Low-power-consumption LoRaWAN tilt angle sensor system installed at any position

Abstract

The utility model relates to a low-power-consumption LoRaWAN tilt angle sensor system installed at any position, which is characterized by comprising a single chip microcomputer, a battery discharge management circuit, and a power switch circuit, a temperature sensor circuit, a triaxial accelerometer, a power supply and discharge control circuit and a LoRaWAN wireless communication module circuit which are respectively connected with the single chip microcomputer, and the power switch circuit is respectively connected with the battery discharge management circuit and the LoRaWAN wireless communication module circuit. Compared with the prior art, the utility model has the advantages of low power consumption, installation at any position, wide range, uncovering-free starting and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of sensor especially is concerned with a low power consumption arbitrary position installed LoRaWAN inclination sensor system. BACKGROUND

[0002] Inclination sensor is a kind of instrument for measuring the inclination angle of object relative to horizontal plane, is widely used in industrial automation, engineering construction, automobile safety, aerospace and consumer electronics etc. It can help to detect the posture and motion state of equipment, ensure system stability and accuracy, which utilizes gravity as reference, when sensor is inclined, the gravity component that the internal sensitive element (such as accelerometer or gyroscope) feels changes, and then calculates the inclination angle.

[0003] At present, three-axis inclination sensor of three-axis measurement ±90 ° range has restriction in installation direction, and needs to open cover and power on to start, and installation convenience is insufficient, in addition, there are problems of high power consumption, short service life of battery power supply. UTILITY MODEL CONTENTS

[0004] To solve the technical problems in the background art, the utility model provides a kind of low power consumption arbitrary position installed LoRaWAN inclination sensor system, its characterized in that, the system includes single-chip microcomputer, battery discharge management circuit and respectively with single-chip microcomputer connection power switch circuit, temperature sensor circuit, three-axis accelerometer and supply discharge control circuit and LoRaWAN wireless communication module circuit, the power switch circuit is connected with battery discharge management circuit and LoRaWAN wireless communication module circuit respectively.

[0005] Further, the battery discharge management circuit includes lithium sub-battery, charge-discharge management module and external power output port, the charge-discharge management module is constituted by charge-discharge management chip, resistance and jumper resistance, the lithium sub-battery negative pole is grounded, and the positive pole is connected with the charge-discharge management chip power supply pin and the external power output port through Schottky diode, the external power output port is connected with the power switch circuit.

[0006] Further, the battery discharge management circuit further includes composite pulse capacitor, one end of the composite pulse capacitor is grounded, and the other end is connected between the Schottky diode and the charge-discharge management chip power supply pin.

[0007] Further, the power switch circuit includes battery power supply interface connected with the external power output port, anti-reverse connection double diode and debugging power input port, the No.1 pin of the anti-reverse connection double diode is connected with the debugging power input port through self-restoring fuse, the No.2 pin is connected with the battery power supply interface, and the No.3 pin is connected with the power output end VDD of the power switch circuit.

[0008] Further, the temperature sensor circuit comprises a temperature sensor chip, which communicates with the single-chip microcomputer through a single bus communication interface and is controlled to be powered by a GPIO interface of the single-chip microcomputer.

[0009] Further, the three-axis accelerometer and power supply and discharge control circuit comprises a three-axis MEMS accelerometer chip and a power supply and discharge control sub-circuit, one end of the power supply and discharge control sub-circuit is connected with an accelerometer power supply control pin of the single-chip microcomputer, and the other end is connected with a power supply pin of the three-axis MEMS accelerometer chip, the three-axis MEMS accelerometer chip communicates with the single-chip microcomputer through an I 2 C interface, the single-chip microcomputer calculates angle data through an arctangent algorithm and outputs the angle data.

[0010] Further, the single-chip microcomputer is connected with a crystal chip used by a single-chip microcomputer MCU core and a crystal chip used by a low-power RTC real-time clock module, different crystal frequencies are set in different working modes corresponding to different working loads to reduce power consumption.

[0011] Further, the LoRaWAN wireless communication module circuit comprises a LoRaWAN module power supply control sub-circuit and a LoRaWAN module sub-circuit, the LoRaWAN module power supply control sub-circuit comprises a PMOS tube and a triode, a base of the triode is connected with a wireless communication module power supply control pin of the single-chip microcomputer, a collector is grounded, an emitter is connected with a gate of the PMOS tube, a source of the PMOS tube is connected with the LoRaWAN module sub-circuit, and a drain is connected with an output end of the power switch circuit.

[0012] Further, the LoRaWAN module sub-circuit comprises a LoRaWAN module and an indicator light module, a reset module and an antenna module connected with the LoRaWAN module respectively.

[0013] Further, the system further comprises a cover-free starting module, the cover-free starting module comprises a Hall switch circuit and a magnet connected with the power switch circuit and the single-chip microcomputer respectively, the Hall switch circuit comprises at least one Hall switch chip, the Hall switch chip is triggered to output and sent to the single-chip microcomputer through the magnet, and the single-chip microcomputer realizes cover-free starting according to a pre-set triggering sequence and counting.

[0014] Compared with the prior art, the utility model has the advantages of the following:

[0015] I. Low power consumption: the utility model discloses switch control circuit for LoRaWAN module and three-axis accelerometer respectively, when the tilt sensor system enters the sleep state, the singlechip can close all peripheral power, and adopts the strategy of periodic awakening, greatly reduces the sleep power consumption, and the power consumption is reduced to only 10uA when sleeping.

[0016] II. Install in any position: the utility model adopts three-axis MEMS accelerometer chip, supports three-axis synchronous sampling, adopts three-axis arctangent algorithm to solve angle, three-axis measures three-axis angle output, ensures the tilt angle detection capability of the tilt sensor product in any installation direction, solves the restriction of the installation direction of the existing tilt sensor.

[0017] III. Large range: the utility model utilizes three-axis MEMS accelerometer to detect static tilt angle, and the present technology is through the gravity acceleration component on the axis of accelerometer to obtain the tilt angle value by arccosine function operation, according to the characteristic of sine curve, the greater the angle, the worse the linearity of acceleration and angle, therefore, the method is more suitable for small range calculation, but with the increase of angle, the calculated angle precision slowly deteriorates, and the utility model uses three-axis arctangent algorithm to solve angle, realizes 0.5° measurement precision in ± 90° range.

[0018] IV. Cover-free starting: the utility model designs hall switch circuit to trigger single-chip low-power pulse counting module PCNT, realizes low-power magnet cover-free starting of certain number and trigger sequence. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the circuit principle diagram of the utility model's circuit;

[0020] Figure 2 It is the circuit principle diagram of battery discharge management circuit;

[0021] Figure 3 It is the circuit principle diagram of power switch circuit;

[0022] Figure 4 It is the circuit principle diagram of temperature sensor circuit;

[0023] Figure 5 It is the circuit principle diagram of three-axis accelerometer and supply discharge control circuit;

[0024] Figure 6 It is the circuit principle diagram of single-chip microcomputer and peripheral circuit;

[0025] Figure 7a It is the circuit principle diagram of LoRaWAN module power supply control subcircuit;

[0026] Figure 7bIt is a circuit schematic diagram of LoRaWAN module subcircuit;

[0027] Figure 8a It is a circuit schematic diagram of key subcircuit;

[0028] Figure 8b It is a circuit schematic diagram of indicator light subcircuit;

[0029] Figure 9 It is a circuit schematic diagram of Hall switch circuit;

[0030] Figure 10 It is a working principle flow chart of the utility model;

[0031] Figure 11 It is an angle solution and calibration flow chart. DETAILED DESCRIPTION

[0032] The utility model will be described in detail below in combination with the drawings and specific embodiments. The embodiment is implemented on the premise of the technical scheme of the utility model, and gives detailed implementation mode and specific operation process, but the protection scope of the utility model is not limited to the following examples.

[0033] It should be noted that in the specification, similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0034] In the description of the embodiment, it should be noted that the orientation or position relationship indicated by the terms "upper", "lower", "inner", "bottom" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly used when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the utility model.

[0035] The terms "first", "second" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0036] In the description of the embodiment, it should also be noted that unless otherwise specified and limited, the terms "set", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the embodiment can be understood according to the specific circumstances.

[0037] In order to make the purpose, technical scheme and advantages of the utility model more clear, the embodiments of the utility model will be described in further detail below with reference to the drawings.

[0038] Embodiments

[0039] As Figure 1 shown, the utility model provides a kind of LoRaWAN tilt sensor system of low-power consumption arbitrary position installation, to realize three-axis angle output by three-axis angle solution and six position calibration, and low-power consumption and exempt from opening cover start can be realized, and this system includes single-chip microcomputer, battery discharge management circuit and respectively with the power switch circuit, temperature sensor circuit, three-axis accelerometer and discharge control circuit, LoRaWAN wireless communication module circuit, button and indicator light circuit and Hall switch circuit connected with single-chip microcomputer.

[0040] As Figure 2 shown, battery discharge management circuit includes lithium sub battery BT201, composite pulse capacitor C201, Schottky diode D201, charge-discharge management chip U201, resistance R201, jumper resistance R202 and external power output port P201.

[0041] The negative pole of lithium sub battery BT201 (model number is ER34615 in this example) is grounded, and the positive pole is connected with the No.1 pin of Schottky diode D201, for preventing lithium sub battery BT201 positive and negative pole from being wrongly installed and composite pulse capacitor C201 from charging lithium sub battery BT201 which is not chargeable in reverse direction, composite pulse capacitor C201 is connected between the No.3 pin of Schottky diode D201 and ground, charge-discharge management chip U201, resistance R201 and jumper resistance R202 constitute charge-discharge management module for composite pulse capacitor C201 for preventing composite pulse capacitor C201 from over-discharging, the No.2 pin of charge-discharge management chip U201 is grounded, and is connected with the No.4 pin through jumper resistance R202, the No.4 and No.5 pins are both grounded, and the No.3 pin is connected with Schottky diode D201 No.3 pin and external power output port P201 through resistance R201.

[0042] Battery discharge management circuit as the battery power supply part of the utility model, through the combination of lithium sub battery BT201 and composite pulse capacitor C201, cooperate with low-power consumption charge-discharge management chip U201 (model number is DW02KA in this example), can realize battery life cycle of more than 10 years with extremely low self-discharge rate, and also can load larger current of wireless communication and the like in short time.

[0043] As Figure 3As shown in the power switch circuit, P4 is the power input port for debugging, D5 is an anti-reverse double diode, which provides independent anti-reverse protection for the two-way power supply interface, F1 is a self-resetting fuse, which is arranged between the power input port P4 and the anti-reverse double diode D5, and is used for preventing overcurrent, J2 is a battery power supply interface, which is connected with the external power output port P201 through a wire, and the power output is VDD.

[0044] As shown in the power switch circuit, P4 is the power input port for debugging, D5 is an anti-reverse double diode, which provides independent anti-reverse protection for the two-way power supply interface, F1 is a self-resetting fuse, which is arranged between the power input port P4 and the anti-reverse double diode D5, and is used for preventing overcurrent, J2 is a battery power supply interface, which is connected with the external power output port P201 through a wire, and the power output is VDD. Figure 4 As shown in the temperature sensor circuit, the high-precision temperature sensor chip U2 (in this example, the model is M1820P) adopts a single bus communication interface to communicate with the single-chip microcomputer, and the power supply is controlled by the GPIO interface of the single-chip microcomputer, and the power supply is only turned on during use, and the power supply is turned off during non-use to reduce power consumption, the high-precision temperature sensor chip U2 is used to detect the current temperature of the tilt angle sensor system, and is used for temperature compensation.

[0045] As shown in the power switch circuit, P4 is the power input port for debugging, D5 is an anti-reverse double diode, which provides independent anti-reverse protection for the two-way power supply interface, F1 is a self-resetting fuse, which is arranged between the power input port P4 and the anti-reverse double diode D5, and is used for preventing overcurrent, J2 is a battery power supply interface, which is connected with the external power output port P201 through a wire, and the power output is VDD. Figure 5 As shown in the three-axis accelerometer and power supply and discharge control circuit, the resistor R4, the TVS tube D2 and the capacitor C3 constitute a power supply and discharge control circuit for the three-axis accelerometer which is directly controlled by the single-chip microcomputer, and the power supply is only turned on when the three-axis accelerometer is used, and the power supply is turned off when the three-axis accelerometer is not used to save power. The accelerometer power supply control pin ACC_POWER of the single-chip microcomputer is connected with the power supply end of the three-axis accelerometer through the resistor R4, the TVS tube D2 and the capacitor C3 are connected in parallel, one end is connected between the resistor R4 and the power supply end of the three-axis accelerometer, and the other end is grounded.

[0046] In the utility model, the three-axis MEMS accelerometer chip U10 (in this example, the model is ICM-42370-P) which is the core device of the tilt angle sensor is adopted, the capacitor around the three-axis MEMS accelerometer chip U10 is the power supply bypass and decoupling capacitor of the three-axis MEMS accelerometer chip U10, the three-axis MEMS accelerometer chip U10 is connected with the single-chip microcomputer through the I 2 C interface.

[0047] As shown in the power switch circuit, P4 is the power input port for debugging, D5 is an anti-reverse double diode, which provides independent anti-reverse protection for the two-way power supply interface, F1 is a self-resetting fuse, which is arranged between the power input port P4 and the anti-reverse double diode D5, and is used for preventing overcurrent, J2 is a battery power supply interface, which is connected with the external power output port P201 through a wire, and the power output is VDD. Figure 6 As shown in the single-chip microcomputer and peripheral circuit, Y1 and Y2 are external crystal oscillator chips respectively, Y1 is used for the single-chip microcomputer MCU core, Y2 is used for the low-power RTC real-time clock module in the single-chip microcomputer, and is provided with a load capacitor, C20-C23 are power supply bypass and decoupling capacitors of the single-chip microcomputer chip U3, in this example, the single-chip microcomputer chip U3 adopts a low-power ARM core single-chip microcomputer chip, has extremely low power consumption, and the peripheral devices are its minimum system, J3 is a SWD program burning and debugging interface, J4 is a debugging serial port for product calibration, the single-chip microcomputer chip U3 can reduce power consumption under different working loads through different crystal oscillator frequencies, realizes data acquisition of the three-axis MEMS accelerometer chip U10, the high-precision temperature sensor chip U2 and other chips and calculation of angle and temperature data.

[0048] For example, when the tilt sensor system is in the alarm detection mode (non-sleep mode), only the alarm angle is needed to be detected, at this time, the main frequency of the single-chip microcomputer can be reduced to 1 MHz, and when data transmission and sending are needed, the main frequency of the single-chip microcomputer can be appropriately increased to 16 MHz.

[0049] The LoRaWAN wireless communication module circuit includes a LoRaWAN module power supply control sub-circuit and a LoRaWAN module sub-circuit, as shown in Figure 7a The core devices of the LoRaWAN module power supply control sub-circuit include a PMOS tube Q4 and a transistor Q5, the base of the transistor Q5 is connected with the 21st pin PW_CTL_LR of the single-chip microcomputer chip U3, the collector is grounded, the emitter stage is connected with the gate of the PMOS tube Q4, the source of the PMOS tube Q4 is connected with the LoRaWAN module U5, and the drain is connected with the output end VDD of the power switch circuit, and the rest are decoupling capacitors and TVS diodes to form a power supply bypass to prevent the occurrence of excessive transient voltage in the circuit conduction moment.

[0050] As shown in Figure 7b The LoRaWAN module sub-circuit includes a LoRaWAN module U5 in communication with the single-chip microcomputer chip U3, and an indicator light module, a reset module and an antenna module connected with the LoRaWAN module U5 respectively, the indicator light module is arranged between the 1st and 3rd pins of the LoRaWAN module U5 and the output end of the LoRaWAN module power supply control sub-circuit to indicate the power supply; the reset module includes a reset capacitor C33 and a reset resistor R29, the output end of the LoRaWAN module power supply control sub-circuit is connected with the reset pin of the LoRaWAN module U5 through the reset resistor R29, one end of the reset capacitor C33 is connected with the reset pin of the LoRaWAN module U5, and the other end is grounded; the antenna module includes an antenna connector J5 (in this example, the model is 20279-001E-01) and a matched capacitor and resistor, the LoRaWAN module U5 communicates with the single-chip microcomputer chip U3 through the UART port, and is powered only when communicating, and is powered off when not communicating to realize low power consumption.

[0051] The key and indicator light circuit includes a key sub-circuit and an indicator light sub-circuit, as shown in Figure 8a The key sub-circuit is used to test the manual triggering of the wireless communication function, and includes a key S1, a resistor R23, a capacitor C26 and a resistor R21, the output end of the power switch circuit is connected with the 29th pin RES_KEY of the single-chip microcomputer chip U3 in sequence through the key S1 and the resistor R21, the resistor R23 and the capacitor C26 are connected in parallel, one end is grounded, and the other end is connected between the key S1 and the resistor R21; as shown in Figure 8bAs shown, the indicator sub-circuit includes light emitting diodes D5 and D6 for indicating the working state of the product, one end of the light emitting diode D5 is grounded, and the other end is connected with the No. 28 pin of the single-chip microcomputer chip U3 through the resistor R17, one end of the light emitting diode D6 is grounded, and the other end is connected with the No. 18 pin of the single-chip microcomputer chip U3 through the resistor R18, the key sub-circuit and the indicator sub-circuit will not produce power consumption in the sleep state, and low power consumption can be further realized.

[0052] At present, the product assembly step including the battery of the tilt sensor product has been completed before leaving the factory, in order to reduce the power consumption of the tilt sensor product in the transportation process and ensure the service life of the battery, the tilt sensor product is set to the transportation mode when leaving the factory, that is, the product enters the low power consumption mode, which is different from the sleep state, the low power consumption mode will not be actively awakened, so as to prevent the tilt sensor product from being awakened due to false triggering and other reasons in the transportation process and generating power consumption when trying to enter the network, and the user needs to activate the product to exit the transportation mode after receiving the tilt sensor product.

[0053] Since the existing tilt sensor product is activated by the key switch, in order to avoid the risk of the tilt sensor product being activated by mistake in the transportation process, and to avoid the trouble of the user opening the cover before use after receiving the tilt sensor product, the utility model designs a start switch, and the user only needs to activate the product by using the start switch.

[0054] The utility model designs a kind of activation mode of start switch using single-chip PCNT (in this example, using Huada pulse counting module PCNT) peripheral cooperation, in this example, start switch includes hall switch circuit and external trigger device, such as Figure 9 As shown, the hall switch circuit includes hall switch chip U7, U8, and the peripheral capacitor is decoupling capacitor, the average working current of the hall switch chip is only 2uA, low power consumption is realized, and the external trigger device is usually an external magnet, when activating the tilt sensor product, the external magnet is close to the hall switch chip, the output of the hall switch chip will be reversed, and after being acquired by single-chip PCNT, it is sent to single-chip (No. 23 and No. 30 pins of single-chip microcomputer chip U3) for counting, the utility model uses two hall switch chips (also can set 1 or more according to actual demand, corresponding different trigger times and sequence), and the trigger times and trigger sequence of the two hall switch chips are set in advance in single-chip, when external magnet triggers in the way set in advance (for example, from left to right sequentially across two hall switch chips, etc. Action), low power consumption cover-free activation start can be realized.

[0055] As shown in Figure 10As shown, the utility model realizes is a low precision, arbitrary installation, magnet starting, low power LoRaWAN tilt sensor, so the main flow of the program running in the singlechip chip includes initialization and main loop, in the initialization process, power supply control and initialization of the count singlechip peripheral, three-axis accelerometer, temperature sensor and other elements are completed, after entering the main loop, first is the feeding operation of watchdog, then the power supply voltage of three-axis accelerometer, temperature sensor and singlechip is collected, the angle, temperature and voltage data are solved, then the data is sent to the remote server platform through LoRaWAN module wireless communication again.Sending data is completed, and the tilt sensor will enter the low-power sleep state.The low-power pulse counting module PCNT in the singlechip will count the level change of the hall switch, and will trigger the wake-up singlechip and enter the subsequent flow when the preset condition is reached.The low-power RTC real-time clock module in the singlechip will wake up the system periodically, and the above steps are cycled periodically.The utility model adopts the periodic sleep-wake low-power design of main flow, and the active time of the tilt sensor is reduced as much as possible; by power supply control of temperature sensor, accelerometer chip, LoRaWAN module and other elements, the power supply of these circuits is turned off when not needed, and the working frequency of the singlechip is reduced, and finally the low-power operation of the tilt sensor product is realized, and under the condition of reporting a piece of data for 5 minutes, a ER34615 lithium sub-battery can work for about 8 years, which exceeds the working life of 3-5 years of similar products under the same working conditions.

[0056] As Figure 11 shown, the angle solving and calibration part flow of the utility model first is that the singlechip carries out sampling to three-axis accelerometer through I 2 C interface, then carries out filter processing to the original value collected and filters high-frequency noise and jitter, then applies six-position calibration algorithm to three-axis arctangent algorithm to carry out angle solving, finally carries out factory zero point calibration, and thus completes the whole angle solving and calibration process, and the LoRaWAN tilt sensor of the utility model can realize the installation of any six surfaces and can reach the precision requirement of 0.5°.

[0057] The preferred embodiments of the utility model are described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the utility model without creative labor. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment on the basis of the prior art according to the concept of the utility model should be within the protection scope determined by the claims.

Claims

1. A low power consumption arbitrary position mounted LoRaWAN tilt sensor system, characterized in that, The system comprises a single-chip microcomputer, a battery discharge management circuit, a power switch circuit, a temperature sensor circuit, a three-axis accelerometer, a discharge control circuit and a LoRaWAN wireless communication module circuit connected with the single-chip microcomputer respectively.

2. A low power consumption arbitrary position mounted LoRaWAN tilt sensor system according to claim 1, characterized in that, The battery discharge management circuit comprises a lithium sub-battery (BT201), a charge-discharge management module and an external power supply output port (P201), the charge-discharge management module is composed of a charge-discharge management chip (U201), a resistor (R201) and a jumper resistor (R202), the lithium sub-battery (BT201) is grounded at the negative electrode, and the positive electrode is connected with the charge-discharge management chip (U201) power supply pin and the external power supply output port (P201) through a Schottky diode (D201), and the external power supply output port (P201) is connected with the power switch circuit.

3. A low power consumption arbitrary position mounted LoRaWAN tilt sensor system according to claim 2, characterized in that, The battery discharge management circuit further comprises a composite pulse capacitor (C201), one end of which is grounded, and the other end is connected between the Schottky diode (D201) and the charge-discharge management chip (U201) power supply pin.

4. A low power consumption arbitrary position mounted LoRaWAN tilt sensor system according to claim 2, characterized in that, The power switch circuit comprises a battery power supply interface (J2) connected with the external power supply output port (P201), an anti-reverse connection double diode (D5) and a debugging power input port (P4), the No.1 pin of the anti-reverse connection double diode (D5) is connected with the debugging power input port (P4) through a self-resetting fuse (F1), the No.2 pin is connected with the battery power supply interface (J2), and the No.3 pin is connected with the power output end VDD of the power switch circuit.

5. A low power consumption arbitrary position installed LoRaWAN tilt sensor system according to claim 1, characterized in that, The temperature sensor circuit comprises a temperature sensor chip (U2), which communicates with the single-chip microcomputer through a single bus communication interface and is controlled by the GPIO interface of the single-chip microcomputer.

6. A low power consumption arbitrary position mounted LoRaWAN tilt sensor system according to claim 1, characterized in that, The triaxial accelerometer and the discharge control circuit comprise a triaxial MEMS accelerometer chip (U10) and a discharge control subcircuit, one end of the discharge control subcircuit is connected with an accelerometer power supply control pin of a single-chip microcomputer, the other end is connected with a power supply pin of the triaxial MEMS accelerometer chip (U10), and the triaxial MEMS accelerometer chip (U10) adopts an I 2 The C interface is connected with a single-chip microcomputer for communication, and the single-chip microcomputer calculates and outputs angle data through an arctangent algorithm.

7. A low power consumption arbitrary position installed LoRaWAN tilt sensor system according to claim 1, characterized in that, The single-chip microcomputer is connected with a crystal chip (Y1) used by the single-chip microcomputer MCU core and a crystal chip (Y2) used by a low-power RTC real-time clock module, and different crystal frequencies are set in different working modes corresponding to different working loads to reduce power consumption.

8. The low power consumption arbitrary position mounted LoRaWAN tilt sensor system of claim 1, wherein, The LoRaWAN wireless communication module circuit comprises a LoRaWAN module power supply control sub-circuit and a LoRaWAN module sub-circuit, the LoRaWAN module power supply control sub-circuit comprises a PMOS tube (Q4) and a triode (Q5), the base of the triode (Q5) is connected with the wireless communication module power supply control pin of the single-chip microcomputer, the collector is grounded, the emitter is connected with the gate of the PMOS tube (Q4), the source of the PMOS tube (Q4) is connected with the LoRaWAN module sub-circuit, and the drain is connected with the output end of the power switch circuit.

9. A low power consumption arbitrary position mounted LoRaWAN tilt sensor system according to claim 8, characterized in that, The LoRaWAN module sub-circuit comprises a LoRaWAN module (U5) and an indicator light module, a reset module and an antenna module connected with the LoRaWAN module (U5) respectively.

10. The low power consumption arbitrary position mounted LoRaWAN tilt sensor system of claim 1, wherein, The system further comprises a cover-free starting module, which comprises a Hall switch circuit and a magnet connected with the power switch circuit and the single-chip microcomputer respectively, the Hall switch circuit comprises at least one Hall switch chip, the Hall switch chip is triggered to output and sent to the single-chip microcomputer by the magnet, and the single-chip microcomputer realizes cover-free starting according to a preset trigger sequence and counting.

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