CN102427611A - Nursing monitoring system based on wireless sensor network - Google Patents
Nursing monitoring system based on wireless sensor network Download PDFInfo
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- CN102427611A CN102427611A CN2011102491610A CN201110249161A CN102427611A CN 102427611 A CN102427611 A CN 102427611A CN 2011102491610 A CN2011102491610 A CN 2011102491610A CN 201110249161 A CN201110249161 A CN 201110249161A CN 102427611 A CN102427611 A CN 102427611A
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Abstract
The invention relates to a nursing monitoring system based on a wireless sensor network, which comprises a plurality of sensor nodes and a central node, wherein the sensor nodes are arranged at a contact point of a user and are used for collecting physiological parameters of the user, and each sensor node comprises a radio frequency module and an MCU (Microprogrammed Control Unit) power management module; the central node comprises a radio frequency module for receiving the physiological parameters collected by the sensor nodes, and transfers the physiological data to a PC (Personal Computer) terminal or an embedded device terminal through a serial port; and the sensor nodes and the central node are in point-to-point connection to form a start network topology structure. According to the invention, the start network topology structure is adopted, resources are concentrated, the network is easy to manage, the coverage area is concentrated, and the stability is strong; low energy consumption is realized between the sensor nodes and the central node through a CSMA /CA (Carrier Sense Multiple Access with Collision Avoidance) control protocol; and nursing personnel can conveniently know physical conditions of a patient in real time, and the aim of real-time monitoring the physical conditions of the patient is effectively achieved.
Description
One, technical field
The present invention relates to monitoring system, particularly a kind of nursing monitoring system that is used to gather human body physiological parameter based on radio sensing network based on radio sensing network.
Two, background technology
The radio sensing network technology is the dual-use strategic high-tech that typically has cross discipline character, and it is widely used in fields such as GF military affairs, national security, environmental science, traffic administration, hazard prediction, health care, manufacturing industry, the development of urban informationization.It is a hot issue of present information science and automatic technology research.And aspect medical treatment and nursing, particularly for the collection aspect of the elderly and patient's health physiological parameter, method commonly used at present is to adopt manpower to measure the method for monitoring, and the time that has so not only spent patient has also increased the burden of nursing.
Three, summary of the invention
The purpose of this invention is to provide a kind of nursing monitoring system based on radio sensing network that is used to gather human body physiological parameter, its network configuration is stable, management and low in energy consumption is concentrated, is easy to coverage.
The present invention solves the technical scheme that the prior art problem is adopted: the nursing monitoring system based on radio sensing network comprises:
A plurality of sensor nodes, the contact point place that places the user is in order to gather user's physiological parameter, and each sensor node includes wireless radio frequency modules and MCU power management module; Said sensor node is configured to timing sampling, sends the pattern of data; Said sensor node is opened wireless radio frequency modules and channel is intercepted when needs send data; If channel is occupied; Continue again to intercept after then keeping out of the way one section random time, occupied if channel does not have, then send data and obtaining closing wireless radio frequency modules after the affirmation; Said MCU power management module gets into sleep pattern, waits for next time and regularly triggering;
Centroid includes wireless radio frequency modules receiving the physiological parameter that said sensor node collects, and through serial ports physiological data is sent to PC end or embedded device end;
Be connected through the point-to-point formula of CSMA/CA control protocol between said sensor node and said Centroid, form the hub-and-spoke network topology structure.
When channel was occupied, definite method of back off time was the random number between producing 1～31 by random function, multiplied each other with a given initial value and got.Said initial value is adjusted according to number of nodes in the network.
The wireless radio frequency modules at said Centroid place is in lasting opening, is used for continuing to receive the wireless signal that is sent by the wireless radio frequency modules of said sensor node.
Said sensor node is the Temperature Humidity Sensor node.
Beneficial effect of the present invention is: the present invention adopts the hub-and-spoke network topology structure; Each sensor node is connected on the Centroid with the mode of point-to-point; Realize that thereby the mass communication of Centroid between branch node can be with in the resource set, network is easy to management, and coverage is concentrated.And wherein certain sensor node Shi Buhui that breaks down has influence on the normal data transfer of other nodes, has reached stable effect; Owing between sensor node and said Centroid,, realized the effect of low energy consumption through the CSMA/CA control protocol.The present invention is through gather human body physiological parameter in real time; And utilize wireless network to be sent to the PC end through Centroid it; Be more convenient for the nursing staff to understand patient's health in real time; Effectively reached the purpose that patient's health status is monitored in real time, effectively utilize the patient day often between in improved the efficient of nursing, reduced the workload of nursing.
Four, description of drawings
Fig. 1 is a schematic network structure of the present invention;
Fig. 2 is the top layer configuration component program code of Temperature Humidity Sensor node of the present invention;
Fig. 3 realizes the defined command code of interface in modular assembly SHT10_M;
Fig. 4 gives top layer configuration file in PC process code through serial ports with data for Centroid of the present invention.
Fig. 5 is the transfer of data flow process figure between wireless sensing equipment and host computer;
Fig. 6 is the flow chart of the receiving course of TEMP data.
Five, embodiment
Below in conjunction with accompanying drawing the present invention is elaborated:
Fig. 1 is a schematic network structure of the present invention.Comprise: a plurality of sensor nodes, the contact point place that places the user is in order to gather user's physiological parameter, and each sensor node includes wireless radio frequency modules and MCU power management module; Centroid includes wireless radio frequency modules receiving the physiological parameter that said sensor node collects, and through serial ports physiological data is sent to PC end or embedded device end and shows and handle; Be connected through the point-to-point formula of CSMA/CA control protocol between said sensor node and said Centroid, form the hub-and-spoke network topology structure.This is because because the human body physiological parameter acquisition range is little, sensor node is concentrated, and does not generally need communication between each node.According to these characteristics, the present invention adopts the hub-and-spoke network topology structure.In the topological structure of star-like networking, each sensor node is connected on the Centroid as the mode of branch node with point-to-point, and when mass communication between Centroid and branch node, it is the most effective adopting the hub-and-spoke network topology structure.Its advantage be can with in the resource set, network is easy to that management, coverage are concentrated, routing algorithm is simple relatively, be easy under the situation that does not influence other joint behaviors, isolated out for problematic node by Centroid.In wireless sensor network; The occupation mode of MAC (Medium Access Control) agreement decision wireless channel; Between sensor node, distribute limited wireless communication resources; Performance of sensor networks is had considerable influence, is one of key network agreement that guarantees wireless sensor network low-power consumption work.In the human body physiological parameter gatherer process; Because sensor node is image data periodically; The small-sized button cell of the normal employing of power supply; And the Centroid abundance of generally supplying power, so adopt CSMA/CA (Carrier Sense Multiple Accesswith Collision Avoidance) control protocol.Because sensor node requires to have the ability that volume is little, low in energy consumption, can carry out data processing and wireless receiving and dispatching, adopts the CC2430EM of TI/Chipcon company here
*Estimate plate as radio receiving transmitting module, promptly wireless radio frequency modules adopts CC2430EM
*Estimate plate, sensor circuit is design voluntarily as required.CC2430
*Estimate P0.1～P0.7, P1.0～P1.7 and the P2.0～P2.2 mouth line of plate, can be connected with sensor circuit and control.Embedded CC2420 RF transceiver of chip CC2430 and 8051MCU power management module; Include the park mode timer of 12bit A/D converter, 4 timers, 32kHz crystal oscillator; Hardware supports CSMA/CA; Supply power voltage 2.0V～3.6V, current drain 0.5 μ A only can pass through external interrupt or real-time clock waking-up under power-down mode.Radio sensing network can be regarded as the computer system of being made up of the limited CPU of a plurality of energy, memory space and disposal ability, and these CPU are separate, again collaborative work.For ease of software development and maintenance, improve software development efficiency, adopt the TinyOS embedded OS, realize that by the nesC language it adopts lightweight threading, the active message communication technology, event-driven mode, modularization programming mode.Use this operating system can improve CPU usage, under the scheduling of TinyOS, all being associated with communication event of tasks can be handled rapidly when incident produces.Disposing and do not having under the situation of other incidents, CPU will get into sleep state.
Centroid adopts the MAX3232 chip, and Centroid is not closed wireless radio frequency modules, continues to receive.Sensor node timing sampling, transmission data are opened wireless radio frequency modules when needs send data, at first channel is intercepted; If channel is occupied, continue again to intercept after then keeping out of the way one section random time, if this moment, channel did not have occupied; Then send data; Close wireless radio frequency modules after obtaining confirming, MCU gets into sleep pattern, waits for next time and regularly triggering.Wherein definite method of back off time is the random number between producing 1～31 by random function, multiplies each other with a given initial value and gets.Said initial value is adjusted according to number of nodes in the network.
The wireless radio frequency modules at said Centroid place is in lasting opening, is used for continuing to receive the wireless signal that is sent by the wireless radio frequency modules of said sensor node.
Said sensor node is the Temperature Humidity Sensor node.
Be example explanation method for designing with the Temperature Humidity Sensor node below, wherein Temperature Humidity Sensor adopts the SHT10 of Switzerland SENSIRION company:
Fig. 2 is the top layer configuration component program code of Temperature Humidity Sensor node, and it mainly utilizes the method for the value of top-level module being paid other modules, finally realizes the link of STH interface.Because all the sensors node all has timing sampling, data processing, by functions such as protocol data transmitting-receiving, wireless radio frequency modules and MCU power managements; So the operation relevant with transducer designed an assembly SHT10_C separately here; In the top layer accessory,, realize each sensor node function through being connected with the dissimilar sensor assembly.Intermediate module SensorNet_C of other function combinations designs that will be irrelevant with sensor operated, relevant with application; Through being connected with CC2430ActiveMessageC, realize MCU power management, CSMA agreement and wireless radio frequency modules control with the accessory McuSleepC of lower floor, CsmaC.Accessory SHT10_C and SensorNet_C only provide the inter-module annexation, and it realizes being accomplished by SHT10_M and SensorNet_M respectively.When call instruction Send.send () sends data, at first clean channel
*Estimate,, then need keep out of the way a period of time if channel is occupied.Random number between back off time produces one 1～31 by random function multiplies each other with a given initial value (being made as 160 μ s, i.e. 10symbols here) and gets.Initial value can be adjusted according to number of nodes in the network, and node initial value at least is little, otherwise then suitably strengthens.In accessory SensorNet_C, use the radio-frequency enabled that provides among the modular assembly CC2430ActiveMessageP through connection fittings CC2430ActiveMessageC.CC2430ActiveMessageP is the top layer assembly in the radio frequency storehouse, and the single-hop communication implementation method is provided.Use the MCU power management function among the modular assembly McuSleepP through connection fittings McuSleepC, realize functions such as MCU sleep, timing and startup, to reduce node power consumption.Need be in the upper component SensorNet_M that uses the McuSleepP assembly realization event McuSleepControl.beforeSleep () and McuSleepControl.after-Wakeup (), with protection with recover the state of sleep front and back.
Fig. 3 realizes the defined command code of interface in modular assembly SHT10_M, Temperature Humidity Sensor SHT10 has the two-wire system serial line interface, and digital signal has been calibrated in output.Here the interface SHT that defines SHT10 is following, need in modular assembly SHT10_M, realize the defined order of interface.
Fig. 4 gives top layer configuration file in PC process code through serial ports with data for Centroid of the present invention.
The sensor node power consumption situation
In the process that human body physiological parameter is gathered, especially in outdoor utility, low-power consumption is extremely important for battery powered sensor node.Adopt the 3.3V DC power supply, 10 Ω resistance of one 1% precision are connected with CC2430EM, calculate the electric current of each time period in the sampling period through the voltage drop at measuring resistance two ends.If sampling period T=10s, the CC2430 radio frequency power output is set to 100%, and table 1 is depicted as the current drain between active stage.
Table 1 sensor node day part current drain calculates
(CC2430 is under the PM2 pattern) current drain under the low-power consumption mode:
0.0005mA×10451.65ms＝5.2258mA·ms
Total current drain in the sampling period T:
472.1mA·ms+5.2258mA·ms)/(3600000ms/h)＝.326×10
-4mAh/10s
Current sinking: 1.326 * 10-4 * 360=0.04774mA per hour
Suppose to use the button cell of 60mAh, then can be service time:
60mAh/0.04774mA＝1256
60mAh/0.04774mA=1256h 52 days this paper of ≈ adopts the nesC language to design Centroid and sensor node program based on TinyOS; Realized using the star-like wireless sensor network of CSMA/CA agreement; And be example with the humiture data acquisition, designed the sensor node that adopts humiture digital sensor SHT10.When the sampling period is 10s, use 60mAh powered battery, the sustainable work of sensor node 52 days.That the design can satisfy is wireless, portable, gather the needs of human body physiological parameter with low power.Use modularization programming language nesC, improved development efficiency, be convenient to expansion.
Fig. 5 is the transfer of data flow process figure between wireless sensing equipment and host computer.Idiographic flow is to ask New-deployed Network after the initialization of wireless sensing device start; Init state is returned in the New-deployed Network failure; Whether New-deployed Network successful back search has the sensing node request to add network, if there is the sensing node request to add, just data transfer request is stored and sent in the address of sensing node; Accepted data successively and passed to host computer after data combination, if do not have the sensing node request to add then do not accept to transmit the request of data
Fig. 6 is the flow chart of TEMP DRP data reception process.Specific as follows: sensor node starts and initialization data; Request adds current network; If not existing, network returns init state; If exist then information is issued coordinator node, coordinator node is collecting temperature data and send subordinate's receiving system on time, then temperature data are sent after transmitting successful request otherwise return coordinator node when sending.
In sum, system of the present invention and implementation method are equally applicable in the collection of other relevant periodicity wireless datas.
Above content is to combine concrete optimal technical scheme to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to protection scope of the present invention.
Claims (4)
1. based on the nursing monitoring system of radio sensing network, it is characterized in that, comprising:
A plurality of sensor nodes, the contact point place that places the user is in order to gather user's physiological parameter, and each sensor node includes wireless radio frequency modules and MCU power management module; Said sensor node is configured to timing sampling, sends the pattern of data; Said sensor node is opened radio-frequency module and channel is intercepted when needs send data; If channel is occupied; Continue again to intercept after then keeping out of the way one section random time, occupied if channel does not have, then send data and obtaining closing wireless radio frequency modules after the affirmation; Said MCU power management module gets into sleep pattern, waits for next time and regularly triggering;
Centroid includes wireless radio frequency modules receiving the physiological parameter that said sensor node collects, and through serial ports physiological data is sent to PC end or embedded device end;
Be connected through the point-to-point formula of CSMA/CA control protocol between said sensor node and said Centroid, form the hub-and-spoke network topology structure.
2. the care monitoring system based on radio sensing network according to claim 1; It is characterized in that; When channel was occupied, definite method of back off time was the random number between producing 1 ~ 31 by random function, multiplied each other with a given initial value and got; Said initial value is adjusted according to number of nodes in the network.
3. the care monitoring system based on radio sensing network according to claim 1; It is characterized in that; The wireless radio frequency modules at said Centroid place is in lasting opening, is used for continuing to receive the wireless signal that is sent by the wireless radio frequency modules of said sensor node.
4. according to claim 1 or 3 described care monitoring systems, it is characterized in that said sensor node is the Temperature Humidity Sensor node based on radio sensing network.
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| CN2011102491610A CN102427611A (en) | 2011-08-26 | 2011-08-26 | Nursing monitoring system based on wireless sensor network |
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| CN2011102491610A CN102427611A (en) | 2011-08-26 | 2011-08-26 | Nursing monitoring system based on wireless sensor network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138791A (en) * | 2013-01-24 | 2013-06-05 | 广州乾华生物科技有限公司 | Method and system for achieving accurate timing by combining relay module and upper computer and relay module |
| CN105957320A (en) * | 2016-05-03 | 2016-09-21 | 成都泰盟软件有限公司 | Wireless connection method for multi-channel bio-signal collector and sensor |
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2011
- 2011-08-26 CN CN2011102491610A patent/CN102427611A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138791A (en) * | 2013-01-24 | 2013-06-05 | 广州乾华生物科技有限公司 | Method and system for achieving accurate timing by combining relay module and upper computer and relay module |
| CN103138791B (en) * | 2013-01-24 | 2015-04-15 | 广州乾华生物科技有限公司 | Method and system for achieving accurate timing by combining relay module and upper computer and relay module |
| CN105957320A (en) * | 2016-05-03 | 2016-09-21 | 成都泰盟软件有限公司 | Wireless connection method for multi-channel bio-signal collector and sensor |
| CN105957320B (en) * | 2016-05-03 | 2019-01-29 | 成都泰盟软件有限公司 | A kind of wireless connection method of multichannel biological signal collecting device and sensor |
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Application publication date: 20120425 |