Design of Wireless Heart Rate Measurement System Based on LabVIEW
Design and implement a wireless heart rate measurement system based on LabVIEW for the development platform. The HKG-07B infrared pulse sensor is used to collect the ECG signal. After the signal is amplified, filtered, shaped, and AD converted, the heart rate is displayed by the LED, and sent to the PC terminal through the wireless, and the heart rate waveform is collected, displayed, and stored in the terminal signal through the LabVIEW. The heart rate waveform can be called at any time. The design is small in size, good in real-time and friendly in human-machine interface. Heart rate measurement is one of the commonly used medical examination items and an important indicator of human health monitoring. The core chip used in current home heart rate measurement system is single-chip microcomputer. The product designed by this development method is easy to carry, but it is difficult. The heart rate waveform is stored efficiently in real time. The heart rate test system using LabVIEW not only can measure heart rate in real time, display heart rate waveform, but also conveniently store heart rate waveform, which is convenient for subsequent algorithm processing. 1 System structure and principle The system uses the infrared sensor HKG-07B to collect the heart rate signal. After amplification and filtering, A/D conversion, the data is calculated by the MCU and displayed by LED, and the A/D converted data is sent to the PC terminal through WIFI, and used on the PC terminal. LabVIEW displays waveforms, stores data, and alerts via the network. The system structure diagram is shown in Figure 1. Figure 1 system structure diagram 2 LABVIEW acquisition display memory module design The heart rate graph received by the PC is collected and displayed by LABVIEW, and the length of time can be selected. The front panel interface is shown in Figure 2. Figure 2 LabVIEW front panel interface When collecting, the serial port will be initialized and detected if data is received. If not, continue to wait. Its block diagram is shown in Figure 3. Figure 3 serial port initialization After the serial port parameters are set, the acquisition module is executed, the data sent from the serial port is read, the received string data is converted into ASCII code, and then converted into a voltage volt value. Since the data received by the computer is 8-bit binary, ie 0~255, its corresponding volts is (U/255)×5 and input to the display waveform display. As shown in Figure 4. Figure 4 character conversion After the string data is converted to ASCII code, an array is created, a waveform is created, and the frequency of the input waveform is detected according to the waveform measurement module. When the frequency is multiplied by 60, the heart rate per minute can be obtained. As shown in Figure 5. Figure 5 pulse count operation In order to facilitate the subsequent call of historical data, the collected data is saved. Convert the ASCII code to a decimal voltage value and save it to a spreadsheet, as shown in Figure 6. Figure 6 storage module Select the playback mode when calling historical data, read the saved file, convert it into an array, and display the waveform of the selected segment data, as shown in Figure 7. Figure 7 playback module
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