CN213309703U - Skin moisture detection system - Google Patents
Skin moisture detection system Download PDFInfo
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- CN213309703U CN213309703U CN202021729909.8U CN202021729909U CN213309703U CN 213309703 U CN213309703 U CN 213309703U CN 202021729909 U CN202021729909 U CN 202021729909U CN 213309703 U CN213309703 U CN 213309703U
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Abstract
The utility model relates to a skin moisture detecting system, including MCU control circuit, impedance measurement circuit, display screen, on-off control circuit and power supply circuit, MCU control circuit links to each other with impedance measurement circuit, display screen, on-off control circuit respectively, and MCU control circuit adopts BH66F71662 control chip, and BH66F71662 control chip internal integration has bluetooth circuit, impedance processing circuit and ADC circuit, and bluetooth circuit is used for carrying out data transmission with external terminal equipment; the impedance measuring circuit includes a metal probe D1, a metal probe D1 for making contact with the skin surface of the human body at the time of measurement. The method adopts a bioelectrical impedance method, measures through sine wave alternating current signals, calculates the AD values of two reference resistors according to a two-point calibration method to obtain the skin impedance value, and has short measuring time and stable data; meanwhile, the system uploads the measurement data to the terminal equipment through a Bluetooth circuit in a BH66F71662 control chip, a large amount of data can be stored, and a user can directly check the data change of the skin in the past conveniently.
Description
Technical Field
The utility model relates to a detect technical field, especially relate to a skin moisture content detecting system.
Background
The skin moisture detection system is widely applied to the field of beauty instruments, and generally, the skin moisture detection system adopts an RC (resistance capacitance) charging and discharging circuit and an MCU (microprogrammed control unit) control circuit, wherein the RC charging and discharging circuit is used for measuring the impedance of the skin, and the MCU control circuit is used for calculating the current moisture value of the skin of a human body according to the measured impedance value of the skin. However, the skin moisture detection system using the RC charge and discharge circuit has the problems of long time for measuring skin moisture, poor measurement repeatability, and small amount of local storage data.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a skin moisture content detecting system that measuring time is short, repeated measurement stability is high, can store a large amount of data.
For realizing the purpose of the utility model, the utility model adopts the following technical scheme:
a skin moisture detection system comprises a carrier, wherein an MCU control circuit, an impedance measurement circuit, a display screen, a switch control circuit and a power circuit are arranged on the carrier, the MCU control circuit is respectively connected with the impedance measurement circuit, the display screen and the switch control circuit, the power circuit is used for supplying power to the MCU control circuit, wherein,
the MCU control circuit adopts a BH66F71662 control chip, a Bluetooth circuit, an impedance processing circuit and an ADC circuit are integrated in the BH66F71662 control chip, and the Bluetooth circuit is used for carrying out data transmission with external terminal equipment;
the impedance measuring circuit comprises a metal probe, a first resistor, a second resistor, a third resistor and a first capacitor, wherein the metal probe is used for being in contact with the skin surface of a human body when skin moisture is measured, one end of the metal probe is respectively connected with an FVR pin and an FIR pin of a BH66F71662 control chip, the other end of the metal probe is respectively connected with one end of the first resistor, one end of the second resistor, a FIL pin of the BH66F71662 control chip, an FVL pin of the BH66F71662 control chip and one end of the third resistor, the other end of the first resistor is connected with an RF2 pin of the BH66F71662 control chip, the other end of the second resistor is connected with an RF1 pin of the BH66F71662 control chip, and the other end of the third resistor is connected with an SIN pin of the BH66F71662 control chip through the first capacitor;
the switch control circuit comprises a first switch and a second switch, the first switch is used for controlling the starting and the shutdown of the skin moisture detection system, and the second switch is used for controlling the starting and the shutdown of the impedance measurement circuit.
Compared with the traditional RC charge-discharge circuit for measuring skin impedance, the skin moisture detection system provided by the application adopts a bioelectrical impedance method, measures through sine wave alternating current signals, calculates the skin impedance of a human body according to the AD values of two measured resistors by a traditional two-point calibration method, and is short in measurement time and stable in data; the BH66F71662 control chip calculates to obtain a corresponding skin data result according to the corresponding relation between the impedance and the moisture, oil and elasticity, and transmits the result to the terminal equipment through a Bluetooth circuit in the BH66F71662 control chip, so that a large amount of data can be stored, and a user can directly check the change of the skin data in the past.
In one embodiment, the power circuit includes a battery circuit and a USB interface charging circuit, wherein,
the battery circuit comprises a battery, an HT7533-7 voltage stabilizing chip, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor, wherein an IN pin of the HT7533-7 voltage stabilizing chip is respectively connected with the battery, one end of the second capacitor and one end of the third capacitor, an OUT pin of the HT7533-7 voltage stabilizing chip is respectively connected with one end of the fourth capacitor, one end of the fifth capacitor and a VDD pin of the BH66F71662 control chip, and a GND pin of the HT7533-7 voltage stabilizing chip, the other end of the second capacitor, the other end of the third capacitor, the other end of the fourth capacitor and the other end of the fifth capacitor are all grounded;
the USB interface charging circuit comprises a TP4057 charging management chip, a USB interface, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor and a fourth capacitorA resistor, the TP4057 charge management chip
One end of the pin is connected with one end of the sixth capacitor, the BAT pin of the TP4057 charging management chip is respectively connected with one end of the battery and one end of the seventh capacitor, the PROG pin of the TP4057 charging management chip is connected with one end of the fourth resistor, and the TP4057 charging management chip
The foot with the one end of eighth electric capacity links to each other, TP4057 charge management chip's VCC foot respectively with the USB interface the one end of ninth electric capacity links to each other, TP4057 charge management chip's GND foot the other end of sixth electric capacity the other end of seventh electric capacity the other end of eighth electric capacity the other end of ninth electric capacity with the other end of fourth resistance all grounds.
In one embodiment, the carrier is further provided with a battery detection circuit, the battery detection circuit includes a fifth resistor, a sixth resistor and a tenth capacitor, one end of the fifth resistor is connected to the battery, the other end of the fifth resistor is respectively connected to the lvdn pin of the BH66F71662 control chip, one end of the sixth resistor and one end of the tenth capacitor, and the other end of the sixth resistor and the other end of the tenth capacitor are grounded.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a skin moisture detection system;
FIG. 2 is a graph showing the relationship between the skin impedance and the moisture content of the human body in this embodiment;
fig. 3 is a graph showing the relationship between the skin impedance and the oil content of the human body in this embodiment.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. In the description of the present invention, "a plurality" means at least one, e.g., one, two, etc., unless specifically limited otherwise.
Referring to fig. 1, this embodiment provides a skin moisture detecting system, which comprises a carrier, be equipped with MCU control circuit on the carrier, impedance measurement circuit, display screen U2, switch control circuit and power supply circuit, MCU control circuit respectively with impedance measurement circuit, display screen U2, switch control circuit links to each other, power supply circuit is used for supplying power for MCU control circuit, wherein, MCU control circuit adopts BH66F71662 control chip U1, inside integrated bluetooth circuit, impedance processing circuit and the ADC circuit of BH66F71662 control chip U1, bluetooth circuit is used for carrying out data transmission with external terminal equipment.
The impedance measuring circuit comprises a metal probe D1, a first resistor R4, a second resistor R3, a third resistor R2 and a first capacitor C3, wherein the metal probe D1 is used for being in contact with the skin surface of a human body when skin moisture measurement is carried out, one end of the metal probe D1 is connected with an FVR pin and an FIR pin of a BH66F71662 control chip U1 respectively, the other end of the metal probe D1 is connected with one end of the first resistor R4, one end of the second resistor R3, a FIL pin of the BH66F71662 control chip U1, an FVL pin of the BH66F71662 control chip U1 and one end of the third resistor R2 respectively, the other end of the first resistor R4 is connected with an RF2 pin of the BH66F71662 control chip U1, the other end of the second resistor R3 is connected with an RF1 pin of the BH66F71662 control chip U1, and the other end of the third resistor R2 is connected with an SIN pin 686 of the BH66F71662 control chip U686 through a C7128.
The switch control circuit comprises a first switch KEY1 and a second switch KEY2, one end of the first switch KEY1 is connected with a PA3 pin of a BH66F71662 control chip U1, one end of the second switch KEY2 is connected with a PA0 pin of a BH66F71662 control chip U1, and the other end of the first switch KEY1 and the other end of the second switch KEY2 are grounded. The first switch KEY1 is used for controlling the power-on and power-off of the skin moisture detection system, and the second switch KEY2 is used for controlling the on and off of the impedance measurement circuit.
Specifically, the power circuit may include a battery circuit and a USB interface charging circuit, wherein the battery circuit includes a battery BAT, an HT7533-7 regulator chip, a second capacitor C11, a third capacitor C12, a fourth capacitor C4, and a fifth capacitor C5, an IN pin of the HT7533-7 regulator chip is connected to one end of the battery BAT, the second capacitor C11, and one end of the third capacitor C12, respectively, an OUT pin of the HT7533-7 regulator chip is connected to one end of the fourth capacitor C4, one end of the fifth capacitor C5, and a VDD pin of the BH66F71662 control chip U1, and a GND pin of the HT7533-7 regulator chip, the other end of the second capacitor C11, the other end of the third capacitor C12, the other end of the fourth capacitor C4, and the other end of the fifth capacitor C5 are all grounded.
The USB interface charging circuit comprises a TP4057 charging management chip, a USB interface, a sixth capacitor C10, a seventh capacitor C9, an eighth capacitor C13, a ninth capacitor C8, a fourth resistor R7 and a charging management chip of the TP4057
One end of the pin is connected with one end of a sixth capacitor C10, the BAT pin of the TP4057 charging management chip is respectively connected with the BAT battery and one end of a seventh capacitor C9, the PROG pin of the TP4057 charging management chip is connected with one end of a fourth resistor R7, and the TP4057 charging management chip
The pin is connected with one end of an eighth capacitor C13, the VCC pin of the TP4057 charging management chip is connected with the USB interface and one end of a ninth capacitor C8, respectively, and the GND pin of the TP4057 charging management chip, the other end of a sixth capacitor C10, the other end of a seventh capacitor C9, the other end of an eighth capacitor C13, the other end of a ninth capacitor C8 and the other end of a fourth resistor R7 are all grounded.
Further, a battery detection circuit can be further arranged on the carrier, the battery detection circuit comprises a fifth resistor R5, a sixth resistor R6 and a tenth capacitor C7, one end of the fifth resistor R5 is connected with the battery BAT, the other end of the fifth resistor R5 is respectively connected with the LVDIN pin of the BH66F71662 control chip, one end of the sixth resistor R6 and one end of the tenth capacitor C7, and the other end of the sixth resistor R6 and the other end of the tenth capacitor C7 are grounded.
In this embodiment, the power circuit includes a battery circuit and a USB interface charging circuit, and when the battery BAT in the battery circuit is insufficient or dead, the user can charge the USB interface connection socket, the charger, the computer, etc. provided in the USB interface charging circuit.
In the embodiment, the impedance measuring circuit is used for measuring the impedance value of human skin; the MCU control circuit is used for calculating the moisture content (water content) of the human skin according to the impedance value measured by the impedance measuring circuit and also calculating the oil content and the elasticity value of the human skin. Specifically, this MCU control circuit adopts BH66F71662 control chip U1, BH66F71662 control chip U1 internal integration has bluetooth Beacon broadcasting circuit, impedance processing circuit and 24-bit ADC circuit, adopt this control chip only need a small amount of peripheral components can calculate human skin moisture content, adopt this control chip simultaneously and need not to increase extra bluetooth module can with the direct upload to external terminal equipment of calculated result on, specifically can be on the APP of cell-phone, so that the user carries out the contrast observation to the skin moisture content situation of change in own a period.
The working principle of the skin moisture detection system provided by the embodiment for detecting skin moisture is as follows:
in the embodiment, the impedance value of human skin is measured by adopting a bioelectrical impedance technology commonly used by technicians in the field, namely, a sine wave alternating current signal with the frequency of 3.3KHz is output by an SIN pin of a control chip U1 of BH66F71662, and a high input impedance operational amplifier is arranged in the control chip, so that an impedance measuring circuit is a constant current circuit; software adjusts BH66F71662 to control an internal switch of a chip U1, so that current flows from an SIN pin through a first resistor R4, and an ADC circuit measures the AD value of the first resistor R4; after the measurement is finished, the AD value of the second resistor R3 is measured in the same way; finally, the AD value of the metal probe D1 was measured. Knowing the actual impedance and the AD value of the first resistor R4 and the second resistor R3, the current impedance value of the human skin can be calculated from the AD value of the metal probe D1 according to the conventional two-point calibration method.
After impedance measurement succeeds, calculating skin moisture content and oil content according to the measured impedance value by the BH66F71662 control chip U1, calculating elasticity according to skin impedance and skin moisture, and calculating skin score according to impedance, moisture, oil content and elasticity, wherein the specific calculation method is to calculate by using a corresponding relation formula of the impedance value, the moisture, the oil content and the elasticity, which is commonly used by a person skilled in the art, and the specific corresponding relation formula refers to fig. 2 and fig. 3; the BH66F71662 control chip U1 correspondingly displays the calculated skin data (skin moisture, oil content, elasticity value and skin score) through the display screen U2, and meanwhile, the skin data can be directly uploaded to external terminal equipment through a Bluetooth circuit inside the BH66F71662 control chip U1, specifically, a mobile phone of a user can be used, and the user can check the change of past measurement data through a specific APP on the mobile phone.
Compared with the traditional RC charge-discharge circuit for measuring skin impedance, the skin moisture detection system provided by the embodiment adopts a bioelectrical impedance method, measures through sine wave alternating current signals, calculates the AD values of two measured resistors according to the traditional two-point calibration method to obtain the skin impedance of a human body, and has short measurement time and stable data; the BH66F71662 control chip U1 calculates according to the corresponding relation of impedance, moisture, oil and elasticity to obtain a corresponding skin data result, and uploads the result to the terminal equipment through a Bluetooth circuit inside the BH66F71662 control chip U1, so that a large amount of data can be stored, and a user can directly check the change of the skin data in the past conveniently.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (3)
1. A skin moisture detection system is characterized by comprising a carrier, wherein an MCU control circuit, an impedance measurement circuit, a display screen, a switch control circuit and a power circuit are arranged on the carrier, the MCU control circuit is respectively connected with the impedance measurement circuit, the display screen and the switch control circuit, the power circuit is used for supplying power to the MCU control circuit, wherein,
the MCU control circuit adopts a BH66F71662 control chip, a Bluetooth circuit, an impedance processing circuit and an ADC circuit are integrated in the BH66F71662 control chip, and the Bluetooth circuit is used for carrying out data transmission with external terminal equipment;
the impedance measuring circuit comprises a metal probe, a first resistor, a second resistor, a third resistor and a first capacitor, wherein the metal probe is used for being in contact with the skin surface of a human body when skin moisture is measured, one end of the metal probe is respectively connected with an FVR pin and an FIR pin of a BH66F71662 control chip, the other end of the metal probe is respectively connected with one end of the first resistor, one end of the second resistor, a FIL pin of the BH66F71662 control chip, an FVL pin of the BH66F71662 control chip and one end of the third resistor, the other end of the first resistor is connected with an RF2 pin of the BH66F71662 control chip, the other end of the second resistor is connected with an RF1 pin of the BH66F71662 control chip, and the other end of the third resistor is connected with an SIN pin of the BH66F71662 control chip through the first capacitor;
the switch control circuit comprises a first switch and a second switch, the first switch is used for controlling the starting and the shutdown of the skin moisture detection system, and the second switch is used for controlling the starting and the shutdown of the impedance measurement circuit.
2. The skin moisture detection system of claim 1, wherein said power circuit includes a battery circuit and a USB interface charging circuit, wherein,
the battery circuit comprises a battery, an HT7533-7 voltage stabilizing chip, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor, wherein an IN pin of the HT7533-7 voltage stabilizing chip is respectively connected with the battery, one end of the second capacitor and one end of the third capacitor, an OUT pin of the HT7533-7 voltage stabilizing chip is respectively connected with one end of the fourth capacitor, one end of the fifth capacitor and a VDD pin of the BH66F71662 control chip, and a GND pin of the HT7533-7 voltage stabilizing chip, the other end of the second capacitor, the other end of the third capacitor, the other end of the fourth capacitor and the other end of the fifth capacitor are all grounded;
the USB interface charging circuit comprises a TP4057 charging management chip, a USB interface, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor and a fourth resistor, wherein the TP4057 charging management chip
One end of the pin is connected with one end of the sixth capacitor, the BAT pin of the TP4057 charging management chip is respectively connected with one end of the battery and one end of the seventh capacitor, the PROG pin of the TP4057 charging management chip is connected with one end of the fourth resistor, and the TP4057 charging management chip
The foot with the one end of eighth electric capacity links to each other, TP4057 charge management chip's VCC foot respectively with the USB interface the one end of ninth electric capacity links to each other, TP4057 charge management chip's GND foot the other end of sixth electric capacity the other end of seventh electric capacity the other end of eighth electric capacity the other end of ninth electric capacity with the other end of fourth resistance all grounds.
3. The skin moisture detection system according to claim 2, wherein a battery detection circuit is further disposed on the carrier, the battery detection circuit includes a fifth resistor, a sixth resistor and a tenth capacitor, one end of the fifth resistor is connected to the battery, the other end of the fifth resistor is respectively connected to the LVDIN pin of the BH66F71662 control chip, one end of the sixth resistor and one end of the tenth capacitor, and the other end of the sixth resistor and the other end of the tenth capacitor are grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021729909.8U CN213309703U (en) | 2020-08-18 | 2020-08-18 | Skin moisture detection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021729909.8U CN213309703U (en) | 2020-08-18 | 2020-08-18 | Skin moisture detection system |
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| CN213309703U true CN213309703U (en) | 2021-06-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115336982A (en) * | 2022-08-25 | 2022-11-15 | 苏州纳生微电子有限公司 | Skin elasticity measuring method and system |
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2020
- 2020-08-18 CN CN202021729909.8U patent/CN213309703U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115336982A (en) * | 2022-08-25 | 2022-11-15 | 苏州纳生微电子有限公司 | Skin elasticity measuring method and system |
| CN115336982B (en) * | 2022-08-25 | 2024-05-17 | 苏州纳生微电子有限公司 | Skin elasticity measuring method and measuring system |
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