Micro-dust particle sensor

Abstract

The invention belongs to the technical field of sensors, and particularly relates to a dust particle sensor which comprises a main board and an adapter plate, the main board and the adapter plate are connected with each other, the main board comprises a connector A and a connector B, and the adapter plate is a connector; the connector A is provided with nine base pins, the connector B is provided with four base pins, and the connector is provided with seven base pins; according to the overall structure provided by the embodiment of the invention, a high-precision detection technology is adopted: an optical scattering method is combined with multi-angle scattered light detection; a signal processing algorithm is introduced to reduce interference of environmental factors on a detection result; the quick response mechanism is used for capturing low-level signals in real time through external interruption and a timer, calculating the number and time of low levels, realizing quick response, optimizing a data processing flow and ensuring that a detection result is output within one second; and anti-interference design: adopting a shielding material and an anti-interference algorithm to reduce the influence of electromagnetic interference and other particulate matters, designing a filter circuit, and eliminating signal noise.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a dust particle sensor. Background Art

[0002] Dust sensing technology is an important component in environmental monitoring, smart homes, industrial production, and health management. With the increasing severity of air pollution and people's growing concern about air quality, dust sensing technology has made significant progress in the past few decades.

[0003] Dust sensing technology has evolved from its initial industrial monitoring capabilities to today's multifunctional, intelligent devices, undergoing numerous technological innovations and application expansions. In the future, with the continuous emergence of new materials, technologies, and application scenarios, dust sensing technology will continue to drive developments in environmental monitoring and health management, making greater contributions to improving air quality and protecting human health. However, existing technologies often suffer from insufficient precision and poor anti-interference capabilities. Furthermore, piezoelectric oscillation particle sensors utilize the oscillation frequency of piezoelectric materials to detect particulate matter mass. When particulate matter deposits on the surface of a piezoelectric crystal, this changes its oscillation frequency. To address these shortcomings of existing technologies, we have proposed a new dust particle sensor. Summary of the Invention

[0004] The present application provides a dust particle sensor to solve the above-mentioned problems.

[0005] The present application provides a dust particle sensor, comprising:

[0006] A main board and an adapter board, wherein the main board and the adapter board are connected to each other, and the main board includes Connector A and Connector B, and the adapter board is a Connector;

[0007] The Connector A has 9 pins, the Connector B has 4 pins, and the Connector has 7 pins;

[0008] The circuit connections between the main board and the adapter board are as follows:

[0009] The IR_EN input interface is connected to resistor R1, and resistor R1 is connected to resistor R2 and capacitor C16, and resistor R2 and capacitor C16 are connected in parallel. The resistor R2 is connected to pin 3 of amplifier U1A and capacitor C17, and the capacitors C17 and C16 are grounded.

[0010] Pin 2 of the amplifier U1A is connected to pin 1, and pin 4 of the amplifier U1A is grounded. Pin 8 of the amplifier U1A is connected to a 3.3V power supply, capacitor C3, and capacitor C5. The 3.3V power supply, capacitor C3, and capacitor C5 are connected in parallel, and capacitor C3 and capacitor C5 are grounded.

[0011] Pin 1 of the amplifier U1A is also connected to a capacitor C18 and a resistor R3, which are connected in parallel and grounded. The resistor R3 is connected to the positive electrode of the light-emitting diode, and the negative electrode of the light-emitting diode is connected to a capacitor C19 and a resistor R8, which are connected in parallel and grounded.

[0012] The light-emitting diode is connected to the phototransistor SDM, the collector of the phototransistor SDM is connected to the resistor R7, the capacitor C13, the capacitor C10, the capacitor C2 and the capacitor C4, the resistor R7, the capacitor C13, the capacitor C10, the capacitor C2 and the capacitor C4 are connected in parallel, the resistor R7 is connected to the 3.3V power supply, and the capacitor C13, the capacitor C10, the capacitor C2 and the capacitor C4 are grounded, the emitter of the phototransistor SDM is connected to the capacitor C1, the resistor R5, the resistor R20 and the pin 5 of the amplifier U1B, and the capacitor C1, the resistor R5, the resistor R20 and the pin 5 of the amplifier U1B are connected in parallel, and the capacitor C1 and the resistor R5 are grounded, and the resistor R20 is connected to the port ANO5;

[0013] Pin 6 of the amplifier U1B is connected to resistor R9 and resistor R4, and resistors R9 and R4 are grounded in parallel. Pin 7 of the amplifier U1B is connected to resistor R6, and resistor R6 is connected to resistor R10, capacitor C15 and external interrupt port INT, and resistor R10, capacitor C15 and external interrupt port INT are connected in parallel, and resistor R10 and capacitor C15 are grounded.

[0014] Preferably, the Connector A is provided with 9 pins, namely Brush+, NC, PT+, PT-, IR-, IR+, Brush-, Pad 1 and Pad 2.

[0015] Preferably, the Connector B is provided with four pins, namely VCC, PWM, NC and GND.

[0016] Preferably, the connector is provided with 7 pins, namely Brush+, NC, PT+, PT-, IR-, IR+, and Brush-, and the connector is also provided with Pad 3 and Pad 4.

[0017] Preferably, the dust particle sensor data composed of the main board and the adapter board is output in PWM form.

[0018] Preferably, the PWM output signal means the total concentration of fine dust, and the PWM period T is 1000ms, the high level time in one period is t, and the total concentration of fine dust = t / T*1000.

[0019] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0020] The overall structure provided by the embodiment of the present application and the high-precision detection technology: adopt the optical scattering method, combined with multi-angle scattered light detection; introduce the signal processing algorithm to reduce the interference of environmental factors on the detection results;

[0021] Fast response mechanism: Through external interrupts and timers, low-level signals are captured in real time, the number and duration of low levels are calculated to achieve fast response, optimize data processing flow, and ensure that test results are output within 1 second;

[0022] Low power design: Using low power chips and optimized circuit design to control power consumption below 100mW;

[0023] Anti-interference design: Shielding materials and anti-interference algorithms are used to reduce the impact of electromagnetic interference and other particulate matter, and filtering circuits are designed to eliminate signal noise;

[0024] Automatic calibration function: built-in calibration algorithm, automatic calibration of the sensor upon power-on to ensure long-term stability;

[0025] Miniaturization and portability: The sensor size is reduced to less than 50mm×25mm×1mm, and lightweight materials are used, with a total weight controlled under 100g. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 This is a structural diagram of the Connector A circuit board of the present invention;

[0029] Figure 2 This is a structural diagram of the Connector B circuit board of the present invention;

[0030] Figure 3 This is a structural diagram of the Connector circuit board of the present invention;

[0031] Figure 4 It is the overall circuit diagram of the present invention. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] The various embodiments of the present application may be presented in the form of a range. It should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the present application. Therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values within the range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, regardless of the range. In addition, whenever a numerical range is indicated in this application, it is intended to include any quoted number (fraction or integer) within the indicated range. Unless otherwise specified, the various raw materials, reagents, instruments and equipment used in this application are all commercially available or can be prepared using existing equipment.

[0034] In this application, unless otherwise specified, the directional words used, such as "upper" and "lower", specifically refer to the directions of the drawings in the accompanying drawings. In addition, in this application, the terms "including", "comprising", etc. mean "including but not limited to". In this application, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. In this application, "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. Wherein A and B can be singular or plural. In this application, "at least one" means one or more, and "plurality" means two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b, or c" or "at least one of a, b and c" can both mean: a, b, c, ab, i.e. a and b, ac, bc or abc, where a, b, c can be single or multiple.

[0035] like Figure 1-Figure 4 As shown: This embodiment of the application provides a dust particle sensor, including:

[0036] A main board and an adapter board, wherein the main board and the adapter board are connected to each other, and the main board includes Connector A and Connector B, and the adapter board is a Connector;

[0037] The Connector A has 9 pins, the Connector B has 4 pins, and the Connector has 7 pins;

[0038] The circuit connections between the main board and the adapter board are as follows:

[0039] The IR_EN input interface is connected to resistor R1, and resistor R1 is connected to resistor R2 and capacitor C16, and resistor R2 and capacitor C16 are connected in parallel. The resistor R2 is connected to pin 3 of amplifier U1A and capacitor C17, and the capacitors C17 and C16 are grounded.

[0040] Pin 2 of the amplifier U1A is connected to pin 1, and pin 4 of the amplifier U1A is grounded. Pin 8 of the amplifier U1A is connected to a 3.3V power supply, capacitor C3, and capacitor C5. The 3.3V power supply, capacitor C3, and capacitor C5 are connected in parallel, and capacitor C3 and capacitor C5 are grounded.

[0041] Pin 1 of the amplifier U1A is also connected to a capacitor C18 and a resistor R3, which are connected in parallel and grounded. The resistor R3 is connected to the positive electrode of the light-emitting diode, and the negative electrode of the light-emitting diode is connected to a capacitor C19 and a resistor R8, which are connected in parallel and grounded.

[0042] The light-emitting diode is connected to the phototransistor SDM, the collector of the phototransistor SDM is connected to the resistor R7, the capacitor C13, the capacitor C10, the capacitor C2 and the capacitor C4, the resistor R7, the capacitor C13, the capacitor C10, the capacitor C2 and the capacitor C4 are connected in parallel, the resistor R7 is connected to the 3.3V power supply, and the capacitor C13, the capacitor C10, the capacitor C2 and the capacitor C4 are grounded, the emitter of the phototransistor SDM is connected to the capacitor C1, the resistor R5, the resistor R20 and the pin 5 of the amplifier U1B, and the capacitor C1, the resistor R5, the resistor R20 and the pin 5 of the amplifier U1B are connected in parallel, and the capacitor C1 and the resistor R5 are grounded, and the resistor R20 is connected to the port ANO5;

[0043] Pin 6 of the amplifier U1B is connected to resistor R9 and resistor R4, and resistors R9 and R4 are grounded in parallel. Pin 7 of the amplifier U1B is connected to resistor R6, and resistor R6 is connected to resistor R10, capacitor C15 and external interrupt port INT, and resistor R10, capacitor C15 and external interrupt port INT are connected in parallel, and resistor R10 and capacitor C15 are grounded.

[0044] The Connector A is provided with 9 pins, namely Brush+, NC, PT+, PT-, IR-, IR+, Brush-, Pad1 and Pad 2.

[0045] Specifically: Brush+, NC, PT+, PT-, IR-, IR+, Brush-, Pad 1 and Pad 2 are respectively the positive pole of the vacuum cleaner roller brush, the empty foot, the positive pole of the sensor receiving plate, the negative pole of the sensor receiving plate, the negative pole of the sensor transmitting plate, the positive pole of the sensor transmitting plate, the negative pole of the vacuum cleaner roller brush, the positive pole of the vacuum cleaner roller brush and the negative pole of the vacuum cleaner roller brush.

[0046] The Connector B is provided with 4 pins, namely VCC, PWM, NC and GND.

[0047] Specifically: VCC, PWM, NC and GND are sensor power supply positive, PWM output, empty pin and sensor ground respectively.

[0048] The connector is provided with 7 pins, namely Brush+, NC, PT+, PT-, IR-, IR+, and Brush-. The connector is also provided with Pad 3 and Pad 4.

[0049] Brush+, NC, PT+, PT-, IR-, IR+, Brush-, Pad 3 and Pad 4 are respectively the positive pole of the vacuum cleaner roller brush, the empty foot, the negative pole of the sensor receiving plate, the positive pole of the sensor receiving plate, the negative pole of the sensor transmitting plate, the positive pole of the sensor transmitting plate, the negative pole of the vacuum cleaner roller brush, the positive pole of the vacuum cleaner roller brush and the negative pole of the vacuum cleaner roller brush.

[0050] The dust particle sensor data composed of the main board and the adapter board is output in PWM form.

[0051] The PWM output signal means the total dust concentration, and the PWM period T is 1000ms, the high level time in one period is t, and the total dust concentration = t / T*1000.

[0052] Principle: Connector A and Connector B are placed at 180°±10° to Connector A. The Connector receives light from the transmitting tube to generate photocurrent, forming a light signal. When particles pass through, the light intensity received by the Connector changes due to the optical shadow principle, forming a pulse with varying values. After filtering and amplification, and processing by the MCU, the particle size of the passing particles is determined based on the pulse size, and the particles are counted, and ultimately calculated as the number and mass concentration of the particles.

[0053] Sensor Mainboard (Connector A and Connector B): The sensor mainboard components utilize SMT (Surface Mount Technology) technology, improving efficiency and reliability. Terminals are manually inserted and wave soldered, and the mainboard magnetic toroidal wiring harness is soldered using a manual jig. After soldering, the terminals and wiring harness are coated with yellow glue.

[0054] Adapter board and transmitter-receiver board (Connector): manual plug-in and wave soldering are used.

[0055] Testing: Use customized test fixtures with fool-proofing treatment to test the power harness and output signal functions, and perform tension tests on the harness.

[0056] Packaging: The main board and wiring harness board are packed separately in anti-static bags to prevent static electricity and collision.

[0057] High-precision detection technology: uses optical scattering method combined with multi-angle scattered light detection; introduces signal processing algorithm to reduce the interference of environmental factors (such as humidity and temperature) on the detection results.

[0058] Fast response mechanism: Through external interrupts and timers, low-level signals are captured in real time, the number and time of low levels are calculated to achieve fast response, optimize data processing flow, and ensure that the detection results are output within 1 second.

[0059] Low power design: Using low power chips and optimized circuit design to control power consumption below 100mW.

[0060] Anti-interference design: Shielding materials and anti-interference algorithms are used to reduce the impact of electromagnetic interference and other particulate matter (such as smoke and pollen), and filtering circuits are designed to eliminate signal noise.

[0061] Automatic calibration function: Built-in calibration algorithm automatically calibrates the sensor upon power-up to ensure long-term stability.

[0062] Miniaturization and portability: The sensor size is reduced to less than 50mm×25mm×1mm, and lightweight materials are used, with a total weight controlled under 100g.

[0063] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but rather is intended to conform to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A dust particle sensor, characterized in that: include: A main board and an adapter board, wherein the main board and the adapter board are connected to each other, and the main board includes Connector A and Connector B, and the adapter board is a Connector; The Connector A has 9 pins, the Connector B has 4 pins, and the Connector has 7 pins; The circuit connections between the main board and the adapter board are as follows: The IR_EN input interface is connected to resistor R1, and resistor R1 is connected to resistor R2 and capacitor C16, and resistor R2 and capacitor C16 are connected in parallel. The resistor R2 is connected to pin 3 of amplifier U1A and capacitor C17, and the capacitors C17 and C16 are grounded. Pin 2 of the amplifier U1A is connected to pin 1, and pin 4 of the amplifier U1A is grounded. Pin 8 of the amplifier U1A is connected to a 3.3V power supply, capacitor C3, and capacitor C5. The 3.3V power supply, capacitor C3, and capacitor C5 are connected in parallel, and capacitor C3 and capacitor C5 are grounded. Pin 1 of the amplifier U1A is also connected to a capacitor C18 and a resistor R3, which are connected in parallel and grounded. The resistor R3 is connected to the positive electrode of the light-emitting diode, and the negative electrode of the light-emitting diode is connected to a capacitor C19 and a resistor R8, which are connected in parallel and grounded. The light-emitting diode is connected to the phototransistor SDM, the collector of the phototransistor SDM is connected to the resistor R7, the capacitor C13, the capacitor C10, the capacitor C2 and the capacitor C4, the resistor R7, the capacitor C13, the capacitor C10, the capacitor C2 and the capacitor C4 are connected in parallel, the resistor R7 is connected to the 3.3V power supply, and the capacitor C13, the capacitor C10, the capacitor C2 and the capacitor C4 are grounded, the emitter of the phototransistor SDM is connected to the capacitor C1, the resistor R5, the resistor R20 and the pin 5 of the amplifier U1B, and the capacitor C1, the resistor R5, the resistor R20 and the pin 5 of the amplifier U1B are connected in parallel, and the capacitor C1 and the resistor R5 are grounded, and the resistor R20 is connected to the port ANO5; Pin 6 of the amplifier U1B is connected to resistor R9 and resistor R4, and resistors R9 and R4 are grounded in parallel. Pin 7 of the amplifier U1B is connected to resistor R6, and resistor R6 is connected to resistor R10, capacitor C15 and external interrupt port INT, and resistor R10, capacitor C15 and external interrupt port INT are connected in parallel, and resistor R10 and capacitor C15 are grounded.

2. The dust particle sensor according to claim 1, characterized in that: The Connector A is provided with 9 pins, namely Brush+, NC, PT+, PT-, IR-, IR+, Brush-, Pad 1 and Pad 2.

3. The dust particle sensor according to claim 1, characterized in that: The Connector B is provided with 4 pins, namely VCC, PWM, NC and GND.

4. The dust particle sensor according to claim 1, characterized in that: The connector is provided with 7 pins, namely Brush+, NC, PT+, PT-, IR-, IR+, and Brush-. The connector is also provided with Pad 3 and Pad 4.

5. The dust particle sensor according to claim 1, characterized in that: The dust particle sensor data composed of the main board and the adapter board is output in PWM form.

6. The dust particle sensor according to claim 5, characterized in that: The PWM output signal means the total dust concentration, and the PWM period T is 1000ms, the high level time in one period is t, and the total dust concentration = t / T*1000.

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