CN106646556A - Navigation system and navigation method based on doorplate - Google Patents
Navigation system and navigation method based on doorplate Download PDFInfo
- Publication number
- CN106646556A CN106646556A CN201611205651.XA CN201611205651A CN106646556A CN 106646556 A CN106646556 A CN 106646556A CN 201611205651 A CN201611205651 A CN 201611205651A CN 106646556 A CN106646556 A CN 106646556A
- Authority
- CN
- China
- Prior art keywords
- doorplate
- navigation
- positioning
- navigation terminal
- terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Navigation (AREA)
- Traffic Control Systems (AREA)
Abstract
The invention discloses a navigation system and navigation method based on a doorplate. The system comprises a navigation terminal, a management terminal, and a positioning doorplate disposed on a building. The navigation terminal comprises a controller, a GPS module, a touch screen, and a first wireless communication module. The positioning doorplate comprises a doorplate body, and the doorplate body is provided with a microprocessor, a power module, and a second wireless communication module. The controller is electrically connected with the GPS module, the touch screen, and the first wireless communication module. The microprocessor is electrically connected with the power module and the second wireless communication module, and the second wireless communication module is in wireless connection with a management terminal through a wireless network. The system can carry out the precise navigation of the address of a target doorplate.
Description
Technical field
The present invention relates to field of navigation technology, more particularly to a kind of navigation system and air navigation aid based on doorplate.
Background technology
Current navigation mode, when going to the strange doorplate address of unfamiliar city, typically passes through GPS navigation device
(smart mobile phone or special navigator) sets destination doorplate address, then according to the prompting of omniselector, finds destination.Connecing
During nearly destination doorplate address, due to due to the intrinsic position errors of GPS are larger, it is impossible to be accurately positioned omniselector and destination
Position relationship between doorplate, user generally requires to be found near the doorplate of destination and for a long time just can find destination doorplate, and
Some doorplates are made in itself less, and installation site may be also more hidden, and user finds needs and takes more time.Particularly
Stand in great numbers in high building, building close quarters, GPS blocked by building, and positioning precision is reduced, and navigation error is bigger, and user finds
Destination doorplate needs to take more time.
The content of the invention
When the purpose of the present invention is to overcome existing navigation system navigation specific destination doorplate address, navigation accuracy is relatively low
A kind of technical problem, there is provided navigation system and air navigation aid based on doorplate, it can be carried out for destination doorplate address
Accurate navigation, reduces user and finds the time that doorplate spends.
In order to solve the above problems, the present invention is employed the following technical solutions and is achieved：
A kind of navigation system based on doorplate of the present invention, including navigation terminal, management terminal and be arranged on building
Positioning doorplate, the navigation terminal include controller, GPS module, touch-screen and the first wireless communication module, the controller
Electrically connect with GPS module, touch-screen and the first wireless communication module respectively；The positioning doorplate includes doorplate body, the door
Board body is provided with microprocessor, power module and the second wireless communication module, the microprocessor respectively with power module and
Second wireless communication module is electrically connected, and second wireless communication module is wirelessly connected by wireless network with management terminal.
In the technical program, with doorplate address on doorplate body.User is input into mesh on the touch-screen of navigation terminal
Ground doorplate address, the self geographical position that navigation terminal is first obtained according to GPS module navigated.
The distance between geographical position of doorplate address when geographical position and the destination of navigation terminal is less than setting value K
When, navigation terminal outwards periodically sends out Location Request, and Location Request includes the identity of itself, and positioning doorplate is received
Location Request and its signal strength values are sent to into management terminal after the Location Request that navigation terminal sends.When management terminal is received
During the Location Request that the same navigation terminal same time sent at least three positioning doorplates not on the same line sends,
Management terminal selects three most strong positioning doorplates not on the same line of the positioning request signal intensity level for sending, according to this
The signal strength values of the Location Request that the geographical position of three positioning doorplates and these three positioning doorplates are received calculate navigation eventually
The geographical position at end, and the navigation terminal geographical position for calculating is sent to into navigation terminal by positioning doorplate.Navigation terminal
Send every time after Location Request, if receiving the navigation terminal geographical position that positioning doorplate sends within the time of setting,
Navigation terminal geographical position according to receiving is navigated, if being not received by positioning doorplate transmission within the time of setting
Navigation terminal geographical position then according to GPS module obtain self geographical position navigated.
At close destination doorplate address, navigation terminal is positioned by positioning doorplate, positioning precision is higher, receives
Building interference is less, improves navigation accuracy.
Preferably, the navigation terminal also includes voice output module, the voice output module is electrically connected with controller
Connect.When navigation terminal is close apart from the doorplate address of destination, voice output module output voice reminder reminds user to reach
The doorplate address of destination.
Preferably, the navigation terminal also includes power button, the power button is electrically connected with the controller.
Preferably, being additionally provided with several LED lights, the LED light and microprocessor on the doorplate body
Electrical connection.Several LED lights surround annular, when navigation terminal is close apart from the doorplate address of destination, destination
LED light flicker on the corresponding positioning doorplate in doorplate address, attracts the user's attention.
Preferably, being additionally provided with anti-clutter circuit on the doorplate body, the anti-clutter circuit includes inductance L, voltage stabilizing
Diode D2, resistance R2, electric capacity C2 and electric capacity C3, the positive pole of the power module and the negative electrode of Zener diode D2, resistance R2
The electrical connection of one end, electric capacity C2 one end and inductance L one end, the anode of Zener diode D2, the resistance R2 other ends and electric capacity C2 are another
End ground connection, the inductance L other ends are electrically connected with the power end of electric capacity C3 one end and microprocessor, electric capacity C3 other ends ground connection.Quite
The high energy noise of a part is entered from power supply, the voltage of interference is clamped down on using powerful Zener diode D2, together
When the interference of input is consumed by resistance R2, further suppressed by inductance L it is prominent come strong jamming enter back-end system, have
Effect prevents electrostatic interference and electromagnetic interference.
The air navigation aid of a kind of navigation system based on doorplate of the present invention, for a kind of above-mentioned navigation based on doorplate
System, comprises the following steps：
Navigation terminal reads the doorplate address of the destination of user input, and by GPS module the geographical position of itself is obtained,
Navigated according to the self geographical position that GPS module is obtained；
The distance between geographical position of doorplate address when geographical position and the destination of navigation terminal is less than setting value K
When, navigation terminal outwards periodically sends out Location Request by the first wireless communication module, and Location Request includes the body of itself
Part mark, positioning doorplate receives and Location Request and its signal strength values are sent to into pipe after the Location Request that navigation terminal sends
Reason terminal, when management terminal receive at least three not on the same line positioning doorplates send same navigation terminals it is same
During the Location Request that the time sends, management terminal selects the positioning request signal intensity level most strong three for sending not with always
Positioning doorplate on line, according to these three positioning doorplates send positioning request signal intensity levels calculate navigation terminal with this three
The distance value of individual positioning doorplate, further according to the geographical position of three positioning doorplates the geographical position of navigation terminal is calculated, and will
The navigation terminal geographical position for calculating is sent to navigation terminal by positioning doorplate；
Navigation terminal is sent every time after Location Request, if receiving the navigation that positioning doorplate sends within the time of setting
Terminal geographic position, then navigated according to the navigation terminal geographical position that receives, otherwise obtained according to GPS module itself
Navigated in geographical position.
Preferably, the Location Request also including destination doorplate address, when the doorplate address of destination it is corresponding
When positioning doorplate receives the Location Request of navigation terminal transmission, the positioning doorplate judges whether positioning request signal intensity level is big
In setting value, if greater than setting value, then positioning doorplate transmission feeds back signal to navigation terminal, and navigation terminal receives feedback
Voice reminder is sent after signal.
Preferably, the Location Request also including destination doorplate address, when the doorplate address of destination it is corresponding
When positioning doorplate receives the Location Request of navigation terminal transmission, the positioning doorplate judges whether positioning request signal intensity level is big
In setting value, if greater than setting value, then the indicator lamp flicker on the positioning doorplate, while the positioning doorplate sends feedback signal
To navigation terminal, navigation terminal is received and send after feedback signal voice reminder.
The doorplate address and its geographical position of positioning doorplate preferably, navigation terminal is stored with.
Preferably, the identity of navigation terminal is unique No. ID.
The invention has the beneficial effects as follows：For destination doorplate address can accurately be navigated, reduce user and seek
The time for looking for doorplate to spend.
Description of the drawings
Fig. 1 is a kind of structural representation of the present invention；
Fig. 2 is the structural representation of navigation terminal；
Fig. 3 is the circuit theory connection block diagram of navigation terminal；
Fig. 4 is the structural representation for positioning doorplate；
Fig. 5 is the circuit theory connection block diagram for positioning doorplate；
Fig. 6 is the circuit theory diagrams of anti-clutter circuit.
In figure：1st, navigation terminal, 2, management terminal, 3, positioning doorplate, 4, controller, 5, GPS module, 6, touch-screen, 7,
First wireless communication module, 8, microprocessor, 9, power module, the 10, second wireless communication module, 11, voice output module,
12nd, LED light, 13, power button.
Specific embodiment
Below by embodiment, and accompanying drawing is combined, technical scheme is described in further detail.
Embodiment：A kind of navigation system based on doorplate of the present embodiment, as shown in figure 1, including navigation terminal 1, management
Terminal 2 and the positioning doorplate 3 being arranged on building, as shown in Figure 2 and Figure 3, navigation terminal 1 include controller 4, GPS module 5,
Touch-screen 6, the first wireless communication module 7, voice output module 11 and power button 13, as shown in Figure 4, Figure 5, position doorplate 3
Including doorplate body, doorplate body be provided with microprocessor 8, power module 9, the second wireless communication module 10 and several enclose
The LED light 12 for circularizing, controller 4 respectively with GPS module 5, touch-screen 6, the first wireless communication module 7, voice output
Module 11 and power button 13 are electrically connected, and microprocessor 8 is indicated respectively with power module 9, the second wireless communication module 10 and LED
Lamp 12 is electrically connected, and the second wireless communication module 10 is wirelessly connected by wireless network with management terminal 2.
With doorplate address on doorplate body.User is input into the doorplate address of destination on the touch-screen of navigation terminal,
The self geographical position that navigation terminal is first obtained according to GPS module is navigated.
The distance between geographical position of doorplate address when geographical position and the destination of navigation terminal is less than setting value K
When, navigation terminal outwards periodically sends out Location Request, and Location Request includes the identity of itself, and positioning doorplate is received
Location Request and its signal strength values are sent to into management terminal after the Location Request that navigation terminal sends.When management terminal is received
During the Location Request that the same navigation terminal same time sent at least three positioning doorplates not on the same line sends,
Management terminal selects three most strong positioning doorplates not on the same line of the positioning request signal intensity level for sending, according to this
The signal strength values of the Location Request that the geographical position of three positioning doorplates and these three positioning doorplates are received calculate navigation eventually
The geographical position at end, and the navigation terminal geographical position for calculating is sent to into navigation terminal by positioning doorplate.Navigation terminal
Send every time after Location Request, if receiving the navigation terminal geographical position that positioning doorplate sends within the time of setting,
Navigation terminal geographical position according to receiving is navigated, if being not received by positioning doorplate transmission within the time of setting
Navigation terminal geographical position then according to GPS module obtain self geographical position navigated.
When navigation terminal is close apart from the doorplate address of destination, voice output module output voice reminder is reminded and used
The doorplate address that family arrives at, the LED light flicker on the corresponding positioning doorplate in doorplate address of destination, attracts to use
Family notes.At close destination doorplate address, navigation terminal is positioned by positioning doorplate, positioning precision is higher, receives
Building interference is less, improves navigation accuracy.
As shown in fig. 6, being additionally provided with anti-clutter circuit on doorplate body, anti-clutter circuit includes inductance L, Zener diode
D2, resistance R2, electric capacity C2 and electric capacity C3, the positive pole of power module 9 and the negative electrode of Zener diode D2, resistance R2 one end, electric capacity
C2 one end and inductance L one end electrically connect, the anode of Zener diode D2, the resistance R2 other ends and electric capacity C2 other ends ground connection, electricity
The sense L other ends are electrically connected with the power end of electric capacity C3 one end and microprocessor 8, electric capacity C3 other ends ground connection.It is significant component of
High energy noise is entered from power supply, and the voltage of interference is clamped down on using powerful Zener diode D2, while by electricity
Resistance R2 consuming the interference of input, further suppressed by inductance L it is prominent come strong jamming enter back-end system, effectively prevent quiet
Electrical interference and electromagnetic interference.
The air navigation aid of a kind of navigation system based on doorplate of the present embodiment, for a kind of above-mentioned leading based on doorplate
Boat system, comprises the following steps：
Navigation terminal reads the doorplate address of the destination of user input, and by GPS module the geographical position of itself is obtained,
Navigated according to the self geographical position that GPS module is obtained；
The distance between geographical position of doorplate address when geographical position and the destination of navigation terminal is less than setting value K
When, navigation terminal outwards periodically sends out Location Request by the first wireless communication module, and Location Request includes the transmission time
Mark, the identity of itself, the doorplate address of destination, positioning doorplate is received will after the Location Request that navigation terminal sends
Location Request and its signal strength values are sent to management terminal, when management terminal receives at least three not on the same line
During the Location Request that the same navigation terminal same time that positioning doorplate sends sends, management terminal selects the Location Request for sending
Three most strong positioning doorplates not on the same line of signal strength values, according to the Location Request that these three positioning doorplates send
Signal strength values calculate the distance value of navigation terminal and these three positioning doorplates, further according to the geographical position of three positioning doorplates
Calculate the geographical position of navigation terminal, and by the navigation terminal geographical position for calculating by can be with navigation terminal radio communication
Positioning doorplate be sent to navigation terminal；
Navigation terminal is sent every time after Location Request, if receiving the navigation that positioning doorplate sends within the time of setting
Terminal geographic position, then navigated according to the navigation terminal geographical position that receives, otherwise obtained according to GPS module itself
Navigated in geographical position.
Navigation terminal is stored with and positions the doorplate address and its geographical position of doorplate.The identity of navigation terminal is unique
No. ID.
When the corresponding positioning doorplate in the doorplate address of destination receives the Location Request of navigation terminal transmission, the positioning
Whether doorplate judges positioning request signal intensity level more than setting value, if greater than setting value, the then instruction on the positioning doorplate
Lamp flashes, while the positioning doorplate sends feeds back signal to navigation terminal, navigation terminal is received and send after feedback signal voice
Remind, be easy to user to be quickly found out target doorplate.
Claims (8)
1. a kind of navigation system based on doorplate, it is characterised in that：Build including navigation terminal (1), management terminal (2) and being arranged on
The positioning doorplate (3) on thing is built, the navigation terminal (1) includes controller (4), GPS module (5), touch-screen (6) and the first nothing
Line communication module (7), including doorplate body, the doorplate body is provided with microprocessor (8), power supply to positioning doorplate (3)
Module (9) and the second wireless communication module (10), the controller (4) respectively with GPS module (5), touch-screen (6) and the first nothing
Line communication module (7) is electrically connected, and the microprocessor (8) is electric with power module (9) and the second wireless communication module (10) respectively
Connection, second wireless communication module (10) is wirelessly connected by wireless network with management terminal (2).
2. a kind of navigation system based on doorplate according to claim 1, it is characterised in that：The navigation terminal (1) is also
Including voice output module (11), the voice output module (11) electrically connects with controller (4).
3. a kind of navigation system based on doorplate according to claim 1, it is characterised in that：The navigation terminal (1) is also
Including power button (13), the power button (13) electrically connects with controller (4).
4. a kind of navigation system based on doorplate according to claim 1 or 2 or 3, it is characterised in that：The doorplate body
On be additionally provided with anti-clutter circuit, the anti-clutter circuit includes inductance L, Zener diode D2, resistance R2, electric capacity C2 and electric capacity
C3, the positive pole of the power module (9) and the negative electrode of Zener diode D2, resistance R2 one end, electric capacity C2 one end and inductance L one end
Electrical connection, the anode of Zener diode D2, the resistance R2 other ends and electric capacity C2 other ends ground connection, the inductance L other ends and electric capacity C3
The power end electrical connection of one end and microprocessor (8), electric capacity C3 other ends ground connection.
5. a kind of air navigation aid of the navigation system based on doorplate, for a kind of the leading based on doorplate described in claim 1-4
Boat system, it is characterised in that comprise the following steps：
Navigation terminal reads the doorplate address of the destination of user input, and by GPS module the geographical position of itself is obtained, according to
The self geographical position that GPS module is obtained is navigated；
When the distance between geographical position of doorplate address when geographical position and the destination of navigation terminal is less than setting value K,
Navigation terminal outwards periodically sends out Location Request by the first wireless communication module, and Location Request includes the identity mark of itself
Know, positioning doorplate receives and Location Request and its signal strength values are sent to into management eventually after the Location Request that navigation terminal sends
End, when management terminal receives the same navigation terminal same time that at least three positioning doorplates not on the same line send
During the Location Request for sending, management terminal selects the positioning request signal intensity level most strong three for sending not on the same line
Positioning doorplate, according to these three positioning doorplates send positioning request signal intensity levels calculate navigation terminal with these three determine
The distance value of position doorplate, further according to the geographical position of three positioning doorplates the geographical position of navigation terminal is calculated, and will be calculated
The navigation terminal geographical position for going out is sent to navigation terminal by positioning doorplate；
Navigation terminal is sent every time after Location Request, if receiving the navigation terminal that positioning doorplate sends within the time of setting
Geographical position, then navigated according to the navigation terminal geographical position for receiving, the own geographical for otherwise being obtained according to GPS module
Navigated position.
6. the air navigation aid of a kind of navigation system based on doorplate according to claim 5, it is characterised in that：The positioning
Request also including the doorplate address of destination, sends when the corresponding positioning doorplate in the doorplate address of destination receives navigation terminal
Location Request when, the positioning doorplate judges positioning request signal intensity level whether more than setting value, if greater than setting value, then
The positioning doorplate sends and feeds back signal to navigation terminal, and navigation terminal is received and send after feedback signal voice reminder.
7. the air navigation aid of a kind of navigation system based on doorplate according to claim 5 or 6, it is characterised in that：Navigation
Terminal storage has the doorplate address and its geographical position of positioning doorplate.
8. the air navigation aid of a kind of navigation system based on doorplate according to claim 5 or 6, it is characterised in that：Navigation
The identity of terminal is unique No. ID.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611205651.XA CN106646556A (en) | 2016-12-23 | 2016-12-23 | Navigation system and navigation method based on doorplate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611205651.XA CN106646556A (en) | 2016-12-23 | 2016-12-23 | Navigation system and navigation method based on doorplate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106646556A true CN106646556A (en) | 2017-05-10 |
Family
ID=58827005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611205651.XA Pending CN106646556A (en) | 2016-12-23 | 2016-12-23 | Navigation system and navigation method based on doorplate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106646556A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101179589A (en) * | 2007-12-07 | 2008-05-14 | 中国移动通信集团广东有限公司 | Wireless electronic doorplate, wireless electronic doorplate system and method |
| CN101520969A (en) * | 2008-12-23 | 2009-09-02 | 陈俊林 | Positioning navigation doorplate |
| CN103471604A (en) * | 2012-06-08 | 2013-12-25 | 昆达电脑科技(昆山)有限公司 | Method and navigation apparatus for backwards counting doorplate number by voice |
| CN104252779A (en) * | 2014-09-19 | 2014-12-31 | 连宁 | Riding guiding system and method based on Bluetooth communications |
| US20150138014A1 (en) * | 2013-04-01 | 2015-05-21 | Fitbit, Inc. | Portable biometric monitoring devices having location sensors |
| CN105389533A (en) * | 2015-10-16 | 2016-03-09 | 贵州中科汉天下科技有限公司 | Method and system for searching and positioning object |
| CN105551207A (en) * | 2015-12-25 | 2016-05-04 | 北京奇虎科技有限公司 | Object searching and processing method and apparatus thereof |
| CN205720641U (en) * | 2016-06-15 | 2016-11-23 | 浙江利尔达物联网技术有限公司 | A kind of article and personnel location system |
-
2016
- 2016-12-23 CN CN201611205651.XA patent/CN106646556A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101179589A (en) * | 2007-12-07 | 2008-05-14 | 中国移动通信集团广东有限公司 | Wireless electronic doorplate, wireless electronic doorplate system and method |
| CN101520969A (en) * | 2008-12-23 | 2009-09-02 | 陈俊林 | Positioning navigation doorplate |
| CN103471604A (en) * | 2012-06-08 | 2013-12-25 | 昆达电脑科技(昆山)有限公司 | Method and navigation apparatus for backwards counting doorplate number by voice |
| US20150138014A1 (en) * | 2013-04-01 | 2015-05-21 | Fitbit, Inc. | Portable biometric monitoring devices having location sensors |
| CN104252779A (en) * | 2014-09-19 | 2014-12-31 | 连宁 | Riding guiding system and method based on Bluetooth communications |
| CN105389533A (en) * | 2015-10-16 | 2016-03-09 | 贵州中科汉天下科技有限公司 | Method and system for searching and positioning object |
| CN105551207A (en) * | 2015-12-25 | 2016-05-04 | 北京奇虎科技有限公司 | Object searching and processing method and apparatus thereof |
| CN205720641U (en) * | 2016-06-15 | 2016-11-23 | 浙江利尔达物联网技术有限公司 | A kind of article and personnel location system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9537385B2 (en) | Induction current sampling device and method for bridgeless PFC circuit | |
| CN207585684U (en) | A kind of NB-IOT wireless intelligent water meters | |
| CN104062507B (en) | A kind of accumulator internal resistance measuring instrument | |
| CN106646357A (en) | Positioning navigation system and navigation method based on electronic doorplate | |
| CN109413532B (en) | Bluetooth headset charging circuit and Bluetooth headset | |
| CN102519453A (en) | Scenic spot navigation positioning device on bicycle | |
| CN208059939U (en) | Environmental monitoring system based on Internet of Things | |
| CN106646556A (en) | Navigation system and navigation method based on doorplate | |
| CN102592403A (en) | Microcomputer eyesight protecting voice prompter | |
| CN202093507U (en) | Slave M-Bus interface circuit of a meter reading system | |
| CN101937016A (en) | Low voltage promoting device | |
| EP2448342A1 (en) | Method and apparatus for realizing summer time in cdma system | |
| CN211151568U (en) | Battery management system slowly charges CP signal awakening circuit | |
| CN107218571A (en) | A kind of solar street light and shared battery system | |
| CN105539191A (en) | Photovoltaic charging pile for electric automobile | |
| CN206948692U (en) | A kind of street lamp fault monitoring device | |
| CN209215474U (en) | A kind of under-voltage warning circuit with hysteresis | |
| CN104617648B (en) | A kind of charging control circuit and charging device | |
| CN112423223A (en) | Indoor positioning system and positioning method using Bluetooth signals | |
| JP2003098199A (en) | Current monitor | |
| CN104202890A (en) | Standby circuit for lighting device, and working circuit for lighting device | |
| CN201788272U (en) | Fire emergency illuminating lamp detection device | |
| CN213659199U (en) | Lighting lamp Internet of things control system topology framework and control equipment | |
| CN207819541U (en) | It is a kind of using solar powered stadia surveying circuit and to apply its rangefinder | |
| CN212111644U (en) | Multi-parameter detection sensor for power transmission line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170510 |
|
| RJ01 | Rejection of invention patent application after publication |