module.

In the device of the present invention, the device is also provided with a USB interface and an external keyboard.

The present invention also provides a test paper detection method based on the above device, comprising the following steps:

White balance detection;

Select the type of paper to be tested by pressing the button, the microprocessor sends out a control command, drives the stepping motor to run, drives the tray to move out of the sealed detection space, and the stepping motor moves to the sensing contact above the tray;

Put the paper to be tested on the tray, and through key operation, the microprocessor drives the stepping motor to move the tray into the sealed detection space;

Start the auxiliary light source, the reflected light on the test paper is focused by the convex lens, enters the color sensor, and outputs the frequency signals corresponding to the RGB three colors. The hue value h of the h value is compared with the standard test paper data of the corresponding type stored in the database to obtain the measured value of the tested paper;

The measured value of the tested paper is displayed on the liquid crystal display.

In the method of the present invention, the measured value of the tested paper is transmitted to the host computer or terminal for processing through the wireless communication interface.

In the method of the present invention, also comprise step:

Select the extended mode by pressing the button, input the name of the new standard test paper, read all the grades of the standard test paper, perform color space conversion, convert RGB to HSV color space, determine the color tone of the standard test paper, determine the threshold of the judgment area, and input the corresponding The test results are stored in the standard test strip database.

In the method of the present invention, when in standby, the time, temperature and humidity are displayed by the liquid crystal display.

Using the present invention has the following beneficial effects: in the present invention, the color of the paper to be tested is collected by the color sensor, and the test result of the paper to be tested is obtained by comparing with the stored standard test paper data, which overcomes the human error in the test paper measurement, and the measured data Can be displayed and stored.

Furthermore, the types of test strips can be upgraded and expanded through on-site or remote upgrades, and the large-screen display is used, which is especially suitable for color-blind patients and elderly people with visual impairments. The device also has clock calendar, indoor temperature and humidity display functions.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is the structural diagram of the household universal test paper reader device of the embodiment of the present invention;

Fig. 2 is a schematic diagram of a pallet position detection circuit according to an embodiment of the present invention;

3 is a schematic diagram of a color sensor and a temperature and humidity detection circuit according to an embodiment of the present invention;

4 is a schematic diagram of a USB interface charging circuit according to an embodiment of the present invention;

Fig. 5 is an appearance structure diagram of a household universal test paper reader device according to an embodiment of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The household universal test paper reader device of the embodiment of the present invention, as shown in Figure 1, comprises a sealed detection space 1, a movable window is provided on the sealed detection space 1, and a stepping motor 6 is arranged in it, and a stepping motor 6 is provided on the stepping motor 6. A tray 16 for placing the paper to be tested is provided, a convex lens 3 is arranged above the tray 16, a color sensor 2 is arranged above the convex lens 3, and an auxiliary light source 4 is also arranged above the tray 16; the device also includes a microprocessor 7, and a stepper The motor 6 is connected; a contact 15 is provided on the tray 16, and the electric contact 15 can be arranged on the side of the tray 16, and an induction contact 14 connected with the microprocessor 7 is also provided above the tray 16; the device is also provided with a data memory 10 , is connected with microprocessor 7;

The sealed detection space 1 is provided with a liquid crystal display 9 and buttons, both of which are connected with the microprocessor 7 .

In the embodiment of the present invention, as shown in Figure 1, the color sensor 2, the convex lens 3, the auxiliary light source 4, the paper to be tested 5, the tray 16, the stepper motor 6, the microprocessor 7, the data memory 10 and the wireless communication module 11 It is built in the sealed detection space 1, which can overcome the influence of ambient light, and the buttons and liquid crystal display 9 are placed outside, which is convenient for operation.

In one embodiment of the present invention, the active window can be set as a flip window.

Further, the device is also provided with a USB interface and a keyboard 8 . The USB interface can be used for charging the device. When it can be extended by the external keyboard 8, the name of the test paper can be input.

The device can control the stepping motor 6 to move the tray 16 in and out of the sealed detection space 1 through the microprocessor 7, which is convenient for placing or removing the tested paper 5; the auxiliary light source 4 is used to uniformly illuminate the tested paper 5, and its reflected light passes through the convex lens 3 Concentrate on the color sensor 2 to obtain the color parameters (RGB) of the test paper; after processing, the microprocessor 7 performs the transformation of the color space, directly converts RGB to the HSV color space, determines the threshold of the judgment area according to the hue of the standard test paper, and compares it to obtain The test results of the tested paper.

The wireless communication module communicates with the upper computer, and can transmit the test structure of the tested paper to the upper computer for storage and storage through wireless communication, and transmit the expanded new standard test paper test data to the detection device through wireless communication, and upgrade the test paper. database.

The device can control the stepper motor 6 to move the tray 16 into and out of the sealing detection space 1 through the microprocessor 7, and at the same time, the contact 15 left on the side of the tray is convenient for detecting the position of the tray and fixing the final position of the tray moving out and in, as shown in Figure 2 shown.

The color sensor data of the device is processed by the microprocessor 7 to convert the color space, directly convert RGB to HSV color space, determine the threshold of the judgment area according to the hue of the standard test paper, and compare to obtain the test structure of the tested paper. Its operation method is

The color RGB values (r, g, b) of the sample collected by the color sensor represent the red, green and blue values of the color respectively. Let max and min be the maximum and minimum values of r, g and b respectively.

From RGB to HSV color space conversion, the corresponding relationship is

$\mathrm{<span\; class="notranslate">\; the\; s</span>}<span\; class="notranslate">\; =</span>\left\{\begin{array}{cc}\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; ,</span>& \mathrm{<span\; class="notranslate">\; if</span>}\mathrm{<span\; class="notranslate">\; max</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}\\ \mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; min</span>}}{\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; ,</span>& \mathrm{<span\; class="notranslate">\; otherwise</span>}\end{array}\right.$

v=max

The color values r, g, and b of the RGB model are all 0-255. According to the above formula, the HSV color space can be obtained. In the HSV (h, s, v) color model, h represents the hue, s represents the saturation, that is, the purity of the color, v represents the lightness, and h takes a value from 0 to 360 degrees, which is the hue angle. Red corresponds to 0°, green to 120° and blue to 240°. Obviously, converting the color value of the RGB model into the hue angle h can distinguish different colors. According to the RGB color value of the standard test paper test, it is converted into the hue angle h, and the corresponding relationship between the color of the standard test paper and the test paper result is converted into the hue angle h corresponding to the test paper test structure, and the comparison threshold of the standard test paper is divided accordingly, as the tested paper standard of comparison.

The test paper reader device of the present invention is also provided with a temperature and humidity sensor outside the sealed detection space, which is connected with the microprocessor 7 . A digital temperature and humidity sensor can be used, and the microprocessor 7 collects temperature and humidity information through a port connected to the temperature and humidity sensor. The temperature and humidity sensor can be installed on the back of the device, and the liquid crystal display can display the test value of the test paper. When the device is in standby, the liquid crystal display can display the calendar, time, temperature, and humidity in sequence.

In a preferred embodiment of the present invention, when the test paper is detected by the above-mentioned device, the paper to be tested is placed on the tray, and the measuring method includes the following steps:

1. Carry out white balance detection before detection, that is, the bottom layer on the tray is white paper, detect its color, and perform white balance processing;

2. Select the type of paper to be tested by pressing the button, the microprocessor sends a control command, drives the stepping motor to run, drives the tray to move out of the sealed detection space, the stepping motor moves to the sensing contact 14, and the user puts the tested paper on the tray On the top, through key operation, the microprocessor drives the stepping motor to move the tray into the sealing detection space;

3. Start the auxiliary light source, the reflected light on the test paper is focused by the convex lens, enters the color sensor, and outputs the frequency signals corresponding to the three colors of RGB, and the microprocessor collects the frequency values corresponding to RGB, and converts them into HSV (h, s, v) color model, calculate the corresponding hue value h, compare the h value with the standard test paper data of the corresponding type stored in the database, and obtain the measured value of the tested paper;

4. The measured value of the tested paper can be displayed locally, or transmitted to the host computer through wireless communication for processing.

The method for extending test paper measurement comprises the following steps:

1. Carry out white balance detection before detection, that is, the bottom layer on the tray is white paper, detect its color, and perform white balance processing;

2. Select the extended test paper function key through the button, and enter the new test paper category through the external keyboard. The microprocessor sends out a control command to drive the stepping motor to run, driving the tray to move out of the sealed space, and the stepping motor moves to the contact point 14. The user puts the standard test paper to be tested on the tray, and through key operation, the microprocessor drives the stepping motor to move the tray into the sealed space;

3. Start the auxiliary light source, the reflected light on the test paper is focused by the convex lens, enters the color sensor, and outputs the frequency signals corresponding to the three colors of RGB, and the microprocessor collects the frequency values corresponding to RGB, and converts them into HSV (h, s, v) color model, calculate the corresponding hue value h, store the h value, and input the measured value (such as concentration, content, etc.) corresponding to the standard test paper;

4. Repeatedly measure all standard test papers and store the corresponding measured values;

5. Press the button to prompt to end the test paper test, the microprocessor will calculate the threshold based on the measured tone value, assign the corresponding standard test paper measurement value, and store it in the data memory;

6. The wireless communication unit can also be used for system upgrades to expand the types of paper to be tested.

Realization of key circuits and devices

1. Tray position control

The pallet position space is controlled by two contact positions, as shown in Figure 2. When the stepping motor drives the tray to move out to the setting position, the contact of the tray touches contact 14, the signal changes from 1 to 0 to the port p1.7 of the microprocessor, and the control motor stops running; when the stepping motor drives the tray to move into the setting position position, the tray contact contacts contact 13, and the signal changes from 1 to 0 to the port p1.6 of the microprocessor to control the motor to stop running, and the pull-up resistors R1 and R2 take a value of 1kΩ.

2. Sensor circuit

As shown in Figure 3, the intelligent detection device includes a color sensor and a temperature and humidity sensor, both of which are connected to a microprocessor. Here, the color sensor is selected as TCS230, the temperature and humidity sensor is selected as SHT10, and the microprocessor is MSP430F4270. Among them, the port of TCS230 is assigned to the IO port of the microprocessor MSP430F4270 as P6.0~p6.4, the port of SHT10 is assigned to the IO port of the microprocessor MSP430F4270 as P6.6~p6.6, and the port of the liquid crystal display is assigned to the microprocessor MSP430F4270 The IO port is P2.0～p2.7, P5.0～p5.7

3. Charging circuit

The device is powered by a rechargeable battery, and the charging circuit is LTC4054-4.2V. As shown in Figure 4, the 5V voltage input by the USB is converted to 4.2V voltage, and the voltage is stepped down by a diode to obtain a voltage of 3.0V ~ 3.6V for the system Work.

4. Appearance structure diagram

The appearance structure diagram of the present invention is shown in Figure 5, which can be hung or placed on the desktop. The upper part of the panel is a liquid crystal display, the lower part is a key operation area, and the side is a tray access port. A flip window can also be set up under the panel to directly insert the tested paper. The temperature and humidity sensor is placed on the back, and the test value of the test paper is displayed on the liquid crystal display, and the calendar, time, temperature, and humidity are displayed in sequence when the device is in standby mode. It is in a low power consumption mode when it is in standby mode, and the working power supply is powered by a rechargeable battery.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present invention.

Claims (9)

1. A household test paper reader device, characterized in that the device comprises a sealed detection space, the sealed detection space is provided with a movable window, and a stepping motor is provided in it, and the stepping motor is provided with a window for placing the tested window. The paper tray is provided with a convex lens above the tray, a color sensor is arranged above the convex lens, and an auxiliary light source is provided above the tray; the device also includes a microprocessor connected with a stepping motor; There is an inductive contact connected with the microprocessor; the device also has a data memory connected with the microprocessor; A liquid crystal display and buttons are arranged outside the sealed detection space, all of which are connected with the microprocessor. 2. The device according to claim 1, characterized in that a temperature and humidity sensor is provided outside the sealing detection space, which is connected to the microprocessor. 3. The device according to claim 1, wherein the movable window is a flip window. 4. The device according to claim 1, characterized in that, the microprocessor is also provided with a wireless communication module, and the host computer or terminal is connected to the microprocessor through the wireless communication module. 5. The device according to claim 1, characterized in that, the device is also provided with a USB interface and an external keyboard. 6. a test paper detection method based on claim 1, is characterized in that, comprises the following steps: White balance detection; Select the type of paper to be tested by pressing the button, the microprocessor sends out a control command, drives the stepping motor to run, drives the tray to move out of the sealed detection space, and the stepping motor moves to the sensing contact above the tray; Put the paper to be tested on the tray, and through key operation, the microprocessor drives the stepping motor to move the tray into the sealed detection space; Start the auxiliary light source, the reflected light on the test paper is focused by the convex lens, enters the color sensor, and outputs the frequency signals corresponding to the RGB three colors. The hue value h of the h value is compared with the standard test paper data of the corresponding type stored in the database to obtain the measured value of the tested paper; The measured value of the tested paper is displayed on the liquid crystal display. 7. The method according to claim 6, characterized in that the measured value of the tested paper is transmitted to a host computer or a terminal for processing through a wireless communication interface. 8. The method according to claim 6, further comprising the steps of: Select the extended mode by pressing the button, input the name of the new standard test paper, read all the grades of the standard test paper, perform color space conversion, convert RGB to HSV color space, determine the color tone of the standard test paper, determine the threshold of the judgment area, and input the corresponding The test results are stored in the standard test strip database. 9. The method according to claim 6, characterized in that, when the device is in standby, the time, temperature and humidity are displayed on a liquid crystal display.