1 Introduction As people's health awareness gradually increases, outdoor sports are receiving more and more attention. However, excessive or insufficient exercise can not achieve the purpose of exercise, and even harm the body. Here is a design method of a multi-functional real-time physiological parameter monitor, which is cheap, practical, portable, and has various functions such as voice broadcast measurement values ​​and over-limit alarms. 2 Overall structure and working principle The monitor uses the Lingyang 16-bit single-chip microcomputer SPCE061A as the control core, and obtains the human body temperature, the number of steps of the runner and the pulse beat condition through the temperature sensor, the mercury switch and the piezoelectric ceramic piece, and then the CPU calculates the measured value in real time and sends the result. To the LCD display, simultaneous voice announcements. The system is equipped with a keyboard, manual reset and automatic power-on reset and hardware watchdog circuit. The SPCE061A has a built-in hardware multiplier function for easy recording, calculation and voice broadcast of measurement data. The overall structure of the system is shown in Figure 1. 3 hardware circuit design 3.1 Body temperature measurement module The temperature sensor uses DALLAS's DS18B20, which requires no external components. It can supply up to 12-bit temperature readings via data lines. The temperature information of the device is sent to or from the DS18B20 via a single-wire interface. The CPU only needs to be connected to the DS18B20. Line. The power required to read, write, and complete the temperature conversion is provided by the data line itself. The measurement range is -55°C~+125°C, and the increment value is 0. 0625 (read temperature in 12-bit value), converts temperature to digital in 1 s (typical), with user-definable non-volatile temperature alarm settings. The output temperature value is read in by the IOA15 port of the microcontroller, as shown in Figure 2. The protocol for accessing the DS18B20 via a single-wire interface is as follows: (1) Initializing all processing on the single-wire bus starts from the initialization sequence. The initialization sequence includes: the bus master issues a reset pulse, and then the slave device sends the presence pulse. For a list of programs, see the initialization DS18B20 subroutine intInit_1820(void). (2) ROM operation command can be issued once the bus master detects the slave device, the ROM operation command, the ROM operation command is 8 bits long, the program sees the DS18B20 subroutine unsignedintRead_1820_Byte(void) and writes the DS18B20 subroutine voidWrite_1820_Byte (unsignedintData). (3) Memory operation command program list See DS18B20 subroutine unsignedintRead_1820_Byte(void) and write DS18B20 subroutine voidWrite_1820_Byte(unsignedintData). (4) For a list of processing data, see the temperature conversion subroutine voidRead_Temp(unsignedint*Data). The temperature measurement procedure is as follows:
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Human physiological parameter monitor design