CN108876978A - A kind of security system based on MEMS sensor - Google Patents
A kind of security system based on MEMS sensor Download PDFInfo
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- CN108876978A CN108876978A CN201810383190.8A CN201810383190A CN108876978A CN 108876978 A CN108876978 A CN 108876978A CN 201810383190 A CN201810383190 A CN 201810383190A CN 108876978 A CN108876978 A CN 108876978A
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- 230000001133 acceleration Effects 0.000 claims abstract description 4
- 238000002955 isolation Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000005669 field effect Effects 0.000 claims description 4
- 230000009466 transformation Effects 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 13
- 230000006870 function Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 241001062009 Indigofera Species 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00571—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by interacting with a central unit
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- H04B5/48—
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00896—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys specially adapted for particular uses
- G07C2009/00928—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys specially adapted for particular uses for garage doors
Abstract
The present invention discloses a kind of security system based on MEMS sensor, the present invention relates to stereo garage technical fields, it solves the existing stereo garage access control system of the prior art there are closed states low without feedback control, control precision, be easy to be influenced and cannot adjust back etc. technical problems by circuit line voltage transformation.Including main controller：Pulse signal is received and/or sent, including the first Bluetooth signal R-T unit, receives and/or send Bluetooth signal；Intelligent terminal with Bluetooth signal transmission-receiving function：Receive and/or send Bluetooth signal；Second Bluetooth signal R-T unit：Receive and/or send Bluetooth signal, feedback pulse signal to main controller；The intelligent gate valve being connect with main controller；MEMS acceleration transducer acquires solenoid valve current state and feedback states signal to programmed logic gate array, and programmed logic gate array corresponds to feedback states signal output state clock signal to main controller, and main controller is selectively adjusted intelligent gate valve.The present invention is used for stereo garage Design of Safeguard System.
Description
Technical field
The present invention relates to stereo garage technical fields, and in particular to a kind of security system based on MEMS sensor.
Background technique
Existing stereo garage access control system generally uses the technical solution of magnetic card and card reader；When stereo garage has vehicle
When inlet/outlet, for interior user, it is inconvenient to there is enabling, and entrance is be easy to cause to block；It is unfavorable for there are physical disturbances
Resident's in-and-out stereo garage door alone；Existing magnetic card stereo garage access control system durability degree is very low, magnetic card easily it is affected by environment and
Demagnetization；Safety does not achieve the desired results, and magnetic card is easy to be replicated, and magnetic card is after the loss, for all stereoscopic vehicles
It is replaced all magnetic cards and a large amount of inessential costs will cause to property with causing potentially to influence per family in library；Card reader needs
For a long time, it is powered in real time, causes waste of energy and increases use cost.Meanwhile a small number of stereo garages use fingerprint recognition machine, at
This is high and unhygienic, does not have preferable feasibility.In addition, stereo garage also lacks state feedback.
Summary of the invention
For the above-mentioned prior art, it is an object of that present invention to provide a kind of security systems based on MEMS sensor, solve
The existing stereo garage access control system of the prior art there are closed state without feedback control, control precision it is low, be easy by circuit line
Voltage transformation is influenced and cannot be adjusted back, and security reliability is poor, and system power dissipation is high, and humanization level is lower and the skills such as poor user experience
Art problem.Control of bluetooth access communication and BluetoothTM domain positioning generation technology enlightenment of this programme to being installed in automobile.
In order to achieve the above objectives, the technical solution adopted by the present invention is as follows：
A kind of security system based on MEMS sensor, including main controller：Pulse signal is received and/or sends, including the
One Bluetooth signal R-T unit receives and/or sends Bluetooth signal；Intelligent terminal with Bluetooth signal transmission-receiving function：It receives
And/or send Bluetooth signal；Second Bluetooth signal R-T unit：Receive and/or send Bluetooth signal, feedback pulse signal to master
Control machine；The intelligent gate valve being connect with main controller：Including solenoid valve；Wherein, pulse signal includes bluetooth pulse signal and calls out
Awake pulse signal；Intelligent terminal is carried by user.Intelligent terminal is carried by interior user；
Wherein, MEMS acceleration transducer acquisition solenoid valve current state simultaneously compile to programmed logic gate array by feedback states signal
Journey logic gate array corresponds to feedback states signal output state clock signal to main controller, and main controller is selectively adjusted intelligent door
Valve.
Detailed description of the invention
Fig. 1 is module connection figure of the invention；
Fig. 2 is a kind of specific embodiment of the first Bluetooth signal R-T unit of the invention；
Fig. 3 is a kind of specific embodiment of main controller of the present invention and intelligent gate valve；
In figure：100- main controller, 200- intelligence gate valve, 300- intelligent terminal, 1,2,3,4- Bluetooth signal R-T unit,
Bluetooth signal_x- Bluetooth signal BS_x, Pulse Signal_x- pulse signal PS_x, Rx- resistance, Cx- capacitor,
L1- antenna, S1- RF switch, Qx, Dx- transistor, the bluetooth pulse input end of RXD_x- processor, TXD_x- processor
Bluetooth pulse output end, A1-555 timer, Um, Un- buffer register, U2A, Ur, U5- phase inverter, U1A- schmidt trigger
Device, U1- single-chip microcontroller, X1- crystal oscillator (x=1,2,3 ...).
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
The present invention will be further described with reference to the accompanying drawing：
Embodiment 1
A kind of security system based on MEMS sensor, including main controller：Pulse signal is received and/or sends, including the
One Bluetooth signal R-T unit receives and/or sends Bluetooth signal；Intelligent terminal with Bluetooth signal transmission-receiving function：It receives
And/or send Bluetooth signal；Second Bluetooth signal R-T unit：Receive and/or send Bluetooth signal, feedback pulse signal to master
Control machine；The intelligent gate valve being connect with main controller：Including solenoid valve；Pulse signal includes bluetooth pulse signal and wake-up pulse
Signal；Intelligent terminal is carried by user.
In above scheme, it is preferable that the intelligent terminal, including mobile phone, tablet computer and/or intelligent wearable device.
It is common, it is not easy to forget to wear, and concerned degree is high, it is not easy to lose.
It further include third Bluetooth signal R-T unit in above scheme：Receive and/or send Bluetooth signal, feedback pulse
Signal is to main controller；4th Bluetooth signal R-T unit：Receive and/or send Bluetooth signal, feedback pulse signal to main controller.
Since Bluetooth signal wave attenuation range is affected by environment, envelope is irregular ellipse, Bluetooth signal R-T unit mostly
It is more, more preferable, more sensitive signal detection, matching can be obtained.
In above scheme, it is preferable that the first Bluetooth signal R-T unit and/or the second Bluetooth signal R-T unit
And/or third Bluetooth signal R-T unit and/or the 4th Bluetooth signal R-T unit, the installation side arranged using annular spread
Formula is used to form intelligent recognition area.Second Bluetooth signal R-T unit and/or third Bluetooth signal R-T unit and/or the 4th
Bluetooth signal provides in detection range, matches with intelligent terminal, carries out bluetooth communication, while exporting wake-up pulse signal extremely
Main controller；Matching in advance is provided, when no vehicle enters and leaves, main controller is in silent state, i.e. main power consumption chip does not access electricity
Source, save the cost；It is matched again without waiting for vehicle close to main controller, has saved vehicle access time, improve access door effect
Rate.
In above scheme, it is preferable that the first Bluetooth signal R-T unit and/or the second Bluetooth signal R-T unit
And/or third Bluetooth signal R-T unit and/or the 4th Bluetooth signal R-T unit, including antenna：Receive and/or send bluetooth
Signal and reception and/or transmission high frequency voltage；Input isolation match circuit：Receiving antenna output high voltage signal；Schmidt
Trigger：The output end of its input terminal connection input isolation match circuit；First phase inverter：Its input terminal connects schmidt trigger
The output end and output wake-up pulse signal of device；Output isolation match circuit：The bluetooth pulse signal of main controller is received, is sent high
Frequency voltage signal is to antenna.Input isolation match circuit and output isolation match circuit, circuit have good independence, can
Independent encryption coding is carried, improper access is limited from circuit hardware, copy-resistant significantly improves；Schmidt trigger and
One phase inverter provides output wake-up pulse signal, limits plant-grid connection power dissipating chip, reduces chip and uses the time, increases durable
Degree, save the cost；Significantly improve security reliability.
In above scheme, it is preferable that the first Bluetooth signal R-T unit and/or the second Bluetooth signal R-T unit
And/or third Bluetooth signal R-T unit and/or the 4th Bluetooth signal R-T unit, further include RF switch, RF switch by
It controls in control switch triode, control switch transistor base connects the control terminal of processor in main controller.Realize zero setting behaviour
Make and resets.
In above scheme, it is preferable that the first Bluetooth signal R-T unit, further includes first for lock-out pulse
Buffer register and/or the second buffer register：The output end of its input terminal connection input isolation match circuit；With the first buffering
The timing circuit of the output end of register and/or the second buffer register connection：Including the second phase inverter and 555 timings
Device；The input terminal of second phase inverter connects the output end of the first buffer register；555 timers：Its high electrical input connection the
The output end and output bluetooth pulse signal of two phase inverters.Timing circuit is that the first Bluetooth signal R-T unit is exclusive, is eliminated blue
A phenomenon is opened by mistake brought by the scrambling of tooth signal attenuation range, that is, intelligent terminal is received and dispatched close to the second Bluetooth signal and filled
It sets and/or third Bluetooth signal R-T unit and/or the 4th Bluetooth signal R-T unit, pre-matching can be triggered and wake up master control
Machine, but when having intelligent terminal only close to the first Bluetooth signal R-T unit, intelligent terminal issues bluetooth signal intensity can be same
When the high electrical input of 555 timers and low electrical input are connected, triggering is opened the door；Once matched when user uses for the first time
It is right, hereafter, will be unblocked by stereo garage gate inhibition as long as opening bluetooth, realize stereo garage doorway without stop,
Improve access door efficiency.
In above scheme, the main controller, including power supply；Nor gate：Receive the indigo plant of Bluetooth signal R-T unit output
Tooth pulse signal；Third phase inverter：The output end of its input terminal connection nor gate；Switching field effect transistor：Its connection power supply that drains
And the output end of grid connection third phase inverter；Processor：The source electrode of power end connection switch field-effect tube, including bluetooth
Pulse signal inputs and/or outputs interface；First triode：Its base stage connects the output end of processor and collector connection electricity
Source；Second triode：Its emitter ground connection and base stage connect the emitter of the first triode；Zener diode：The connection of its cathode
The collector of power supply and anode the second triode of connection.Power consumption element being capable of the access of interval adaptive type and disconnection power supply.
In above scheme, it is preferable that the processor, including central processing unit, function admirable, function are numerous.
In above scheme, it is preferable that the processor, including single-chip microcontroller, it is low in energy consumption, it is low in cost, it realizes simple.
In above scheme, the intelligent gate valve further includes motor and the friendship that simply connected series loop is constituted with solenoid valve
Galvanic electricity source.
In above scheme, it is preferable that the intelligent gate valve further includes the fuse being connected in simply connected circuit, keeps away
Exempt from component caused by causing electric motor short circuit to overheat as electronic bolt delay machine to lose.
In above scheme, it is preferable that the intelligent terminal, including fingerprint identification device, for Bluetooth signal transmitting-receiving
Switch.User starts bluetooth by fingerprint identification device, provides two steps card even if intelligent terminal is lost and picks up taker also not
It is able to carry out enabling；Further increase intelligent entrance guard security level, and clean hygiene.
In above scheme, it is preferable that the main controller further includes multiplexer, receives the by multiplexer
One Bluetooth signal R-T unit and/or the second Bluetooth signal R-T unit and/or third Bluetooth signal R-T unit and/or the 4th
The bluetooth pulse signal of Bluetooth signal R-T unit output.Provide Comprehensive Signal Processing mode.
In above scheme, it is preferable that the processor selects ARM framework Cortex-M3 core single-chip microcontroller；Described
One Bluetooth signal R-T unit and/or the second Bluetooth signal R-T unit, including low-power consumption CC2540 bluetooth single crystalline chip.
CC2540 is the SoC of a super low consumpting power, it incorporate comprising microcontroller, host side and application program in
On one element, in conjunction with reinforced 8051 microcontroller of excellent a less radio-frequency transmission receiver and an industrial standard
Device, it includes the periphery for connecting class when numerical digit inductor, the flash memory of built-in programmable, accurate radio frequency signal
Intensity instruction, built-in AES-128 crypto engine；CC254 can allow strong master control or slave mode node to be established with very low cost
Get up, it has conversion time of short duration between very low sleep pattern power consumption and different working modes, is applicable to surpass
The system of low consumpting power.
Embodiment 2
Fig. 1 is module connection figure of the invention, a kind of security system based on MEMS sensor, including main controller 100：It receives
And/or pulse signal is sent, including the first Bluetooth signal R-T unit 1, receive and/or send Bluetooth signal；With indigo plant
The intelligent terminal 300 of tooth signal transmitting and receiving function：Receive and/or send Bluetooth signal；Second Bluetooth signal R-T unit 2：It receives
And/or send Bluetooth signal, feedback pulse signal to main controller 100；The intelligent gate valve 200 being connect with main controller 100：Wherein wrap
Include solenoid valve S2；
Wherein, pulse signal includes bluetooth pulse signal and wake-up pulse signal；
Wherein, MEMS acceleration transducer acquisition solenoid valve S2 current state and feedback states signal is to programmed logic gate array,
Programmed logic gate array corresponds to feedback states signal output state clock signal to main controller（100）, main controller（100）Selectively
Adjust intelligent gate valve（200）.
Stereo garage is in the east, and the first Bluetooth signal R-T unit 1 is installed in main controller 100, and with master
Control machine 100 is installed on stereo garage doorway together, controls intelligent gate valve 200；Second Bluetooth signal R-T unit 2, is installed on west
Block, optional installation site can be ground, electric light bar surface；Third Bluetooth signal R-T unit 3 and the 4th Bluetooth signal
R-T unit 4 is respectively arranged in North Street area and South Street is gone；The resident for carrying intelligent terminal 300 prepares to enter stereoscopic vehicle from North Street area
Library, intelligent terminal 300 are matched with third Bluetooth signal R-T unit 3 first, while wake-up pulse signal PS_3 is sent to
Main controller 100, the main controller 100 after wake-up, which starts the bluetooth pulse that verifying is matched to by bluetooth pulse input end RXD_3, to be believed
Number in centering intelligent terminal 300 after main controller 100, realize enter stereo garage opening door operation.
Match circuit 400 is isolated in the input, and including the first inductance L2 and first capacitor C1 in parallel, one end connection is penetrated
Frequency switch S1, the other end connect the second inductance L3, the second capacitor C2 connecting with the second inductance L3, second another termination of capacitor C2
Ground；Third capacitor C3 series connection third inductance L4；Third capacitor C3 the first inductance of connection L2, third inductance L4 ground connection.Input matching
Circuit arrangement is without being limited thereto, actually can be according to user demand, and cost limitation, security level and spectrum requirement carry out reasonable technology
Selection.
The processor, suitable for MCU, DSP, CPU or GPU, the RISC Architecture of APU, ARM or x86 framework, CPLD
Or FPGA technology selection.
Match circuit 500, the 4th capacitor C4 of one end ground connection is isolated in the output:Receive the indigo plant that main controller 100 exports
Tooth pulse signal；4th inductance L5：Receive the bluetooth pulse signal that main controller 100 exports；Fiveth in parallel with the 4th capacitor C4
Capacitor C5；Concatenated 5th inductance L6, the 6th capacitor C6 and the 7th capacitor C7：The 5th capacitor C5 of parallel connection；Connect with the 7th capacitor C7
The 6th inductance L7 connect：Bluetooth signal is exported to antenna L1 by RF switch S1.Output matching circuit scheme is without being limited thereto, real
Border can be according to user demand, and cost limitation, security level and spectrum requirement carry out the reasonable choice of technology.
The timing circuit 555 further includes isolator and the second Schmidt trigger for the denoising of waveform tail portion.The
One buffer register Um and the second buffer register Un are exported to isolator, and 555 timer A1 are exported to the second schmidt trigger
The input terminal of device, removes waveform tail portion zero passage noise, and an accuracy is opened or closed to further lifting system.
Compared with prior art, beneficial effects of the present invention：
Significantly and substantially, system security reliability is improved；It is fed back with state, reduces failure rate and lifting stereo garage
The control precision of gate inhibition, reduces power consumption element electric cost and holding time, improves system durability degree；It is significantly and substantive
Ground, the user experience is improved and system humanization level is fully to meet the user demand of continuous improvement.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Belong to those skilled in the art in the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, all answers
It is included within the scope of the present invention.
Claims (10)
1. a kind of security system based on MEMS sensor, which is characterized in that including
Main controller（100）：It receives and/or sends pulse signal, including the first Bluetooth signal R-T unit（1）, receive and/
Or send Bluetooth signal；
Intelligent terminal with Bluetooth signal transmission-receiving function（300）：Receive and/or send Bluetooth signal；
Second Bluetooth signal R-T unit（2）：Receive and/or send Bluetooth signal, feedback pulse signal to main controller（100）；
With main controller（100）The intelligent gate valve of connection（200）：Add including solenoid valve S2, programmed logic gate array and MEMS
Velocity sensor；
Wherein, pulse signal includes bluetooth pulse signal and wake-up pulse signal；
Wherein, MEMS acceleration transducer acquisition solenoid valve S2 current state and feedback states signal is to programmed logic gate array,
Programmed logic gate array corresponds to feedback states signal output state clock signal to main controller（100）, main controller（100）Selectively
Adjust intelligent gate valve（200）.
2. a kind of security system based on MEMS sensor according to claim 1, which is characterized in that further include
Third Bluetooth signal R-T unit（3）：Receive and/or send Bluetooth signal, feedback pulse signal to main controller（100）；
4th Bluetooth signal R-T unit（4）：Receive and/or send Bluetooth signal, feedback pulse signal to main controller（100）.
3. a kind of security system based on MEMS sensor according to claim 2, which is characterized in that described first is blue
Tooth signal receiving/transmission device（1）And/or the second Bluetooth signal R-T unit（2）And/or third Bluetooth signal R-T unit（3）With/
Or the 4th Bluetooth signal R-T unit（4）, using the mounting means of annular spread arrangement, it is used to form intelligent recognition area.
4. a kind of security system based on MEMS sensor according to claim 3, which is characterized in that described first is blue
Tooth signal receiving/transmission device（1）And/or the second Bluetooth signal R-T unit（2）And/or third Bluetooth signal R-T unit（3）With/
Or the 4th Bluetooth signal R-T unit（4）, including
Antenna L1：It receives and/or sends Bluetooth signal and receive and/or send high frequency voltage；
Input isolation match circuit (400)：Receiving antenna L1 output high voltage signal；
Schmidt trigger U1A：The output end of its input terminal connection input isolation match circuit (400)；
First phase inverter U2A：Its input terminal connects the output end of Schmidt trigger U1A and output wake-up pulse signal；
Output isolation match circuit（500）：Receive main controller（100）Bluetooth pulse signal, send high-frequency voltage signal to day
Line L1.
5. a kind of security system based on MEMS sensor according to claim 4, which is characterized in that described first is blue
Tooth signal receiving/transmission device（1）, further include
The first buffer register Um and/or the second buffer register Un for lock-out pulse：The connection input isolation of its input terminal
The output end of match circuit (400)；
The timing circuit being connect with the output end of the first buffer register Um and/or the second buffer register Un（555）：Wherein wrap
Include the second phase inverter Ur and 555 timer A1；
The input terminal of second phase inverter Ur connects the output end of the first buffer register Um；
555 timer A1：The output end and output bluetooth pulse signal of its second phase inverter of high electrical input THR connection Ur.
6. a kind of security system based on MEMS sensor according to claim 1, which is characterized in that the main controller
（100）, including power supply VCC；
Nor gate U4：Receive the bluetooth pulse signal of Bluetooth signal R-T unit output；
Third phase inverter U5：The output end of its input terminal connection nor gate U4；
Switching field effect transistor Q2：The output end of its drain connection power supply VCC and grid connection third phase inverter U5；
Processor：The source electrode of power end connection switch field-effect tube Q2 connects including bluetooth pulse signal input and/or output
Mouthful；
First triode Q3：Its base stage connects the output end of processor and collector connects power supply VCC；
Second triode Q4：Its emitter ground connection and base stage connect the emitter of the first triode Q3；
Zener diode D1：Its cathode connects the collector of power supply VCC and the second triode Q4 of anode connection.
7. a kind of security system based on MEMS sensor according to claim 1, which is characterized in that the intelligent door
Valve（200）, further include the motor K1 and AC power source V1 that simply connected series loop is constituted with solenoid valve S2.
8. a kind of security system based on MEMS sensor according to claim 1, which is characterized in that the intelligence is eventually
End（300）, including fingerprint identification device, the switch for Bluetooth signal transmitting-receiving.
9. a kind of security system based on MEMS sensor according to claim 1, which is characterized in that the main controller
（100）, further include multiplexer, the first Bluetooth signal R-T unit received by multiplexer（1）And/or second bluetooth
Signal receiving/transmission device（2）And/or third Bluetooth signal R-T unit（3）And/or the 4th Bluetooth signal R-T unit（4）Output
Bluetooth pulse signal.
10. a kind of security system based on MEMS sensor according to claim 6, which is characterized in that the processing
Device selects ARM framework Cortex-M3 core single-chip microcontroller；The first Bluetooth signal R-T unit and/or the second Bluetooth signal are received
Transmitting apparatus, including low-power consumption CC2540 bluetooth single crystalline chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810383190.8A CN108876978A (en) | 2018-04-26 | 2018-04-26 | A kind of security system based on MEMS sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810383190.8A CN108876978A (en) | 2018-04-26 | 2018-04-26 | A kind of security system based on MEMS sensor |
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| CN201810383190.8A Pending CN108876978A (en) | 2018-04-26 | 2018-04-26 | A kind of security system based on MEMS sensor |
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