Tilt angle sensor based on accelerometer

Abstract

The utility model discloses a tilt angle sensor based on an accelerometer, which relates to the field of tilt angle monitoring and comprises a power supply circuit used for converting an external power supply into a circuit working power supply; the reference source generating circuit is used for generating a voltage reference source, and the microcontroller circuit is used for controlling the input port and the output port to complete real-time signal exchange with peripheral equipment; according to the tilt angle sensor based on the accelerometer, through a low-power-consumption design method, selection of a low-power-consumption device, optimization of circuit design and optimization of a circuit working mode, the overall power consumption can be effectively reduced, and through selection of a high-precision precise device and enhancement of filtering design, interference is reduced, precision is improved, and control is more accurate; by designing various types of output interfaces, including an RS485 output interface, a current source output interface, a digital signal output interface and a wireless module interface, the output is more flexible and convenient.

Description

Technical Field

[0001] The utility model relates to an inclination monitoring technology, in particular to an inclination sensor based on an accelerometer. Background Art

[0002] The inclination sensor is a sensor used to measure the inclination angle of an object. It can detect the inclination angle of an object by measuring the angle between the object and the horizontal plane. The inclination sensor is widely used in many application fields, such as robots, drones, construction engineering, mining, military industry, etc.

[0003] With the rapid development and transformation and upgrading of China's economy, the inclination sensor industry has also developed rapidly.

[0004] At present, the technical level of the tilt sensor industry is constantly improving, and the scope of application is becoming wider and wider. However, there are also some disadvantages in the process of use: (1) low measurement accuracy; (2) high power consumption; (3) insufficient expansion of output signal types. Utility Model Content

[0005] The purpose of the utility model is to provide an accelerometer-based inclination sensor to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the utility model provides the following technical solution: an accelerometer-based inclination sensor, comprising:

[0007] A power supply circuit, the power supply circuit is used to convert an external power supply into a circuit working power supply;

[0008] A reference source generating circuit, wherein the reference source generating circuit is used to generate a voltage reference source:

[0009] A microcontroller circuit, wherein the microcontroller circuit is used to control the input port and the output port to complete real-time signal exchange with peripheral devices;

[0010] An inclination measurement circuit, wherein the inclination measurement circuit is used to calculate acceleration and angle;

[0011] A signal conditioning circuit, wherein the signal conditioning circuit is used for performing signal conditioning;

[0012] Interface circuit, the interface circuit is used to connect multiple output interfaces, the multiple output interfaces include RS485 output interface, current source output interface, digital signal output interface, wireless module interface:

[0013] Furthermore, the power supply circuit introduces the external input 12V~24V signal into the DCDC power conversion module U5 through the P+ and P- terminals, the fuse F4, the surge protection D7 and the anti-reverse connection diode D1, and generates the whole machine working power VDD after LC filtering. After magnetic bead isolation, VCC is used as an analog power supply, and then the LDO linear regulator U11 generates a 3.3V working power supply.

[0014] Furthermore, the reference source generating circuit is used to generate a 5V voltage reference source from VCC via an adjustable precision reference source D8, and then generate 2.5V and 1.5V voltage reference sources via U10.

[0015] Furthermore, the microcontroller circuit includes a microcontroller chip U2, a VCC pin of the microcontroller chip U2 is grounded, a VDD pin of the microcontroller chip U2 is connected to a VDD output terminal, and the VDD pin is grounded through a capacitor C14, and a 24 pin of the microcontroller chip U2 is connected to an AGND pin.

[0016] Furthermore, the inclination measurement circuit includes a dual-axis accelerometer U9, and the model of the dual-axis accelerometer U9 is ADXL203. The dual-axis accelerometer U9 generates a voltage signal proportional to the acceleration of the X-axis and the Y-axis, and sends it to the signal conditioning circuit composed of the chip U7 for conditioning to generate four signals of X+, X-, Y+, and Y-, which are input into the microcontroller U2 for AD conversion and the acceleration and angle are solved internally.

[0017] Furthermore, the interface circuit includes an RS485 output interface circuit, a 4-20mA current source signal output interface circuit, a digital quantity output circuit and a wireless module interface circuit. The RS485 output interface circuit is composed of a U4 chip, outputs RS485 signals 485_A and 485_B, and communicates with other devices to transmit data and instructions; the 4-20mA current source signal output interface circuit is composed of chips U3, U8 and peripheral circuits, the digital quantity output interface is used to output signals, the signals include digital signals and pulse signals, the signals are output as digital signals after being isolated by an optical coupler U6, and the wireless module interface can be equipped with a wireless Internet of Things LoRa module and a wireless Internet of Things module.

[0018] Compared with the prior art, the utility model provides an accelerometer-based inclination sensor, which can effectively reduce the overall power consumption through a low-power design method, by selecting low-power devices, optimizing circuit design and optimizing circuit working mode, and by selecting high-precision precision devices and strengthening filtering design, reducing interference, improving accuracy and making control more precise; by designing various types of output interfaces, including RS485 output interface, current source output interface, digital signal output interface and wireless module interface, the output is made more flexible and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 The overall structural diagram provided for the embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the RS485 output interface circuit connection structure provided by the embodiment of the utility model;

[0022] Figure 3 A schematic diagram of the connection structure of the X-axis output signal 4-20mA output circuit provided by the embodiment of the utility model;

[0023] Figure 4 A schematic diagram of the connection structure of the Y-axis output signal 4-20mA output circuit provided by the embodiment of the utility model;

[0024] Figure 5 A schematic diagram of the connection structure of a microcontroller circuit provided in an embodiment of the utility model;

[0025] Figure 6 A schematic diagram of a digital output circuit connection structure provided by an embodiment of the utility model;

[0026] Figure 7 A schematic diagram of the wireless module interface structure provided by an embodiment of the utility model;

[0027] Figure 8 A schematic diagram of the connection structure of the inclination measurement circuit provided by the embodiment of the utility model;

[0028] Fig. 9 A schematic diagram of the signal conditioning circuit connection structure provided by an embodiment of the utility model;

[0029] Fig.10 A schematic diagram of the connection structure of the 2.5V and 1.5V voltage reference source circuits provided in the embodiment of the utility model;

[0030] Fig.11 A schematic diagram of the connection structure of a 5V voltage reference source circuit provided by an embodiment of the utility model;

[0031] Fig.12 A schematic diagram of the connection structure of an LDO power supply circuit provided by an embodiment of the utility model;

[0032] Fig.13 This is a schematic diagram of the connection structure of a DCDC power supply circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] See also Figure 1-13 , an accelerometer-based inclination sensor, comprising:

[0035] A power supply circuit, which is used to convert an external power supply into a circuit working power supply;

[0036] Reference source generating circuit, the reference source generating circuit is used to generate a voltage reference source:

[0037] A microcontroller circuit, wherein the microcontroller circuit is used to control input ports and output ports to complete real-time signal exchange with peripheral devices;

[0038] Inclination measurement circuit, the inclination measurement circuit is used to calculate acceleration and angle;

[0039] A signal conditioning circuit, wherein the signal conditioning circuit is used for signal conditioning;

[0040] Interface circuit, the interface circuit is used to connect multiple output interfaces, multiple output interfaces include RS485 output interface, current source output interface, digital signal output interface, wireless module interface:

[0041] The power supply circuit introduces the external 12V~24V signal into the DCDC power conversion module U5 through the P+ and P- terminals, the fuse F4, the surge protection D7 and the anti-reverse connection diode D1. After LC filtering, the whole machine working power supply VDD is generated. After magnetic bead isolation, VCC is used as the analog power supply, and then the LDO linear regulator U11 generates a 3.3V working power supply.

[0042] The reference source generation circuit is used to generate a 5V voltage reference source from VCC via an adjustable precision reference source D8, and then generate 2.5V and 1.5V voltage reference sources via U10.

[0043] The microcontroller circuit includes a microcontroller chip U2, a VCC pin of the microcontroller chip U2 is grounded, a VDD pin of the microcontroller chip U2 is connected to a VDD output terminal, and the VDD pin is grounded through a capacitor C14, and a 24 pin of the microcontroller chip U2 is connected to an AGND pin.

[0044] The inclination measurement circuit includes a dual-axis accelerometer U9, and the model of the dual-axis accelerometer U9 is ADXL203. The dual-axis accelerometer U9 generates a voltage signal proportional to the acceleration of the X-axis and the Y-axis, and sends it to the signal conditioning circuit composed of the chip U7 for conditioning to generate four signals of X+, X-, Y+, and Y-, which are input into the microcontroller U2 for AD conversion and the acceleration and angle are solved internally.

[0045] The interface circuit includes an RS485 output interface circuit, a 4-20mA current source signal output interface circuit, a digital output circuit and a wireless module interface circuit. The RS485 output interface circuit is composed of the U4 chip, which outputs RS485 signals 485_A and 485_B, and communicates with other devices to transmit data and instructions; the 4-20mA current source signal output interface circuit is composed of chips U3, U8 and peripheral circuits. The digital output interface is used to output signals. The signals include digital signals and pulse signals. The signals are isolated by the optical coupler U6 and then output as digital signals. The wireless module interface can be equipped with a wireless Internet of Things LoRa module and a wireless Internet of Things module.

[0046] Working principle: Through low-power design methods, by selecting low-power devices, optimizing circuit design and optimizing circuit working mode, the overall power consumption can be effectively reduced. By selecting high-precision precision devices and strengthening filtering design, interference can be reduced, accuracy can be improved, and control can be made more precise. By designing various types of output interfaces, including RS485 output interface, current source output interface, digital signal output interface, and wireless module interface, the output is made more flexible and convenient.

[0047] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An accelerometer-based inclination sensor, It is characterized in that include: A power supply circuit, the power supply circuit is used to convert an external power supply into a circuit working power supply; A reference source generating circuit, wherein the reference source generating circuit is used to generate a voltage reference source: A microcontroller circuit, wherein the microcontroller circuit is used to control the input port and the output port to complete real-time signal exchange with peripheral devices; An inclination measurement circuit, wherein the inclination measurement circuit is used to calculate acceleration and angle; A signal conditioning circuit, wherein the signal conditioning circuit is used for performing signal conditioning; The interface circuit is used to connect multiple output interfaces, and the multiple output interfaces include RS485 output interface, current source output interface, digital signal output interface, and wireless module interface.

2. An accelerometer-based inclination sensor according to claim 1, It is characterized in that The power supply circuit introduces the external input 12V~24V signal into the DCDC power conversion module U5 through the P+ and P- terminals, the fuse F4, the surge protection D7 and the anti-reverse connection diode D1, and generates the whole machine working power VDD after LC filtering. After magnetic bead isolation, VCC is used as the analog power supply, and then the LDO linear regulator U11 generates a 3.3V working power supply.

3. The accelerometer-based inclination sensor according to claim 1, It is characterized in that The reference source generating circuit is used to generate a 5V voltage reference source from VCC via an adjustable precision reference source D8, and then generate 2.5V and 1.5V voltage reference sources via U10.

4. The accelerometer-based inclination sensor according to claim 1, It is characterized in that The microcontroller circuit includes a microcontroller chip U2, a VCC pin of the microcontroller chip U2 is grounded, a VDD pin of the microcontroller chip U2 is connected to a VDD output terminal, and the VDD pin is grounded via a capacitor C14, and a 24 pin of the microcontroller chip U2 is connected to an AGND pin.

5. The accelerometer-based inclination sensor according to claim 1, It is characterized in that The inclination measurement circuit includes a dual-axis accelerometer U9, and the model of the dual-axis accelerometer U9 is ADXL203. The dual-axis accelerometer U9 generates a voltage signal proportional to the acceleration of the X-axis and the Y-axis, and sends it to a signal conditioning circuit composed of a chip U7 for conditioning to generate four signals of X+, X-, Y+, and Y-, which are input into the microcontroller U2 for AD conversion and the acceleration and angle are calculated internally.

6. The accelerometer-based inclination sensor according to claim 1, It is characterized in that The interface circuit includes an RS485 output interface circuit, a 4-20mA current source signal output interface circuit, a digital quantity output circuit and a wireless module interface circuit. The RS485 output interface circuit is composed of a U4 chip, outputs RS485 signals 485_A and 485_B, and communicates with other devices to transmit data and instructions; the 4-20mA current source signal output interface circuit is composed of chips U3, U8 and peripheral circuits. The digital quantity output interface is used to output signals, and the signals include digital signals and pulse signals. The signals are output as digital signals after being isolated by an optical coupler U6. The wireless module interface can be equipped with a wireless Internet of Things LoRa module and a wireless Internet of Things module.

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