Environment detection device for dust environment

Abstract

The utility model belongs to the technical field of environment detection, and particularly relates to an environment detection device for a dust environment, which comprises a microcontroller connected with a signal processing module, a display module and an alarm module. The signal processing module is further connected with a connector used for being connected with a dust concentration sensor. The signal processing module comprises a signal amplification circuit, and the signal amplification circuit is provided with a first adjustable resistor R1 and a second adjustable resistor R2, so that the signal amplification circuit can adjust the resistance values of the first adjustable resistor R1 and the second adjustable resistor R2 according to actual requirements to adjust the amplification factor so as to adapt to dust concentration sensors of different models; therefore, resource waste is avoided, and production cost is reduced.

Description

An environmental monitoring device for dusty environments Technical Field

[0001] This utility model belongs to the field of environmental monitoring technology, specifically relating to an environmental monitoring device for dusty environments. Background Technology

[0002] With the accelerated development of industrialization, people's living standards are gradually improving, and the air quality of the living environment is also receiving attention. Among them, dust in the environment is one of the important factors affecting air quality. Therefore, the concentration of dust in the air is one of the means to judge whether the air quality is good or bad.

[0003] In existing technologies, dust concentration sensors are generally used to detect the dust concentration in the air and output a corresponding voltage detection signal. An environmental monitoring device is connected to the dust concentration sensor to acquire the voltage signal output by the dust concentration sensor. The voltage signal is then processed to determine the dust concentration in the air. The amplification and filtering circuits in existing environmental monitoring devices are generally designed to amplify and filter the voltage signal output by a single type of dust concentration sensor. Since there are currently many different types of dust concentration sensors, this method cannot be applied to multiple types of dust concentration sensors, resulting in resource waste and high production costs. Summary of the Invention

[0004] In order to solve the technical problems existing in the background art, the present invention provides an environmental detection device for dusty environments, which helps to amplify the voltage detection signals output by dust concentration sensors with various different signals, thereby avoiding resource waste and reducing production costs.

[0005] To achieve the above technical solution, this utility model provides an environmental detection device for dusty environments, including: a microcontroller; the microcontroller is connected to a signal processing module, a display module and an alarm module; the signal processing module is also connected to a connector for connecting to a dust concentration sensor.

[0006] The signal processing module includes a signal amplification circuit, which includes: an input terminal Vin, which is connected to a connector, and the input terminal Vin is connected to the first terminal of an adjustable resistor R1 and the positive input terminal of a first operational amplifier U1 through a first capacitor C1; the second terminal of the adjustable resistor R1 is connected to a first power supply VCC1.

[0007] The negative input terminal of the first operational amplifier U1, the first terminal of the second adjustable resistor R2, and the first terminal of the second capacitor C2 are grounded through the third resistor R3; the second terminal of the second adjustable resistor R2 and the second terminal of the second capacitor C2 are connected to the output terminal of the first operational amplifier U1, and the output terminal of the first operational amplifier U1 is connected to the output terminal Vout1 of the signal amplification circuit.

[0008] Furthermore, the signal processing module also includes a voltage follower circuit;

[0009] The voltage follower circuit includes: a third capacitor C3, the first end of which is connected to the output terminal Vout1 of the signal amplification circuit; the second end of the third capacitor C3 and the positive input terminal of the second operational amplifier U2 are grounded through a fourth resistor R4; the negative input terminal of the second operational amplifier U2 is connected to the output terminal of the second operational amplifier U2; and the output terminal of the second operational amplifier U2 is grounded through a fourth capacitor C4 and connected to the output terminal Vout of the voltage follower circuit.

[0010] Furthermore, the first operational amplifier U1 is an LM2904 amplifier; the second operational amplifier U2 is an LMV321 operational amplifier.

[0011] Furthermore, the environmental monitoring device also includes a wireless communication module, which is connected to a microcontroller.

[0012] Furthermore, the wireless communication module employs both a WiFi communication module and an RF wireless communication module.

[0013] Furthermore, the microcontroller is an STM32 series microcontroller.

[0014] The beneficial effects of this utility model are:

[0015] (1) According to actual needs, the amplification factor can be adjusted by adjusting the resistance values ​​of the first adjustable resistor R1 and the second adjustable resistor R2 to adapt to different types of dust concentration sensors, thereby avoiding resource waste and reducing production costs.

[0016] (2) By setting a voltage follower circuit, this utility model can reduce the output impedance, and by setting a capacitor after the voltage follower, it helps to filter out high-frequency noise, thereby making the detection results more accurate.

[0017] The advantages of this invention in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0019] Figure 1 is an electrical schematic diagram of an environmental monitoring device for dusty environments according to an embodiment;

[0020] Figure 2 is a circuit diagram of a signal amplification circuit for an environmental detection device in a dusty environment according to one embodiment;

[0021] Figure 3 is a circuit diagram of a voltage follower circuit for an environmental detection device for a dusty environment according to another embodiment.

[0022] 1-Microcontroller; 2-Display module; 3-Alarm module; 5-Signal processing module; 6-Connector; 7-Dust concentration sensor. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, each technical and scientific term used in this embodiment has the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various components or elements of this utility model and do not specifically refer to any component or element in this utility model. They should not be construed as limiting this utility model.

[0027] In this utility model, terms such as "fixed connection," "connected," and "joined" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For researchers or maintenance personnel in this field, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0028] Example 1:

[0029] As shown in Figure 1, this embodiment provides an environmental detection device for dusty environments, including: a microcontroller 1, which is connected to a signal processing module 5, a display module 2 and an alarm module 3; the signal processing module 5 is also connected to a connector 6 for connecting to a dust concentration sensor 7.

[0030] The signal processing module 5 is used to set the amplification factor according to actual needs, so as to amplify the voltage detection signal input by the dust concentration sensor 7 according to the set amplification factor;

[0031] The microcontroller 1 is used to perform analog-to-digital conversion on the voltage detection signal amplified by the signal processing module 5, and to display the converted digital signal through the display module, as well as to control the alarm module to trigger an alarm.

[0032] Signal processing module 5 includes a signal amplification circuit, as shown in Figure 2. The signal amplification circuit includes: an input terminal Vin, which is connected to a connector; the input terminal Vin is connected to the first terminal of an adjustable resistor R1 and the positive input terminal of a first operational amplifier U1 through a first capacitor C1; and the second terminal of the adjustable resistor R1 is connected to a first power supply VCC1.

[0033] The negative input terminal of the first operational amplifier U1, the first terminal of the second adjustable resistor R2, and the first terminal of the second capacitor C2 are grounded through the third resistor R3; the second terminal of the second adjustable resistor R2 and the second terminal of the second capacitor C2 are connected to the output terminal of the first operational amplifier U1, and the output terminal of the first operational amplifier U1 is connected to the output terminal Vout1 of the signal amplification circuit; wherein, the first operational amplifier U1 is an LM2904 amplifier.

[0034] In this embodiment, the calculation principle of the amplification factor of the signal processing circuit is as follows:

[0035] Assuming the magnitude of the voltage detection signal input from the dust concentration sensor to the signal processing module is m1; the magnitude of the voltage detection signal output from the signal processing module is m2; the resistance of the first adjustable resistor R1 is n1; and the resistance of the second adjustable resistor R2 is n2, then the formula for calculating the amplification factor is as follows:

[0036] m2 = (n2 / n1+1)*m1;

[0037] Therefore, the magnification factor K can be obtained as: K = (n2 / n1 + 1).

[0038] In summary, this utility model can adjust the amplification factor by adjusting the resistance values ​​of the first adjustable resistor R1 and the second adjustable resistor R2 according to actual needs, so as to adapt to different models of dust concentration sensors, thereby avoiding resource waste and reducing production costs.

[0039] As shown in Figure 3, in another embodiment, the signal processing module 5 further includes a voltage follower circuit; the voltage follower circuit includes: a third capacitor C3, the first end of the third capacitor C3 being connected to the output terminal Vout1 of the signal amplification circuit; the second end of the third capacitor C3 and the positive input terminal of the second operational amplifier U2 being grounded through a fourth resistor R4; the negative input terminal of the second operational amplifier U2 being connected to the output terminal of the second operational amplifier U2; the output terminal of the second operational amplifier U2 being grounded through a fourth capacitor C4 and connected to the output terminal Vout of the voltage follower circuit, wherein the output terminal Vout of the voltage follower circuit is the output terminal of the signal processing module; the second operational amplifier U2 is an LMV321 operational amplifier.

[0040] This embodiment reduces the output impedance by setting a voltage follower circuit, and the addition of a capacitor after the voltage follower helps filter out high-frequency noise, thereby making the detection results more accurate.

[0041] In another embodiment, the environmental monitoring device for the dust environment further includes a wireless communication module connected to a microcontroller to transmit the detected dust concentration to a worker's portable terminal or monitoring equipment. The wireless communication module can be a WiFi communication module or an RF wireless communication module.

[0042] The same or similar parts between the various embodiments in this specification can be referred to mutually. In particular, for the terminal embodiments, since they are basically similar to the method embodiments, the description and comparison are simple, and the relevant parts can be referred to the description in the method embodiments.

[0043] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0044] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An environmental monitoring device for dusty environments, characterized in that, include: microcontroller; The microcontroller is connected to a signal processing module, a display module, and an alarm module; The signal processing module is also connected to a connector for connecting to a dust concentration sensor. The signal processing module includes a signal amplification circuit, which includes: an input terminal Vin, connected to a connector, connected to the first terminal of an adjustable resistor R1 and the positive input terminal of a first operational amplifier U1 via a first capacitor C1; the second terminal of the adjustable resistor R1 is connected to a first power supply VCC1; the negative input terminal of the first operational amplifier U1, the first terminal of the second adjustable resistor R2, and the first terminal of the second capacitor C2 are grounded via a third resistor R3; the second terminal of the second adjustable resistor R2 and the second terminal of the second capacitor C2 are connected to the output terminal of the first operational amplifier U1, and the output terminal of the first operational amplifier U1 is connected to the output terminal Vout1 of the signal amplification circuit.

2. The environmental monitoring device for dusty environments according to claim 1, characterized in that, The signal processing module further includes a voltage follower circuit; the voltage follower circuit includes: a third capacitor C3, the first end of the third capacitor C3 being connected to the output terminal Vout1 of the signal amplification circuit; the second end of the third capacitor C3 and the positive input terminal of the second operational amplifier U2 being grounded through a fourth resistor R4; the negative input terminal of the second operational amplifier U2 being connected to the output terminal of the second operational amplifier U2; and the output terminal of the second operational amplifier U2 being grounded through a fourth capacitor C4 and connected to the output terminal Vout of the voltage follower circuit.

3. The environmental monitoring device for dusty environments according to claim 2, characterized in that, The first operational amplifier U1 is an LM2904 amplifier; the second operational amplifier U2 is an LMV321 operational amplifier.

4. The environmental monitoring device for dusty environments according to claim 1, characterized in that, The environmental monitoring device also includes a wireless communication module, which is connected to a microcontroller.

5. The environmental monitoring device for dusty environments according to claim 4, characterized in that, The wireless communication module employs both a WiFi communication module and an RF wireless communication module.

6. The environmental monitoring device for dusty environments according to claim 1, characterized in that, The microcontroller is an STM32 series microcontroller.

Images