CN213073123U

CN213073123U - Bluetooth sensor and sensor network

Info

Publication number: CN213073123U
Application number: CN202020746458.2U
Authority: CN
Inventors: 谷力刚; 韩永焕
Original assignee: Continental Automotive Changchun Co Ltd
Current assignee: Continental Automotive Changchun Co Ltd
Priority date: 2020-05-08
Filing date: 2020-05-08
Publication date: 2021-04-27
Anticipated expiration: 2030-05-08

Abstract

The utility model discloses a bluetooth sensor, include: control circuit board, last microcontroller and one or more encoding circuit of being provided with of control circuit board, encoding circuit includes the input, the power end, the earthing terminal, control end and sense terminal, the input is unsettled or ground connection, the power end is connected with the power electricity, earthing terminal ground connection, control end and sense terminal are connected with microcontroller electricity respectively, control encoding circuit's switch-on and disconnection, and detect the voltage value of sense terminal, the voltage value that the sense terminal corresponds when the input is unsettled is V1, the voltage value that the sense terminal corresponds when the input ground connection is V2, wherein: v1 ≠ V2, and the microcontroller comprises a transmission terminal for sending a first signal outwards; the antenna is electrically connected with the control circuit board; the shell is sleeved outside the control circuit board. By adopting the technical scheme, the wiring harness is short, convenient to arrange and low in cost in the use process of the Bluetooth sensor. The utility model also discloses a sensor network.

Description

Bluetooth sensor and sensor network

Technical Field

The utility model relates to a sensor field, in particular to bluetooth sensor and sensor network.

Background

Because the bluetooth has the characteristics of working in an ISM (industrial, scientific and medical) frequency band of 2.4GHz, being capable of simultaneously transmitting voice and data, having good anti-interference capability, low power consumption and the like, the bluetooth sensor network consisting of fixed sensor nodes is constructed by adopting the bluetooth technology, is a new research direction in the field of wireless sensors, and can realize the acquisition, processing and sending of information.

At present, the bluetooth sensors are mostly in the form of a sensor network in the use process, and a plurality of bluetooth sensors are arranged at different positions to acquire signals in an omnibearing manner and transmit acquired data to a processor or a controller and the like. The distance between the signal source and the Bluetooth sensor is obtained when the Bluetooth sensor collects signals, and the position of each Bluetooth sensor in the network needs to be known and correspondingly coded in order to determine the position of the signal source, so that the specific position of the signal source is determined by knowing the position of each data collected by the Bluetooth sensor in the subsequent data processing process.

SUMMERY OF THE UTILITY MODEL

The applicant finds that the problems of long wiring harness, difficult arrangement and high cost often exist in the use process of the existing Bluetooth sensor. The applicant further studies and finds that the above problem occurs because the existing bluetooth sensors are usually encoded in a cascade manner during their use, and the bluetooth sensors are often disposed at different positions.

The utility model aims to solve the problem that the bluetooth sensor pencil is long, difficult, with high costs to arrange among the prior art.

In order to solve the above technical problem, an embodiment of the utility model discloses a bluetooth sensor, include: control circuit board, last microcontroller and one or more coding circuit of being provided with of control circuit board, coding circuit includes the input, the power end, the earthing terminal, control end and sense terminal, the unsettled or ground connection of input end, the power end is connected with the power electricity, earthing terminal ground connection, control end and sense terminal are connected with microcontroller electricity respectively, microcontroller is used for controlling coding circuit's switch-on and disconnection, and detect the voltage value of sense terminal, the voltage value that the sense terminal corresponds when the input is unsettled is V1, the voltage value that the sense terminal corresponds when the input ground connection is V2, wherein: v1 ≠ V2, and the microcontroller comprises a transmission terminal used for sending a first signal outwards; the antenna is electrically connected with the control circuit board; the shell is sleeved outside the control circuit board.

By adopting the technical scheme, the Bluetooth sensor has the advantages of short wiring harness, convenience in arrangement and low cost in the use process.

Optionally, the encoding circuit includes a resistor R1, a resistor R2, a resistor R3, and a transistor Q1, an emitter of the transistor Q1 is used as a power supply terminal of the encoding circuit and is electrically connected to a power supply, a base of the transistor Q1 is used as a control terminal of the encoding circuit and is electrically connected to the microcontroller, a collector of the transistor Q1 is connected in series with the resistor R3 and the resistor R2 and then grounded through a ground terminal, two sides of the resistor R1 are respectively used as an input terminal and a detection terminal of the encoding circuit, the detection terminal is disposed at an electrical connection position of the resistor R1, the resistor R2, and the resistor R3, and a resistance value of the resistor R1 is not equal to a resistance.

Optionally, the bluetooth sensor further comprises a plug connector, and the plug connector is fixedly arranged on the control circuit board.

The embodiment of the utility model also discloses a be suitable for bluetooth low energy keyless entry system's sensor network, bluetooth sensor in any preceding embodiment still includes: the sensor network comprises M Bluetooth sensors, each Bluetooth sensor comprises N coding circuits, and M and N satisfy the following relations: 2^N≥M。

Optionally, the power supply terminal of each encoding circuit is electrically connected to the vehicle-mounted power supply of the vehicle.

Optionally, the bus is a LIN bus.

Optionally, both ends along the length direction of the car and both ends along the width direction thereof are provided with bluetooth sensors.

Optionally, the bluetooth sensor is disposed on a metal plate rib of the automobile.

Optionally, the interior of the car is also provided with a bluetooth sensor.

Optionally, M6, N3, two ends along the length direction and two ends along the width direction of the vehicle are provided with one bluetooth sensor, the main controller is disposed at the armrest box of the vehicle, and two bluetooth sensors are disposed inside the vehicle, one of the bluetooth sensors is disposed at the front row cabin of the vehicle, and the other bluetooth sensor is disposed at the rear row cabin of the vehicle.

Drawings

Fig. 1 is a schematic diagram illustrating a module connection of a control circuit board of a bluetooth sensor according to an embodiment of the present invention;

fig. 2 is a perspective view of a bluetooth sensor according to an embodiment of the present invention;

fig. 3 is a schematic diagram illustrating a circuit connection between the encoding circuit and the microcontroller according to an embodiment of the present invention;

fig. 4 shows a schematic connection diagram of a sensor network according to an embodiment of the present invention;

fig. 5 is a top view of an automobile using a sensor network according to an embodiment of the present invention;

fig. 6 shows a side view of an automobile employing a sensor network in an embodiment of the present invention;

fig. 7 is a diagram illustrating a code setting of a bluetooth sensor in a sensor network according to a novel embodiment of the present invention.

Detailed Description

The following description is provided for illustrative embodiments of the present invention, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to only those embodiments. On the contrary, the intention of implementing the novel features described in connection with the embodiments is to cover other alternatives or modifications which may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Furthermore, some of the specific details are omitted from the description so as not to obscure or obscure the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

In the description of the present embodiment, it should be noted that the terms "upper", "inner" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship which is usually placed when the utility model is used, and are only for convenience of describing the utility model and simplifying the description, but do not indicate or imply that the device or the element which is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the utility model.

The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.

In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

As shown in fig. 1 and 2, an embodiment of the present invention provides a bluetooth sensor 1, which includes a control circuit board 11, an antenna (not shown), and a housing 12. The control circuit board 11 is provided with a microcontroller 111 and an encoding circuit 112, and the encoding circuit 112 includes an input terminal 113, a power terminal 114, a ground terminal 115, a control terminal 116, and a detection terminal 117. Input terminal 113 is floating or grounded; the power end 114 is electrically connected to a power source, which may be external or carried by the bluetooth sensor 1, and this embodiment does not limit this; the ground terminal 115 is grounded, and the ground may be a direct ground or an indirect ground, for example, by connecting a metal member, and then grounding the metal member; the control terminal 116 and the detection terminal 117 are electrically connected to the microcontroller 111, respectively, and the microcontroller 111 may be an electronic device such as a single chip microcomputer. The microcontroller 111 is used for controlling the on and off of the encoding circuit 112 and detecting the voltage value of the detection terminal 117, the voltage value corresponding to the detection terminal 117 is V1 when the input terminal 113 is floating, and the voltage value corresponding to the detection terminal 117 is V2 when the input terminal 113 is grounded, wherein: v1 ≠ V2, and the microcontroller 111 includes a transmission terminal 118, and the transmission terminal 118 is used for sending out the first signal. The transmission end 118 can be according to the voltage value that the sense terminal 117 that microcontroller 111 detected corresponds, outwards sends first signal, and first signal both can contain the level information that microcontroller 111 obtained according to the voltage value of the sense terminal 117 that detects, also can contain microcontroller 111 and reachs bluetooth sensor 1 according to the voltage value that detects and correspond coding information that the code obtained etc. the utility model discloses do not do the restriction to this. The antenna is electrically connected with the control circuit board 11; the housing 12 is disposed outside the control circuit board 11.

In the present embodiment, the antenna is electrically connected to the control circuit board 11 for transmitting the signal source information collected by detection to the microcontroller 111. The housing 12 is sleeved outside the control circuit board 11 and is used for accommodating the control circuit board 11 and maintaining the stability of the structure. By designing the corresponding encoding circuit 112 on the control circuit board 11 of the bluetooth sensor 1, designing the input end 113 of the encoding circuit 112 to be suspended or grounded, and using the microcontroller 111 to detect the voltage of the corresponding detection end 117 of the encoding circuit 112 in the bluetooth sensor 1, since V1 ≠ V2, the corresponding bluetooth sensor can be judged according to the difference of the detected voltage values. The code determination of the bluetooth sensor and the transmission of the first signal by the transmission end will be described below by exemplifying several embodiments.

In an embodiment, the positions corresponding to the two bluetooth sensors 1 may be encoded, the bluetooth sensor 1 at the point a is encoded to be 0, the input terminal 113 is designed to be floating, at this time, the voltage value corresponding to the detection terminal 117 of the bluetooth sensor 1 is V1, the bluetooth sensor 1 at the point B is encoded to be 1, the input terminal 113 is designed to be grounded, and the voltage value corresponding to the detection terminal 117 is V2. Therefore, when the two bluetooth sensors 1 are collecting and transmitting signal source information, the microcontroller 111 can determine the corresponding bluetooth sensor 1 according to whether the voltage value of the detection terminal 117 is V1 or V2, that is, whether the code of the bluetooth sensor 1 is 0 or 1, and the position of the code is point a or point B. In other embodiments of the present invention, the microcontroller 111 can also only detect the voltage value of the detecting terminal 117, and does not determine the code corresponding to the bluetooth sensor 1, and the transmitting terminal 118 sends the first signal containing the corresponding level information according to the voltage value, and determines the code corresponding to the bluetooth sensor 1 after receiving the first signal by other devices, such as the main controller. It can be understood that, as long as V1 ≠ V2, it can be determined whether the corresponding state of the input terminal 113 is floating or grounded by distinguishing between different detected voltage values. Since there may be a deviation in the measurement of the voltage value during the actual use process, the specific distinction may be by setting a threshold range, for example, when the voltage value: v1-n is less than or equal to U is less than or equal to V1+ m, the voltage value at the moment is considered to be approximately V1, namely the code of the Bluetooth sensor is 0, and the Bluetooth sensor is positioned at the point A when the voltage value: v2-n is less than or equal to U is less than or equal to V2+ m, the voltage value is considered to be approximately V2 at the moment, namely the code of the Bluetooth sensor is 1, and the Bluetooth sensor is positioned at the point B. Also can be directly set for when U is greater than or equal to L promptly deem that the voltage value is approximate V1 this moment, deem that the voltage value is approximate V2 this moment when U < L, can also adopt other to distinguish the design, as long as can be unsettled to input 113 or ground connection distinguish and judge can, concrete coding circuit structure and input state distinguish and can design according to actual needs, the utility model discloses do not restrict to this. According to the difference of microcontroller 111 design, what microcontroller 111 detected can be specific analog voltage value, also can be digital signal such as 0 or 1 after the conversion, the utility model discloses do not do the restriction to this.

In an embodiment, when the antenna of one bluetooth sensor 1 detects the target signal source, and the voltage of the detection terminal 117 detected by the microcontroller 111 is V2, it can be determined that the corresponding code of the bluetooth sensor 1 is 1. This enables the microcontroller 111 to transmit a signal to the outside, and during the data transmission process, the collected target signal source information and the encoded information of the bluetooth sensor 1 may be packaged to generate a first signal, which is transmitted by the transmission terminal 118. At this time, the receiving end can obtain information that the bluetooth sensor with the code 1 detects the target signal source information, the specific target signal source information can be information such as the distance from the signal source to the detected bluetooth sensor, the receiving end can be a device such as a main controller, and the receiving end can obtain the position of the bluetooth sensor 1 according to the code information and further obtain the position of the target signal source.

In one embodiment, when the antenna of one bluetooth sensor 1 detects the target signal source, the voltage of the detection terminal 117 detected by the microcontroller 111 is V2. During the process of transmitting data, the microcontroller 111 may package the collected target signal source information and the level information corresponding to the voltage value, and transmit the signal as a first signal together from the transmission terminal 118. The level information may be in various forms, and when the bluetooth sensor 1 includes only one encoding circuit 112, the level information may be an analog voltage V2, or may be a converted digital signal such as 0 or 1. When the bluetooth sensor 1 includes a plurality of encoding circuits 112, the level information may include a voltage value of a detection terminal corresponding to each encoding circuit 112. The receiving end can obtain the code corresponding to the bluetooth sensor 1 according to the level information in the first signal, further obtain the position of the bluetooth sensor 1, and finally obtain the position of the target signal source by combining the target signal source information.

In one embodiment, in conjunction with fig. 4, it is understood that the transmitting end 118 is also capable of receiving a second signal sent by another device, such as the main controller 2. Therefore, when the main controller 2 communicates with the bluetooth sensor 1 for the first time, the main controller 2 can judge the corresponding code according to the level information in the first signal, and distribute the code to the bluetooth sensor 1 through the second signal, and then, the corresponding code communication can be continuously maintained.

In the use, input 113 of bluetooth sensor 1 in this embodiment only needs to be unsettled or ground according to the code of design, and simple structure is convenient for arrange, and it is easy to realize. By adopting the technical scheme, the plurality of Bluetooth sensors are connected with the receiving end after being cascaded in order to determine the positions of the Bluetooth sensors in the prior art, so that the problems that the Bluetooth sensors are required to be connected during cascading, the number of required wire harnesses is large, the arrangement is difficult, and the cost is high are solved. Especially for the application scenes with a large number of Bluetooth sensors, the problem of high requirements on encoding time and sequence exists when encoding is carried out in a cascading mode, once a certain Bluetooth sensor is broken down or needs to be replaced at a later stage, the whole sensor network needs to be rearranged and encoded, and the maintenance cost is high.

As shown in fig. 3, another embodiment of the present invention provides a bluetooth sensor 1, optionally comprising a plurality of coding circuits 112, capable of implementing coding configuration of a multi-sensor network. With respect to the foregoing embodiments, each encoding circuit 112 includes a resistor R1, a resistor R2, a resistor R3, and a transistor Q1. The emitter of the transistor Q1 is used as the power supply terminal 114 of the encoding circuit 112 and is electrically connected with the power supply; the base electrode of the transistor Q1 is used as the control end 116 of the coding circuit 112 and is electrically connected with the microcontroller 111; the collector of the transistor Q1 is connected in series with the resistor R3 and the resistor R2 and then grounded through the ground terminal 115; the two sides of the resistor R1 are used as the input terminal 113 and the detection terminal 117 of the encoding circuit 112, respectively. The detection terminal 117 is disposed at an electrical connection position of the resistor R1, the resistor R2, and the resistor R3, and the resistances of the resistor R1 and the resistor R2 are not equal to each other. In this embodiment, the coding circuit 112 is designed by using common circuit devices such as transistors and resistors. In the bluetooth sensor disclosed in this embodiment, when the voltage value of the power supply terminal is VBD, and the input terminal is suspended, V1 corresponding to the detection terminal is VBD × R2/(R2+ R3), and V2 corresponding to the detection terminal is VBD × R1/(R1+ R3) when the input terminal is grounded. Therefore, as long as the resistance values of R1 and R2 are not equal, V1 is not equal to V2, the structure is simple, and the assembly is easy.

As shown in fig. 2, another embodiment of the present invention further provides a bluetooth sensor 1, which further includes a connector 13, and the connector 13 is fixedly disposed on the control circuit board 11. The bluetooth sensor in this embodiment is convenient for the bluetooth sensor's in the use fixed and power supply access.

As shown in fig. 4-6, the present invention further provides a sensor network suitable for a bluetooth low energy keyless entry system, including the bluetooth sensor 1 in any of the foregoing embodiments, further including: the sensor network comprises M Bluetooth sensors 1, each Bluetooth sensor 1 comprises N coding circuits 112, and M and N satisfy the following relations: 2^NMore than or equal to M. With the improvement of living standard of people, automobiles become an indispensable part of life of people, so that the requirements on the operation convenience and comfort of the automobiles are gradually improved, and the traditional remote control unlocking function is gradually replaced by a keyless entry and starting system. Furthermore, the keyless entry and start system is gradually developed from a traditional RF/LF-based mode to a bluetooth low energy-based mode in recent years to form a new bluetooth low energy-based keyless entry and start system (BLE PEPS).

In an embodiment, taking a BLE PEPS system of an automobile as an example, the bluetooth sensor 1 and the master controller 2 cooperate with each other to form a sensor network together. The Bluetooth sensor 1 senses and detects a corresponding target signal source, namely intelligent equipment used as an automobile key, such as a mobile phone, an electronic key, an intelligent bracelet and the like, and the distance between the intelligent equipment and the Bluetooth sensor 1,the main controller 2 determines the position of the corresponding intelligent device according to the information in the first signal sent by the transmission terminal 118 of the bluetooth sensor 1 received through the bus, so as to realize functions such as intelligent entry and/or startup. The position of the main controller 2 can be designed according to the needs, and this embodiment is not limited to this. The bus CAN be either a LIN line or a CAN line. The sensor network comprises M bluetooth sensors 1, and the number N of the encoding circuits 112 on each sensor satisfies: 2^NThe relation of being more than or equal to M, thereby ensuring that the coding of each Bluetooth sensor 1 can be completed by designing the state of each coding electric input end 113, and the coding corresponds to the Bluetooth sensors 1 and the placing positions thereof one by one. Therefore, the main controller 2 can determine the position of the bluetooth sensor 1 according to the level information or the code information of the corresponding bluetooth sensor 1 in the received first signal, and further determine the position of the smart device according to the distance between the smart device and the bluetooth sensor 1. For the automobile, when the input terminal 113 of the bluetooth sensor 1 needs to be grounded, it is only necessary to connect to the sheet metal rib of the automobile body with a wire harness. Therefore, adopt the utility model discloses an arbitrary embodiment need not be like among the prior art, in order to confirm bluetooth sensor's position, is connected with main control unit after cascading a plurality of bluetooth sensors. Because the bluetooth sensors need to be connected during cascading, a plurality of wire harnesses are needed, the arrangement is difficult, the cost is high, and not only CAN a CAN wire but also a LIN wire is needed to complete cascading, so that the cost is high. And the data transmission between the main controller and the Bluetooth sensor can be finished by using one bus without using an additional I/O port. Especially when the sensor network needs to arrange the bluetooth sensors in multiple directions, the bluetooth sensors in the prior art need a large number of wire harnesses to wind the devices applying the sensor network, such as the automobile completes cascade connection, and the requirements on coding time and sequence are high, once a certain bluetooth sensor 1 is broken down or needs to be replaced at a later stage, the whole sensor network needs to be rearranged and coded, and the maintenance cost is high. In the present embodiment, when a plurality of encoder circuits 112 are present in the bluetooth sensor 1, the specific structure of the encoder circuits 112, for exampleThe selection of the resistors and the like can be the same or different, and can be selected according to the design requirement. Preferably, the specific structure of all the encoding circuits 112 is kept consistent, so that the stability of the microcontroller 111 in detecting the voltage can be improved.

The sensor network disclosed by the embodiment realizes the advantages of simple structure of the Bluetooth sensor, short wiring harness, convenience in arrangement and low cost in the using process, is convenient for the layout and design of the sensor network, and is particularly suitable for a low-power Bluetooth keyless entry system.

Another embodiment of the present invention provides a sensor network, wherein, compared to the previous embodiment, the power source terminal 114 of each encoding circuit 112 is electrically connected to the vehicle-mounted power source of the vehicle. In this embodiment, the vehicle-mounted power supply provides stable voltage for the encoding circuit 112, so the bluetooth sensor does not need to be provided with a power supply inside, the size of the bluetooth sensor is convenient to reduce, an additional power supply is not needed to supply power, and the cost is reduced. The rated voltage of the vehicle-mounted power supply may be 12V, 36V, or the like, and this embodiment does not limit this.

In a further embodiment of the present invention, a sensor network is provided, in which, in contrast to the previous embodiments, the bus is a LIN bus. The LIN wire is used as one of the buses, has the effect of low cost, and can ensure the realization of functions and reduce the cost for the Bluetooth sensor network of the automobile. The utility model discloses an among another embodiment, the bus is the CAN line, to the higher car of follow-up function extension requirement, adopts the CAN line more suitable, is convenient for carry out the function extension.

As shown in fig. 5, another embodiment of the present invention provides a sensor network, in which, compared to the previous embodiment, bluetooth sensors 1 are disposed at both ends in the car length direction (shown in the X direction) and both ends in the car width direction (shown in the Y direction). In the practical application process, due to the difference of the automobile placement positions and the difference of geographic environments, the route of the intelligent device close to the automobile is often uncertain. Therefore, when all setting up bluetooth sensor 1 around the car, can follow being close to of the comprehensive perception smart machine in a plurality of position, the car of being convenient for in time gets into the preparation state, promotes the performance of car BLE PEPS system, has promoted user experience.

As shown in fig. 5 and 6, another embodiment of the present invention provides a sensor network, and compared with the previous embodiment, the bluetooth sensor 1 can be disposed on a metal plate rib of an automobile. The input 113 state that the encoder circuit 112 of bluetooth sensor 1 corresponds is unsettled or ground connection, and to ground connection, because the structure of car makes all be provided with large tracts of land sheet metal muscle on the automobile body of car generally, consequently with bluetooth sensor setting on the sheet metal muscle of car, can easily realize ground connection nearby simply, reduced the quantity and the length of pencil, the cost is reduced.

As shown in fig. 5 and 6, another embodiment of the present invention provides a sensor network, and compared with the previous embodiment, the inside of the automobile can be provided with the bluetooth sensor 1. Through all setting up bluetooth sensor 1 inside and outside the car, outside bluetooth sensor can be used for the intelligent equipment of perception mandate, and within the scope is predetermineeing near the car as intelligent equipment, the car just realizes opening the door automatically, leaves the scope of predetermineeing as intelligent equipment, then door automatic locking. And inside bluetooth sensor can the perception smart machine whether in the car to and the position that corresponds at the car, realize the start-up of car, or smart machine forget functions such as remind. In this embodiment, through all setting up bluetooth sensor inside and outside the car, can completely realize the automation of car promptly through a main control unit 2 and open the door and function such as start, promoted user experience.

As shown in fig. 4 to 6, another embodiment of the present invention further provides a sensor network, in comparison with the previous embodiment, M is 6, N is 3, two bluetooth sensors 1 are disposed at two ends in the length direction of the vehicle (X direction shown in fig. 5) and two ends in the width direction of the vehicle (Y direction shown in fig. 5), and a main controller 2 is disposed at the armrest box of the vehicle. It is understood that the console box of the automobile is often disposed in the middle of the seat of the front row cabin. The inside of car is provided with two bluetooth sensor 1, and one of them bluetooth sensor 1 sets up in the front row passenger cabin department of car, and another sets up in the back row passenger cabin department of car. For a common automobile, especially a car with a high-application BLE PEPS system, six sensors can meet the design requirement, so that M ═ 6 can save the cost. And when being 6 to M, N is 3, and encoding circuit 112 has been can satisfy bluetooth sensor 1's coding requirement, does not set up more quantity of encoding circuit 112, can practice thrift the cost, simplifies the structure, and has reduced bluetooth sensor 1's volume.

Every bluetooth sensor 1 all is provided with 3 coding circuit, contains 3 input promptly, is input one, input two, input three respectively. The specific codes and settings can be various, and in one embodiment, the settings and codes for 8 bluetooth sensors at most can be completed as shown in fig. 7 with reference to the codes in fig. 7. In this embodiment, 6 codes can be arbitrarily selected from 8 codes, and the remaining 2 codes are correspondingly used when the subsequent expansion is performed. Wherein, the outside front and back of car is provided with a bluetooth sensor 1 respectively about for the position of perception smart machine opens or locks the door. Two bluetooth sensor 1 inside the car mainly used detect whether smart machine has placed in the car to start the car. Set up car main control unit 2 in handrail case department, inside bluetooth sensor 1 sets up in front passenger cabin department, and another bluetooth sensor 1 sets up in back passenger cabin department, can enough perceive the smart machine in the car, can reduce the pencil length between main control unit 2 and the bluetooth sensor 1 again, is convenient for arrange, practices thrift the cost. And can completely detect the smart machine in the car through the bluetooth sensor of a head-to-tail, promote user's use and experience.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, and the specific embodiments thereof are not to be considered as limiting. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A Bluetooth sensor, comprising:

the control circuit board is provided with a microcontroller and one or more coding circuits, each coding circuit comprises an input end, a power end, a grounding end, a control end and a detection end, the input end is suspended or grounded, the power end is electrically connected with the power supply, the grounding end is grounded, the control end and the detection end are respectively electrically connected with the microcontroller, the microcontroller is used for controlling the connection and disconnection of the coding circuits and detecting the voltage value of the detection end, the voltage value corresponding to the detection end is V1 when the input end is suspended, and the voltage value corresponding to the detection end is V2 when the input end is grounded, wherein: v1 ≠ V2, and the microcontroller comprises a transmission terminal for sending a first signal outwards;

the antenna is electrically connected with the control circuit board;

the shell is sleeved outside the control circuit board.

2. The bluetooth sensor as claimed in claim 1, wherein the encoding circuit includes a resistor R1, a resistor R2, a resistor R3, and a transistor Q1, an emitter of the transistor Q1 is used as a power supply terminal of the encoding circuit and is electrically connected to the power supply, a base of the transistor Q1 is used as a control terminal of the encoding circuit and is electrically connected to the microcontroller, a collector of the transistor Q1 is connected in series with the resistor R3 and the resistor R2 and then is grounded via the ground terminal, two sides of the resistor R1 are respectively used as an input terminal and a detection terminal of the encoding circuit, the detection terminal is disposed at an electrical connection position of the resistor R1, the resistor R2 and the resistor R3, and resistances of the resistor R1 and the resistor R2 are not equal.

3. The bluetooth sensor of claim 2, wherein the bluetooth sensor further comprises a plug connector fixedly disposed on the control circuit board.

4. A sensor network adapted for bluetooth low energy keyless entry system, comprising a bluetooth sensor according to any of claims 1-3, further comprising: the sensor network comprises M Bluetooth sensors, each Bluetooth sensor comprises N coding circuits, and M and N satisfy the following relations: 2^N≥M。

5. The sensor network of claim 4, wherein the power terminal of each of the encoding circuits is adapted to be electrically connected to an onboard power source of an automobile.

6. The sensor network of claim 5, wherein the bus is a LIN bus.

7. The sensor network according to claim 5, wherein the Bluetooth sensors are provided along both ends of the automobile in a length direction and both ends thereof in a width direction.

8. The sensor network of claim 7, wherein the bluetooth sensors are disposed on a sheet metal bar of the automobile.

9. A sensor network according to claim 7, wherein the interior of the car is also provided with the Bluetooth sensor.

10. The sensor network of claim 9, wherein M is 6 and N is 3, one of the bluetooth sensors is disposed at both ends in a length direction and both ends in a width direction of the vehicle, the main controller is disposed at a console box of the vehicle, and two of the bluetooth sensors are disposed inside the vehicle, one of the bluetooth sensors is disposed at a front passenger compartment of the vehicle and the other is disposed at a rear passenger compartment of the vehicle.