CN205667544U - Based on AVR and the pulse monitoring device being wirelessly transferred - Google Patents

Abstract

The utility model discloses a pulse monitoring device based on AVR and wireless transmission, comprising: a pulse acquisition module, which monitors the pulse in real time through a pulse sensor; a signal processing module, which filters, amplifies and shapes the pulse signal and then inputs it into a controller; the controller, It is used to process and analyze the pulse data into the display module and upload it to the PC; the display module is used to display the pulse data input by the controller; the wireless transmitting module and the wireless receiving module are used to realize the wireless communication between the controller and the PC. Communication; PC, used to display, record, store and process the pulse signal. The pulse monitoring device of the utility model can realize high pulse collection accuracy, long wireless transmission distance, convenient portability and low energy consumption.

Description

Pulse monitoring device based on AVR and wireless transmission

technical field

The utility model relates to a pulse monitoring device, in particular to a pulse monitoring device based on AVR and wireless transmission, and belongs to the technical field of pulse signal acquisition.

Background technique

Pulse is a common physiological phenomenon in the human body, and it is an external reflection of important information such as the state of the heart and blood vessels. It not only provides physiological reference information for the human body, but also can give a lot of valuable diagnostic information itself. Quantitative analysis of pulse information with sensor testing technology is one of the topics that medical experts at home and abroad are generally concerned about.

In recent years, doctors and scholars in Japan, the United States and other countries have designed some objective pulse tracing instruments or devices in medical research and acupuncture research. The main function of these instruments is to trace pulse waveforms and are used as tools for clinical observation of pulse changes. However, most of these instruments and devices have not formed products, nor have there been reports of widespread clinical applications. Among them, the more representative instruments include a new type of non-invasive pulse wave recorder for clinical acupuncture and moxibustion developed by John. Wen Yan designed a "partially pressurized repayable pulse return device", a CBM-3000/2000 radial artery pulse wave detector developed by Japan's Colin Company, and a Japanese Sony Company that used three resident micrometers. A pulse wave detector with a sounder as a pulse wave sensing element, etc.

At present, a fixed special instrument is usually used to collect the pulse signal, and the instrument mainly transmits data in a wired manner through the PCI parallel or serial port. Chinese patent CN 201675925 U discloses a pulse signal real-time monitoring device, which is a pulse signal detection device for transmitting data through serial port communication; Chinese patent CN 201734700 U discloses a pulse signal detection device for transmitting data with a universal serial bus. The wired signal transmission method is easy to attenuate the signal and be subject to electromagnetic interference, which leads to the distortion of the collected data and limits the activity space of the measured object. Poor scalability and difficult to repair. In addition, the best transmission distance of the current universal serial bus is 5 meters, otherwise the data transmission will be unstable. Wireless data acquisition and transmission technology can reduce the cable connection between systems, has the advantages of flexible distribution, not limited by space conditions, and easy portability, etc. It is widely used in various real-time monitoring, field operations and special occasions.

To sum up, the wireless transmission method provides a new solution for the pulse monitoring device.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art, provide a pulse monitoring device based on AVR and wireless transmission, and solve the technical problem of poor pulse acquisition accuracy and inconvenient transmission in the prior art.

In order to solve the above technical problems, the technical solution adopted in the utility model is: a pulse monitoring device based on AVR and wireless transmission, including:

The pulse acquisition module monitors the pulse in real time through the pulse sensor;

Signal processing module, which filters, amplifies and shapes the pulse signal and then inputs it to the controller;

The controller is used for inputting the pulse data into the display module and uploading to the PC after processing and analyzing the pulse data;

A display module is used to display the pulse data input by the controller;

The wireless transmitting module and the wireless receiving module are used to realize the wireless communication between the controller and the PC;

A PC is used for displaying, recording, storing and processing the pulse signal.

Further, the pulse sensor adopts a finger cuff volumetric photoelectric sensor.

Further, the signal processing module includes a filter circuit, an amplification circuit and a waveform shaping circuit.

Further, the filter circuit is a voltage-controlled voltage source active second-order low-pass filter circuit, including two RC filter circuits and a non-inverting proportional amplifier circuit.

Further, the amplifying circuit is a non-inverting amplifying circuit.

Further, the controller adopts the microcontroller of Atmega8515 series.

Further, the wireless transmitting module and the wireless receiving module are CC1100 series chips.

Further, the display module is a digital tube display.

Compared with the prior art, the beneficial effects achieved by the utility model are:

1. The wireless transceiver module is used to transmit the information between the pulse acquisition controller and the PC, which saves the connection between the monitoring and recording PC equipment and the pulse sensor, so that the measured object can move freely and can collect the monitored The pulse signal in the active state of the patient, the wireless transmission distance is moderate, the power consumption is low, and the anti-interference ability is strong, so that the pulse monitoring device is small in size, simple in structure, easy to carry, and has broad application prospects.

2. The digital tube display is used for real-time observation of pulse data, which is convenient for users to observe and operate.

3. The microprocessor control module adopts Atmega8515 series single-chip microcomputer, which has the characteristics of strong processing ability and low power consumption, and can save energy consumption.

4. The signal collected by the pulse sensor is processed by the filter circuit, amplifier circuit and waveform shaping circuit, which can identify and distinguish small signal quantities, improve the accuracy of pulse collection, make the relative error smaller and the accuracy higher.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the signal acquisition circuit diagram of the pulse acquisition module of the present invention;

Fig. 3 is the filter circuit diagram of the utility model signal processing module;

Fig. 4 is an enlarged circuit diagram of the signal processing module of the present invention.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described. The following examples are only used to illustrate the technical solution of the utility model more clearly, but not to limit the protection scope of the utility model.

As shown in Figure 1, the pulse monitoring device based on AVR and wireless transmission includes: a pulse acquisition module, which monitors the pulse in real time through a pulse sensor; a signal processing module, which filters, amplifies and shapes the pulse signal and then inputs it to the controller; the controller , used to process and analyze the pulse data into the display module and upload it to the PC; the display module is used to display the pulse data input by the controller; the wireless transmitting module and the wireless receiving module are used to realize the communication between the controller and the PC Wireless communication; PC, used to display, record, store and process the pulse signal.

Preferably, the pulse sensor adopts a finger cuff volumetric photoelectric sensor, and the acquisition circuit diagram is shown in Figure 2. D2 is an infrared receiving diode (BPW83 type) and D1 is an infrared emitting diode (IR333 type), and their working wavelengths are both 940nm , In the finger clip, the infrared receiving diode and the infrared emitting diode are placed opposite to obtain the best pointing characteristics. The greater the current in the infrared emitting diode, the smaller the emission angle, and the greater the intensity of the resulting emission. In Figure 2, the choice of R5 to 100 Ω is based on the consideration of the infrared light sensitivity of the infrared receiving diode. If R5 is too large, the current passing through the infrared emitting diode is too small, and the BPW83 infrared receiving diode cannot distinguish between pulsed and non-pulsed signals. Conversely, if R0 is too small, the current passing through is too large, and the infrared receiving diode cannot accurately distinguish the signal when there is pulse or no pulse. When the infrared light emitted by the infrared emitting diode is directly irradiated on the infrared receiving diode, the potential of the inverting input terminal of UB is greater than the potential of the non-inverting input terminal, and Vi is "O". When the finger is in the measurement position, two situations will occur: one is the pulseless period. Although the finger blocks the infrared light emitted by the infrared emitting diode, due to the dark current in the infrared receiving diode, there is still a dark current of 1 μA that will cause the Vi potential to be slightly lower than 2.5 V. The second is the pulse period. When there is a beating pulse, the blood vessels make the light transmittance of the finger worse, the dark current in the infrared receiving diode decreases, and the Vi potential rises. Because infrared is invisible light, it is impossible to intuitively know whether it is turned on when it is connected to the power supply, so an indicator light is connected behind R5 to judge whether it is working normally.

Therefore, the acquisition of the pulse signal is actually obtained through the infrared receiving diode, the weak change of the dark current when there is pulse and no pulse, and then amplified by UB. The collected signal is a voltage signal of about 2 μV.

The pulse acquisition signal is sequentially connected in series with a filter circuit, an amplifier circuit and a waveform shaping circuit for signal processing and then input to the controller. Filtering circuit shown in Figure 3, voltage-controlled voltage source (VCVS) active second-order low-pass filter circuit. It consists of two RC filter circuits and an in-phase proportional amplifier circuit. The signal is input from the in-phase end of the operational amplifier, so the input impedance of the filter is very large, and its output impedance is small. The advantage is that the circuit performance is relatively stable and the gain is easy to adjust.

The amplifying circuit is shown in Figure 4. After the signal passes through the filter circuit, the strong 50Hz interference signal of the power supply has been filtered out. He inputs from terminal 2 of C9, and C9 filters the signal again to further filter out the dark current left before. Operational amplifier OP07, R15 and R17 form a main circuit with adjustable magnification. In order to prevent the amplified voltage from being higher than the +5V voltage that the MCU can handle, only 5V is provided to the operational amplifier OP07 as the power supply voltage, so that when the signal is amplified beyond 5V, it is only 5V. The signal after the filtering and amplifying circuit has high and low levels, which can be recognized by the MCU system, but it is not a perfect square wave, so it is converted into a perfect square wave signal through a waveform shaping circuit.

Preferably, the controller adopts a microcontroller of the Atmega8515 series. The ATmega8515 is a low-power 8-bit CMOS microcontroller based on the enhanced AVRRISC architecture. Due to its advanced instruction set and single clock cycle instruction execution time, the ATmega8515 has a data throughput rate of up to 1 MIPS/MHz, has the characteristics of strong processing capability and low power consumption, and can save energy consumption.

Further, the wireless transmitting module and the wireless receiving module are CC1100 series chips. The wireless transceiver module adopts the CC1100 chip produced by ETC Company. The characteristics of this chip are: CC1100 is a low-cost true single-chip UHF transceiver designed for low-power wireless applications. The circuit is primarily set for the ISM (Industrial, Scientific and Medical) and SRD (Short Range Device) frequency bands at 315, 433, 868 and 915MHz, but can also be easily set for 300-348 MHz, 400-464MHz and 800-928 other frequencies in MHz.

Preferably, the display module is a digital tube display, which can observe pulse data in real time.

When the wireless transceiver module is not connected to the PC, the pulse acquisition module, signal processing module, controller and display module form an improved portable pulse monitoring device, which can be carried around and display the pulse rate in real time, which is small and convenient. When connected to a PC through a wireless transceiver module, the system constitutes a real-time pulse signal monitoring and recording system.

The above is only the preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the utility model, some improvements and deformations can also be made. And deformation should also be regarded as the protection scope of the present utility model.

Claims (5)

1. The pulse monitoring device based on AVR and wireless transmission is characterized in that it comprises: The pulse acquisition module monitors the pulse in real time through the pulse sensor; Signal processing module, which filters, amplifies and shapes the pulse signal and then inputs it to the controller; The controller is used for inputting the pulse data into the display module and uploading to the PC after processing and analyzing the pulse data; A display module is used to display the pulse data input by the controller; The wireless transmitting module and the wireless receiving module are used to realize the wireless communication between the controller and the PC; PC, used to display, record, store and process the pulse signal; The pulse sensor adopts a finger cuff volumetric photoelectric sensor, and the volumetric photoelectric sensor includes an infrared receiving diode and an infrared emitting diode, and the infrared receiving diode and the infrared emitting diode are relatively placed; The signal processing module includes a filtering circuit, an amplifying circuit and a waveform shaping circuit; The filter circuit is a voltage-controlled voltage source active second-order low-pass filter circuit, which includes two RC filter circuits and an in-phase proportional amplifier circuit. 2. The pulse monitoring device based on AVR and wireless transmission according to claim 1, wherein the amplifying circuit is a non-inverting amplifying circuit. 3. The pulse monitoring device based on AVR and wireless transmission according to claim 1, wherein said controller adopts the microcontroller of Atmega8515 series. 4. The pulse monitoring device based on AVR and wireless transmission according to claim 1, wherein the wireless transmitting module and the wireless receiving module are CC1100 series chips. 5. The pulse monitoring device based on AVR and wireless transmission according to claim 1, wherein the display module is a digital tube display.