CN102137476A - Method for realizing low power consumption of portable wireless monitoring terminal - Google Patents

Abstract

A low-power implementation method of a portable wireless monitoring system cleverly uses the reset function of the data acquisition module. The central processor sends a reset command according to the monitoring results and transmits it to the acquisition module through a wireless connection, and then appropriately converts the periodic sampling signal of the data acquisition module. Changes at reset, driving a resettable timer control circuit. This command reset method can realize the synchronization of the state transition (the transition between the working state and the dormant state) at the two ends of the wireless connection, or the prevention of the state transition by properly cooperating with the calculation and processing of the central processing unit. In addition, the central processor can also change the working intensity of the wireless monitoring terminal by sending commands. Under the premise of not affecting the effectiveness of monitoring, the inventive solution intelligently realizes the reduction of power consumption of the system, especially the portable wireless monitoring terminal, prolongs the working time, and improves the portability and operability.

Description

A method for implementing low power consumption of a portable wireless monitoring terminal

technical field

The invention relates to the field of wireless monitoring (measurement) systems, and in particular to a method for realizing low power consumption of a portable wireless testing terminal. The method effectively realizes the intelligentization of the wireless monitoring system and reduces the power consumption of the portable wireless monitoring terminal.

Background technique

With the development of electronic communication technology, portable wireless monitoring (testing) systems are widely used in geological disaster monitoring, medical equipment, astronomy and meteorology, daily life and other fields. Since the portable terminal of the portable wireless monitoring system generally uses a replaceable battery or a rechargeable battery, it has high requirements for power consumption. As for the central processing equipment, there is generally a stable power supply, and the requirements for power consumption can be appropriately relaxed. At present, many portable wireless monitoring systems still have defects such as high power consumption, cumbersome operation, and low intelligence. As a result, in practical applications, the wireless test terminal needs to replace batteries or recharge frequently, and needs to operate to reasonably change the working state of the system, which affects the portability and simplicity of operation of the system.

In practical applications, the monitored object is in a normal state in most cases, and the test data is also very stable. In this case, there is no need for 24-hour uninterrupted testing. In addition, if more data processing can be placed on the central processing unit, the power consumption of the test terminal can also be reduced to a certain extent. However, because the portable wireless monitoring system uses a wireless connection, it faces the contradiction that the test terminal stops working (or enters a dormant state) causing the connection to be interrupted and the central processing unit is used to intelligently control the wireless test terminal. If the control of the central processing unit is not used, the wireless monitoring terminal will work periodically and intermittently, and it will face the contradiction that the danger cannot be detected in time due to the interruption of the work when the monitored object is abnormal. This patent proposes a solution in order to solve these contradictions, so that the main calculation processing and system control of the wireless monitoring system data are completed by the central processing unit, which can intelligently automatically and intermittently monitor objects under normal conditions (low information content) Monitoring to reduce power consumption; when the monitored object has abnormalities or potential abnormalities (higher information content), the monitoring intensity is automatically increased, and continuous monitoring is performed. The purpose of intelligentization, power consumption reduction and effective monitoring has been achieved.

Contents of the invention

A method for realizing low power consumption of a portable wireless monitoring system, adopting a design method in which the data acquisition part is separated from the data processing and result display part, using wireless connection as a link, cleverly using the data acquisition part—the wireless monitoring terminal module has a reset function, and the The reset output signal is transformed into the drive signal of the module control part, thereby controlling the running state of the terminal module. The control module part takes a timer circuit as the core, and periodically outputs low (t1 time) level and high (t2 time) level when there is no reset signal drive, and controls the wireless monitoring terminal to cycle between the working state and the sleeping state. Transformation to achieve the purpose of reducing power consumption. The central processor can reset the wireless monitoring terminal at any time by sending a command in the wireless connection state. If the reset command is sent to the wireless monitoring terminal within t1, the timer control part of the wireless monitoring terminal can be reset, so that the terminal Maintain the working state within the t1 time, and will not enter the dormant state. The central processor can also strengthen or weaken the data collection and transmission strength of the wireless monitoring terminal by sending commands, such as sampling frequency and transmission code rate.

The wireless monitoring terminal has a data acquisition module, a wireless transmission module and a timer control module. The reset drive of the timer control module comes from the reset output of the data acquisition module, and the reset action of the data acquisition module is completed by the central processing unit automatically sending a reset command through a wireless connection under certain conditions through the wireless transmission module. When the reset command is sent from the wireless transmission module to the data acquisition module, the data acquisition module executes the reset. When the data acquisition module resets, the periodic sampling signal of the data acquisition module will be temporarily interrupted, and this periodic sampling signal is led to a monostable trigger circuit, and the monostable time is set appropriately (t>t _S , t represents the monostable time, t _S represents the sampling period) can output a stable level when the periodic sampling signal is normal, and get a pulse signal output as the reset drive of the timer circuit part when the periodic sampling signal is terminated.

The central processor executes data acceptance, calculation processing, and result display. According to the data processing result, when the signal of the wireless terminal module is normal (the amount of information is small), the central processor sends a command to weaken the data collection and transmission intensity of the wireless monitoring terminal module. After the wireless monitoring terminal works for t1 time and enters the dormant state for t2 time, the wireless connection is disconnected, and the central processing unit also enters the dormant time for t2 time, and then the central processing unit actively repeats the request to connect with the wireless monitoring terminal until the connection is successful, and then sends a reset Command to the wireless monitoring terminal to reset it, so as to achieve the synchronization between the wireless monitoring terminal and the central processor state rotation; when the wireless terminal signal is abnormal (large amount of information), the central processor sends a command to the wireless testing terminal to enhance data collection and transmission strength , and send a reset command within a time period less than t1 to reset the wireless monitoring terminal, and will not enter a dormant state for a time period of t2, so as to achieve uninterrupted monitoring of the system.

As a non-limiting example, we designed a portable low-power wireless pulse monitoring system based on the above design ideas. The system uses the mobile phone as the central processor, and the wireless monitoring terminal is composed of a blood oxygen module, a Bluetooth module, and a timer control module, and the mobile phone and the test terminal are connected by Bluetooth. And take this system as a specific design example of the patent.

Description of drawings

Figure 1 is a topology diagram of the wireless monitoring system

Figure 2 is a conversion diagram of the periodic sampling signal realized by the monostable circuit

Figure 3 is a flowchart of the operation of the low power consumption function of the wireless monitoring system

Figure 4 is a flowchart of intelligent power consumption control of the central processing unit

Figure 5 is a topology diagram of a low-power wireless pulse monitoring system

Figure 6 is a flowchart of the operation of the low-power wireless pulse monitoring system

Detailed ways

As shown in Figure 1, the wireless monitoring system includes a central processing unit and a wireless monitoring terminal. The wireless monitoring terminal mainly includes a data acquisition module, a data transmission module and a control module, and the wireless monitoring terminal performs data transmission with the central processing unit through a wireless connection.

As shown in Figure 3 and Figure 4, the specific workflow of the low power consumption realization of the wireless monitoring system is: initialization work, first collect and process data at T1 time, and the central processor judges whether the information is correct or not according to the calculation results. If the information of the monitored object is normal, the wireless monitoring terminal enters the dormant state for T2 time, and the central processor also enters the dormant state for about T2 time. After re-entering the working state, the central processor actively requests wireless connection with the wireless monitoring terminal until the connection is successful. , and then send a command to weaken the data collection and transmission intensity of the wireless monitoring terminal to reduce power consumption, and send a reset command to reset the wireless monitoring terminal to achieve synchronization with the state of the central processor, and so on; if the central processor judges that the monitored object If the data is abnormal, execute the alarm function, send a reset command to the wireless monitoring terminal to reset it, continue to perform the work of the new T1 time, and send a command to enhance the data collection and transmission intensity of the wireless monitoring terminal to improve the effectiveness of monitoring. Such a method can not only enable the wireless monitoring system to monitor intermittently under normal conditions, appropriately reduce data collection and transmission intensity to reduce power consumption, but also enable continuous high-intensity monitoring when abnormalities occur, effectively monitoring possible dangers.

According to Figure 2, the central processing unit sends a reset command to the wireless monitoring terminal, which is transmitted to the data acquisition module through the transmission module to perform reset. At this time, when the periodic sampling signal is reset, the sampling will be temporarily stopped. The periodic sampling signal is input to the monostable flip-flop circuit. During normal periodic sampling, the monostable flip-flop outputs a stable high-level signal. When reset, the periodic sampling signal pauses briefly, so that the monostable flip-flop outputs a low-level pulse. , this pulse signal is used as the reset signal of the timer, so that the timer control circuit is reset.

According to the above design ideas, we designed a low-power wireless pulse monitoring system, as shown in Figure 5. The system uses a mobile phone as the central processing unit, and the terminal monitoring module includes a blood oxygen module, a bluetooth module and a timer control module, which are wirelessly connected to the central processing unit through bluetooth. Combined with Figure 6, the system initially works. First, the software on the mobile phone starts to search for the target Bluetooth device, and then selects and connects. At this time, the mobile phone sends a reset command to the terminal monitoring module, and resets to achieve the state transition of the two modules. Synchronization, and then the wireless monitoring terminal performs data sampling, processing and transmission, and the test data is sent to the mobile phone platform through the Bluetooth connection. The mobile phone performs algorithm calculations and displays the results. Monitor whether the physiological parameters are normal. If the physiological parameters of the monitored person are normal, the software on the mobile phone sends a command to make the terminal monitoring module reduce the sampling frequency to 75Hz and enter a dormant state, and the terminal module also enters a dormant state for about T2. The terminal is connected until the Bluetooth connection is successful, and then a reset command is sent to realize the synchronization of the state transition and enter the next round of testing. This cycle runs in a low-power consumption mode; if the physiological parameters of the monitored person are abnormal, the mobile phone platform The software sends a command to increase the sampling frequency to 300Hz, execute an alarm, and send a reset signal to the terminal module, so that the reset of the terminal module is synchronized with the state transition of the mobile phone platform, so that the uninterrupted real-time and efficient monitoring of potential abnormal monitoring objects can be realized in a timely manner. Spot a dangerous situation.

Claims (5)

1. A method for realizing low power consumption of a portable wireless monitoring terminal, which is characterized in that: based on the internal reset function of the terminal module, a timer module is initialized with a reset signal, and the whole portable wireless terminal is controlled by the timer module, and the information volume is very low It can also be used to reset the drive in a short period of time, so that the wireless terminal can initialize the timer before entering the sleep state, so that the wireless terminal can skip the sleep state and perform uninterrupted monitoring when the information is abnormal. Monitoring; in this way, wireless terminals without a fixed sleep state can reduce power consumption under certain conditions; 2. The method of claim 1, further comprising a combination of the aforesaid sleep state mode and one or more other modes for reducing power consumption (such as by changing the sampling frequency), thereby further optimizing the system power consumption according to the information rate requirement; 3. A portable wireless monitoring terminal intelligent low-power implementation method, which is connected to a central processing device in a wireless manner, and the system working state is set according to the data processing and display results completed by the central processing device, and the central processing unit sends commands. Determine the reset, sampling frequency, link status, etc. of the wireless terminal, combined with claim 1 and claim 2, the system can realize the intelligent automatic control of the wireless terminal, and at the same time realize the low power consumption of the wireless monitoring terminal; 4. based on claim 3, design a wireless pulse monitoring system, take mobile phone as central processing equipment, the software on the mobile phone platform can record wireless information after searching for the wireless (such as bluetooth or WiFi) module of target terminal, in operation It can automatically realize the connection, disconnection and command transmission with the target wireless terminal; 5. Based on claim 4, use the sampling signal of the blood oxygen sensor module to realize an intelligent low-power portable wireless heart pulse monitoring system, integrate software on the mobile phone to effectively analyze the heart pulse data, and when necessary, send Real-time alarm information enables users to get timely assistance.

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