CN105894730A - Research and design of portable GSM&GPS fall detector - Google Patents
Research and design of portable GSM&GPS fall detector Download PDFInfo
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- CN105894730A CN105894730A CN201410841648.1A CN201410841648A CN105894730A CN 105894730 A CN105894730 A CN 105894730A CN 201410841648 A CN201410841648 A CN 201410841648A CN 105894730 A CN105894730 A CN 105894730A
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Abstract
The invention relates to research and design of a portable GSM&GPS fall detector. According to the invention, modules such as an ADXL345 three-axis acceleration sensor, a single-chip microcomputer and a GPS&GSM are combined together to realize detection of accidental fall and transmission of position information after the fall; and a complete fall detection algorithm is designed. The algorithm is executed according to four states in a fall accident, namely, a weightless state, collision with the ground, comparison of the state of the body of a user after collision with the state of the body before collision, and a motionless state.
Description
Technical field
The present invention combines position after ADXL345, single-chip microcomputer and GPS&GSM module realize the detection of accidentally tumble and fall
The transmission of information.The present invention has two major function: GSM (global system for mobile communications) and GPS (global positioning system).
The invention belongs to detect control and the communications field, there is low cost, low-power consumption and portable feature.It may apply to electronics
Engineering and survey field.
Background technology
Nowadays the life-span of the mankind is just becoming the longest, and along with growth in the living standard and development, the problem of aging also becomes more
Come the most obvious.For old people, due to the degeneration of physical function, a lot of contingencies are difficult to avoid, such as accidentally tumble.
A lot of old men lose consciousness after falling thus delay the opportunity of first aid.After the generation of these tragedies is because Falls Among Old People mostly
Relatives cannot be notified, even if old man keeps clear-headed, it is also difficult to talk clearly the particular location fallen, to such an extent as to delay first aid.So
The detection of accidentally tumble and the transmission of positional information are most important for relief accidentally tumble.
Detection and the alarm fallen are extremely important for first aid.Along with 3-axis acceleration sensor and the development of GPS module, they
Volume become to be easy to carry, we by these block combiner with realize required for function.The present invention is by algorithm for design
The output of reason 3-axis acceleration sensor, and with single-chip computer AT89C52 control GSM&GPS module realize falling warning and
Positional information sends, and it can effectively reduce the unexpected loss brought.
Communication technology:
When falling, it is possible to the information that sends timely is very important.So output device can not be by time or space
Limit.FOR ALL WE KNOW, electromagnetic wave signal can be at free space transmission.Radio communication has and does not uses wire transmission to hand over
The advantage changing information.In recent years, in the communications field, radio communication have become as development the most rapidly with communicating of being most widely used
Technology.This technology has been deep into our daily life and the various aspects of work, and including mobile phone, (honeycomb moves logical
Letter).
Global Systems for Mobile communications (GSM) are the most important digital mobile broadcast standards that the current public uses.GSM is by Europe
Telecommunication standard association (ETSI) standardization.GSM covers major function and necessary data transfer entity, such as protocol entity tying
Structure and rate adaptation.GSM is a successful model, and numerous signs show, user wishes that data can service in a short time and moving
Dynamic network-side.For GSM carrier, circuit switched data transmission is utilized to define the large-scale fine of RRM.Manage
Person must use the wave point of packet switch.Packet switch allows to use data channel in wave point optimization.And with body
Long-pending charging rather than persistent period.GSM/GPRS and following UMTS operator need to be deployed in the industry can most advanced and
The framework of IP service flexibly, in order to have enough ammunitions to make a call to a hot battle, Win Clients group, keep low-bleed to lead to
Cross the access predictability that high-caliber CSAT and service are provided, and maintain higher profit margin.
The structure of network is divided into multiple discontinuous part, and the structure of a GSM network includes:
1. base station sub-system-base station and the explanation of controller.
2. a part of network of network and switching subsystem-most like with fixing network, simply sometimes referred to as " core network ".
3.GPRS core net-allow packet-based network to connect optional part.
4. OSS (OSS)-network operation.
Location technology:
GPS (GPS) revolutionizes navigation and location.For most of naval vessels and aircraft, this is navigation
Main Means.It is also extensively used for measuring and many other fields simultaneously.GPS system, is initially referred to as NAVSTAR, is one
Individual guiding guided missile, warship and the aircraft target military navigation system to them.
At present, global positioning system comes into operation the most comprehensively, and meets the best located system that is found in the sixties in 20th century
Standard.This system provides accurate, continuous print, worldwide, three-dimensional position and velocity information, provide the user conjunction
Suitable reception equipment.GPS also propagates with the form of Coordinated Universal Time(UTC) (UTC).Nominally this satellite constellation is pacified by 24 satellites
Come 6 orbit planes, 4 satellites of each plane.GPS can be that any number of user provides service because user receives
Device is passive.
Global positioning system is by three parts.Space segment has 28 satellites at present, and each is all being positioned at the earth 11000 nautical miles
In above track.User segment includes receptor, and you with in hand held, or can be arranged on your car.Control part is by being distributed in
All over the world to guarantee earth station's composition that satellite normally works.
Summary of the invention
The key point of the present invention is to set up the communication between ADXL345 and AT89C52 and the realization of fall detection algorithm,
1. communication protocol
ADXL345 is the 3-axis acceleration sensor of a highly sensitive wide range.We will add with three axles of ADXL345
Speed output detects falls.
We can set up the communication between ADXL345 and AT89C52 by SPI communication agreement, but, SPI communication agreement
At main frame with all lack flow control and response from machine.Main frame is not known from machine the most busy so needing complicated software programming to come in fact
Existing main frame and the response between machine.12Although C communication protocol transfer rate does not has SPI fast, but there is perfect acknowledgement mechanism,
It can meet our design and require so have selected 12C communication protocol.
12C only has two bus lines, and one is serial data line (SDA), and one is serial time clock line (SCL).SDA bears
Duty data transmission, SCL is responsible for the clock of data transmission and synchronizes.12C has 7 or 10 bit address space.Common I2C bus
Speed be mode standard 100kbit/s and low-speed mode 10kbit/s, but arbitrarily low clock frequency also be allow.Bit rate
It is cited and processes main frame and there is no clock line stretching or other hardware spendings from machine.Protocol overhead includes slave addresses, the most also
There is the answer signal of each in the register address from equipment.
2. rudimentary algorithm thinking
The first step of one fall detection product of design is exactly to analyze each state during falling.In general, when outside people's will
When falling, altogether 4 steps of experience, as follows: weightlessness, and the shock on ground, the condition after shock and before
Epidemic situation comparison is static.The acceleration condition of a lot of motions and a great difference of having fallen.
But, in usual motor process, have many similar conditions identical with kinestate above.Such as jump,
They can produce weightless equally and clash into.But after a jump, human body is restored to the condition before jumping, and can distinguish
This type games.So the 3-axis acceleration kinestate that we can compare before and after shock can recover original kinestate to distinguish those
Activity and accidentally tumble, such as jump, running etc..
Be most difficult to judgement is to sit down to keep static afterwards.We can be from weightless time and 3-axis acceleration with distinguish it and meaning
Fall outward.Fall clash into 3-axis acceleration and be far longer than when sitting down produce 3-axis acceleration and.We can set up weightlessness
Threshold values is distinguished and is fallen and may produce static activity after other motions.Our algorithm is namely based on above to body movement
Analysis set up.
Detailed description of the invention
Realize the algorithm of fall detection, it is necessary first to set up 3-axis acceleration sensor ADXL345 and single-chip microcomputer STC89C52
Between communication.Use I2C communication protocol from ADXL345 to bus transfer data.The collection of it and data and transmit relevant.
1.ADXL345 and the data transmission between STC89c52
In our invention, our only one of which main frame STC89C52 and one are from machine ADXL345.Commencing signal (S): when
When SCL is high level, SDA is by high level to low transition, and expression will start to transmit data；End signal (P): work as SCL
During for high level, SDA to high level saltus step by low level, is represented and terminates transmission data；
Response signal (ACK): after machine receives 8 bit data, the 9th cycle, drags down SDA level, represents and has received
Data.This ack signal is referred to as answer signal.
Main frame STC89C52 to transmit data to from machine ADXL345 with data wire SDA, uses clock line traffic control.Detailed process
As follows:
1., when STC89C52 detects ADXL345 free time, main frame sends commencing signal；
2. main frame STC89C52 sends 8 bit data to from machine ADXL345.Front 7 expression slave addresses of this 8 bit data, the 8th
Position represents the transmission direction of data.At this moment, the 8th is 0, and expression is that main frame sends data to from machine；
3. send response signal ACK from machine ADXL345；
4. transmit a series of byte and response bit from machine ADXL345；
5. main frame STC89C52 accepts these data, and sends end signal P, completes this data transfer.
When ADXL345 sends a byte to bus, it must start single byte to bus transfer data from highest byte.
The binary data that ADXL345 exports is moved to left by we with dat ＜ ＜=1, highest order is moved in PSD register CY position
Then CY is assigned to SDA, and then sends under the control of SCL.Data are sent with FOR statement loop.Often pass
A defeated byte data receives a response ACK from ADXL345.
It is similar to, when STC89C52 reads data from bus, and we carry out left shift date with dat ＜ ＜=1 and be stored in equally
In the depositor of STC89C52.
2. mastery routine
Control algolithm
According to the process fallen, main variable is 3-axis acceleration vector.
When people walks or keeps static, 3-axis acceleration vector is generally kept in an about g.But, when people fall
And during colliding surface, 3-axis acceleration vector can reach a peak value, more than a g.So we set up threshold values to sentence
Break and whether clashed into ground.But the most violent motion for example, jump after land also will be 3-axis acceleration vector be more than one
Individual g.After people fall, the state of general 3-axis acceleration be different from before walk or static when people jump after, meeting
It is returned to original kinestate.So, the 3-axis acceleration state before colliding surface and after colliding surface can be distinguished by we
Both of these case.
After people fall, if it is possible to oneself gets up, the alarm of fall detection should be released from.If do not moved for a long time
Moving or motion, this just illustrates that this people can not oneself save oneself, and now this instrument just should notify relatives, and warning may have occurred
The situation fallen.So we set up regular hour threshold values to detect whether he keeps static, if keeping static, perhaps he
Faint after falling down, it is necessary to send alarm.
Initial idea is such.Three weeks acceleration informations of x, y, z are stored in single-chip microcomputer STC89C52, to data
After format analysis processing is complete, the accekeration of three axles that we are permissible, every 1000 represent 1 g.Threshold values is established as 1200 by us
Be exactly 1.2 g, thus can distinguish accidentally tumble and walk, static or wave generation 3-axis acceleration vector thus
Distinguish these motions.
If the vector of 3-axis acceleration is less than threshold values 1.2g, this equipment will not send warning certainly.It can detect after 200
Millisecond, still in state I.If the vector of 3 axle accelerations is more than 1.2g, it can enter into next detecting step II.
After 3.5 seconds of shock being detected, the data of the 3 axle acceleration vector data preserved 3.5 seconds before compare[10].If
Data are the same, and it illustrates that perhaps this people simply jumps but returns to ordinary movement, and alarm condition will be eliminated.As
Really data are front from 3.5 seconds different, it illustrate people also do not return to motion before state, perhaps he be fall down after dizzy
Fall.In the latter case, state I II will be entered.In this state, the state of fall detection and health with 3.5 seconds with
Unlike before, state I II will go into state I V, if people can stand up and move, warning should be released from, if he
Immovable, and continue for long time, perhaps he may fall and cannot others' help side of self-service needs in this explanation
Help.This equipment should send alert message, and send positional information and be supplied to kith and kin.I arranges the static time threshold values of holding is 10
Second.
But, there is under certain situation the judgement still resulting in mistake.As acutely sat down and keeping static afterwards.So we add
Add a weightless judgement.Sit down and one section of weightlessness of accidentally tumble, but the weightlessness sat down is much smaller than accidentally tumble, because sitting down
It is by muscle control, does not results in big weightlessness.Threshold value 0.7g that we set is distinguished and is seated and falls down.
Additionally also has a problem.The time threshold values detection keeping static is 10 seconds.The most unconscious motion can be at static shape
Releasing under state is reported to the police.Actually the people of accidentally tumble is still in stupor.It would therefore be desirable to increase serious forgiveness.Solution
Be take 10 seconds before and three weeks acceleration after 10 seconds divided by 100, round numbers.This solution can get rid of to fall down after nothing
The interference of psychomotor.
Finally, the general procedure of our algorithm is as follows: after initialization, and equipment starts detection weightlessness, and it is state I.If
The 3-axis acceleration of this device is less than 0.7g, then program enters into state I I.If when 200 milliseconds, this equipment Inspection is to hitting
The vector of the 3-axis acceleration hit is more than 1.2G, it means that create collision, then enter state I II.In state I II, if
Compare for state and the state before and after 3.5 seconds before clashing into.If state is different, it can enter into state I V.
In state I V, if health still keep geo-stationary, this equipment is by state V of entrance and sends alarm and the position of accidentally tumble
Put.
3.GPS and gsm module
This module is a finished product module, and function is that this module has a button and sets phone number, if having pressed button
Just can call to specific mobile phone.Having another function of this module, we can transmit the message to it, its meeting
Feed back the position of this module.It complies fully with our requirement.It is transformed by we.We are by single-chip microcomputer optocoupler
Control.If equipment Inspection will be called to falling.If old man can not answer, message just can be sent by relevant relatives
To this module, the positional information that feedback is fallen by module.If old man can answer, oneself relatives' location can be told,
Or tell relatives this be one be wrong report.
Claims (4)
1. the present invention combines the modules such as ADXL345 3-axis acceleration sensor, single-chip microcomputer and GPS&GSM and realizes the detection of accidentally tumble.
2. the information fallen is passed through on the cellphone subscriber that the modules such as GPS&GSM are sent to reserve in time.
3. in this invention, the algorithm of fall detection includes weightlessness, with the shock on ground, the condition after shock and epidemic situation comparison before, four states such as static grade.
4. the information of fall detection passes through I2The mode of C bus transmits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410841648.1A CN105894730A (en) | 2014-12-26 | 2014-12-26 | Research and design of portable GSM&GPS fall detector |
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| CN201410841648.1A CN105894730A (en) | 2014-12-26 | 2014-12-26 | Research and design of portable GSM&GPS fall detector |
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| CN201410841648.1A Pending CN105894730A (en) | 2014-12-26 | 2014-12-26 | Research and design of portable GSM&GPS fall detector |
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Cited By (7)
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| CN106530612A (en) * | 2016-10-10 | 2017-03-22 | 芜湖美的厨卫电器制造有限公司 | Falling detection device and method |
| CN106652347A (en) * | 2017-01-24 | 2017-05-10 | 深圳前海零距物联网科技有限公司 | Smart helmet fall detection method and smart helmet |
| CN106960542A (en) * | 2017-05-21 | 2017-07-18 | 北京工业大学 | A kind of low-power consumption falling detection device based on interruption driving |
| CN107633655A (en) * | 2017-09-26 | 2018-01-26 | 深圳市金立通信设备有限公司 | A kind of fall detection method, terminal and computer-readable recording medium |
| CN108447227A (en) * | 2018-03-07 | 2018-08-24 | 天津大学 | A kind of interior is unexpected to fall intelligent alarm platform and its detection method |
| CN109064710A (en) * | 2018-08-14 | 2018-12-21 | 东南大学 | With the security protection terminal and system for falling down identification function |
| CN112805760A (en) * | 2018-11-15 | 2021-05-14 | 广东高驰运动科技有限公司 | Fall detection method, device, equipment and storage medium |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106530612A (en) * | 2016-10-10 | 2017-03-22 | 芜湖美的厨卫电器制造有限公司 | Falling detection device and method |
| CN106530612B (en) * | 2016-10-10 | 2019-02-01 | 芜湖美的厨卫电器制造有限公司 | Falling detection device and method |
| CN106652347A (en) * | 2017-01-24 | 2017-05-10 | 深圳前海零距物联网科技有限公司 | Smart helmet fall detection method and smart helmet |
| WO2018137375A1 (en) * | 2017-01-24 | 2018-08-02 | 深圳前海零距物联网科技有限公司 | Smart helmet fall detection method and smart helmet |
| US10897947B2 (en) | 2017-01-24 | 2021-01-26 | Shenzhen Qianhai Livall Iot Technology Co., Ltd. | Smart helmet fall detection method and smart helmet |
| CN106960542A (en) * | 2017-05-21 | 2017-07-18 | 北京工业大学 | A kind of low-power consumption falling detection device based on interruption driving |
| CN107633655A (en) * | 2017-09-26 | 2018-01-26 | 深圳市金立通信设备有限公司 | A kind of fall detection method, terminal and computer-readable recording medium |
| CN108447227A (en) * | 2018-03-07 | 2018-08-24 | 天津大学 | A kind of interior is unexpected to fall intelligent alarm platform and its detection method |
| CN109064710A (en) * | 2018-08-14 | 2018-12-21 | 东南大学 | With the security protection terminal and system for falling down identification function |
| CN112805760A (en) * | 2018-11-15 | 2021-05-14 | 广东高驰运动科技有限公司 | Fall detection method, device, equipment and storage medium |
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Application publication date: 20160824 |