CN201394010Y - body temperature recorder - Google Patents

Abstract

The utility model proposes a body temperature recorder, which at least includes a temperature measuring part, and the temperature measuring part includes a temperature measuring housing and a first circuit unit; the temperature measuring housing is composed of an upper temperature measuring housing and a lower temperature measuring housing The upper surface of the upper temperature measuring housing is provided with three metal contacts, and the lower surface of the lower temperature measuring housing is provided with metal sheets; the first circuit unit is accommodated in the temperature measuring housing, located between the upper temperature measuring housing and the Between the lower temperature measuring housings, the first circuit unit includes a battery, a crystal oscillator, a microcontroller, a first resistor, a thermistor, and a first capacitor; the microcontroller includes a power input terminal, a clock input terminal, a second One I/O, second I/O, memory, RS232 serial input terminal, RS232 serial output terminal; the battery is electrically connected to the power input terminal of the microcontroller, and the crystal oscillator is electrically connected to the clock input terminal of the microcontroller. The first end of the first resistor is electrically connected to the first I/O output end of the microcontroller, the second end of the first resistor is electrically connected to the first end of the first capacitor, and the first end of the thermistor is connected to the microcontroller. The second I/O output end of the controller is electrically connected, the second end of the thermistor is electrically connected to the first end of the first capacitor, and the second end of the capacitor is grounded; the thermistor is connected to the lower temperature measuring The metal sheets set on the outside of the shell are in contact; among the three metal contacts set on the outside of the upper temperature measuring shell, the third contact is electrically connected to the RS232 serial input terminal of the microcontroller, and the second contact is connected to the microcontroller The RS232 serial output of the device is electrically connected, and the first contact is grounded. Because the memory is used to store the collected temperature data, the body temperature recorder can continuously record the temperature data.

Description

body temperature recorder

technical field

[01] The utility model relates to a body temperature recorder, in particular to a body temperature recorder capable of storing body temperature data.

Background technique

[02] At present, thermometers are mainly divided into three categories: mercury thermometers, infrared thermometers and electronic thermometers. The disadvantage of mercury thermometers is the presence of mercury contamination. The disadvantage of infrared thermometers is that they are not very accurate and are greatly affected by body parts and external temperature. Electronic thermometers can well solve the defects of the aforementioned two types of thermometers, but the existing electronic thermometers cannot perform continuous measurement, let alone have data storage capabilities, which is very troublesome for the situation where long-term observation of body temperature data is required.

Utility model content

[03] The utility model aims to propose a body temperature recorder capable of continuously measuring body temperature.

[04] In order to achieve the above object, the body temperature recorder of the present utility model includes a temperature measurement part, and the temperature measurement part includes a temperature measurement housing and a first circuit unit; the temperature measurement housing is composed of an upper temperature measurement housing and a lower temperature measurement housing. Composed of a temperature measuring housing, the upper surface of the upper temperature measuring housing is provided with three metal contacts, and the lower surface of the lower temperature measuring housing is provided with metal sheets; the first circuit unit is contained in the temperature measuring housing and is located on the upper temperature measuring housing. Between the shell and the lower temperature measuring shell, the first circuit unit includes a battery, a crystal oscillator, a microcontroller, a first resistor, a thermistor, and a first capacitor; the microcontroller includes a power input terminal, a clock input terminal, the first I/O, the second I/O, memory, RS232 serial input terminal, RS232 serial output terminal and voltage comparator, interrupt input terminal; the battery is electrically connected to the power input terminal of the microcontroller, and the crystal oscillator It is electrically connected to the clock input end of the microcontroller, the first end of the first resistor is electrically connected to the first I/O output end of the microcontroller, and the second end of the first resistor is electrically connected to the first end of the first capacitor. Connecting, the first end of the thermistor is electrically connected to the second I/O output end of the microcontroller, the second end of the thermistor is electrically connected to the first end of the first capacitor, and the second end of the capacitor is grounded; The thermistor is in contact with the metal sheet set on the outside of the lower temperature-measuring housing; among the three metal contacts on the outside of the upper temperature-measuring housing, the third contact is connected to the RS232 serial input of the microcontroller Terminals are electrically connected, the second contact is electrically connected to the RS232 serial output of the microcontroller, and the first contact is grounded; the non-inverting input of the voltage comparison is electrically connected to the first end of the first capacitor, and the inverting input The reference voltage is connected, and the comparison result of the voltage comparator is sent to the interrupt input terminal of the microcontroller as an interrupt signal.

[05] Preferably, it further includes a base part, the base part includes a base shell and a second circuit unit; the base shell is composed of an upper base shell and a lower base shell, and the upper surface of the upper base shell is formed with A depression corresponding to the shape of the upper temperature-measuring housing and three metal contacts corresponding to the three metal contacts provided on the upper surface of the upper temperature-measuring housing; the second circuit unit Accommodated in the base shell, located between the upper base shell and the lower base shell, the second circuit unit includes an RS232-USB interface conversion circuit and a USB plug connector, and the RS232-USB interface conversion circuit includes an RS232 input terminal , RS232 output terminal, USD input terminal and USB output terminal, the first metal contact is electrically connected to the RS232 output terminal of the RS232-USB interface conversion circuit, and the second metal contact is connected to the RS232 input terminal of the RS232-USB interface conversion circuit Electrically connected, the third metal contact is grounded; the USB input end and the USB output end are respectively electrically connected to the USB plug connector.

[06] Optionally, a base part is further included, the base part includes a base shell and a third circuit unit; the base shell is composed of an upper base shell and a lower base shell, and the outer side of the upper base shell is provided with Three metal contacts corresponding to the three metal contacts provided on the outside of the upper temperature measuring housing; the third circuit unit is accommodated in the base housing, located between the upper base housing and the lower base housing Between the bodies, the third circuit unit includes an RS232 level conversion circuit and an RS232 plug connector, and the RS232 level conversion circuit includes a first RS232 input terminal, a first RS232 output terminal, a second RS232 input terminal, and a second RS232 output terminal ; The third metal contact is electrically connected to the first RS232 output end of the RS232 level conversion circuit, the second metal contact is electrically connected to the first RS232 input end of the RS232 level conversion circuit, and the first metal contact is grounded; The second RS232 input terminal and the second RS232 output terminal are respectively electrically connected to the RS232 plug connectors.

[07] Preferably, an adhesive sheet is further detachably provided on the outside of the upper temperature measuring housing, the upper temperature measuring housing is located at the center of the first side of the adhesive sheet, and the periphery of the first side of the adhesive sheet is provided with Waterproof viscose.

[08] Preferably, the first circuit unit further includes a buzzer.

[09] Because the memory is used to store the collected temperature data, the body temperature recorder can continuously record the temperature data. Due to the contacts and base used for data export in the temperature measurement part, the measured data can be easily exported to the computer for further processing or storage.

Description of drawings

[10] The above and other objects, features and advantages of this utility model will be apparent from the following description of the gist of the utility model and the preferred embodiments of its use and accompanying drawings, in the accompanying drawings:

[11] Fig. 1 is an embodiment of the first circuit unit of the present utility model;

[12] Fig. 2 is the second circuit unit embodiment of the present utility model;

[13] Fig. 3 is an embodiment of the third circuit unit of the present utility model;

[14] Fig. 4 is a three-dimensional schematic diagram of the temperature measuring part of the body temperature recorder of the present invention;

[15] Figure 4a is a top view of the upper temperature measuring housing;

[16] Figure 4b is a bottom view of the lower temperature measuring housing;

[17] FIG. 5 is a three-dimensional schematic diagram of the base part;

[18] Fig. 6 is the bottom view of pasting sheet;

[19] Figure 7 is the schematic diagram of temperature measurement.

Detailed ways

[20] First, the basic temperature measurement principle of the utility model is described. As shown in Figure 7, the utility model is implemented by a single-chip microcomputer (MCU), instead of the traditional temperature measurement scheme composed of an amplifier and an AD converter, so the power consumption is very low, and it is suitable for continuous temperature measurement for a long time. P1.0 and P1.1 are the I/O ports of the single-chip microcomputer, Rf is a precision resistor, Rt is an NTC thermistor with a precision of 1%, and Ct is a ceramic capacitor. When the temperature measurement starts, first set P1.1 to a high resistance state, set P1.0 to a high level, and charge C to a high level V _H through Rt. The timer TA starts to work, P1.1 is set low, the capacitor is discharged through Rt, the level of CA0 terminal starts to drop, the comparator compares CA0 with the reference voltage Vref=0.25Vcc, when the voltage of CA0 terminal reaches Vref, an interrupt is generated, TA Stop timing and record the discharge time t1. The same steps can be used to measure the discharge time of C through Rf as t2. According to the discharge time t formula of capacitor C:

[twenty one] $V_{\mathrm{ref}}=V_h{e}^{-\frac{t}{\mathrm{RC}}},$

[22] Available $\frac{t_{}}{}$$\frac{{}_1}{\mathrm{Rt}}=\frac{{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="Y2009201577440011H1.png,Y2009201577440011H2.png"\; state="\{\{state\}\}">t</figure-callout>}}_2}{\mathrm{Rf}},$ Right now $\mathrm{Rt}=\frac{t_1}{{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="Y2009201577440011H1.png,Y2009201577440011H2.png"\; state="\{\{state\}\}">t</figure-callout>}}_2}\mathrm{Rf},$

[23] According to the calculation formula of NTC thermistor material constant B value: $B=\frac{\ln R1-\mathrm{<figure-callout\; id="2"\; label="ln\; R"\; filenames="Y2009201577440011H1.png,Y2009201577440011H2.png"\; state="\{\{state\}\}">ln</figure-callout>}R2}{\frac{1}{T1}-\frac{1}{\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="Y2009201577440011H1.png,Y2009201577440011H2.png"\; state="\{\{state\}\}">T</figure-callout>}2}},$

[24] can get the temperature value $\mathrm{Tt}=\frac{1}{\frac{\ln \mathrm{Rt}-\ln R2}{B}+\frac{1}{\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="Y2009201577440011H1.png,Y2009201577440011H2.png"\; state="\{\{state\}\}">T</figure-callout>}2}},$ Among them, R2 is the resistance value under the absolute temperature T2.

[25] The accuracy of this temperature measurement method is mainly determined by the following three factors: the accuracy of the microcontroller timer; the resistance accuracy of Rref and Rt. Below we focus on the impact of the microcontroller timer accuracy on the measurement accuracy.

[26] By the capacitor discharge formula $V_{\mathrm{ref}}=V_h{e}^{-\frac{t}{\mathrm{RC}}},$ Available $t_T=-R_{T}C\ln \frac{V_{\mathrm{ref}}}{V_h}$

[27] Clinically, the body temperature accuracy is required to reach 0.1°C, and the timer accuracy is expressed as the derivative of t to ΔT=0.1°C: $\frac{{\mathrm{dt}}_T}{\mathrm{dT}}=-\ln \frac{V_{\mathrm{ref}}}{V_h}\&Center\; Dot;C\frac{d_T}{\mathrm{dT}}$

[28] In the above formula, we believe that R _T basically satisfies the linear relationship of T between 30°C and 45°C, namely

[29] into the above formula

[30] In this scheme, the substitution data can be obtained $\frac{{\mathrm{dt}}_T}{\mathrm{dT}}=2.3095\&times;{10}^{-4},$ That is, to ensure that the temperature resolution is 0.1°C, the counting resolution of the timer is at least lower than 2.3095×10 ^-4 s. We choose the commonly used 32kHz watch crystal oscillator to provide the counting frequency for the timer. The resolution of the timer is:

[31] $\frac{{\mathrm{dt}}_T}{\mathrm{dT}}=\frac{1}{32\&times;{10}^3}=3.2\&times;{10}^{-5}<2.3095\&times;{10}^{-4}$

[32] The derivation from the above formula proves that the 32kHz counter frequency can meet the requirement of the system temperature resolution of 0.1°C.

[33] As shown in Figure 4, it is a three-dimensional schematic diagram of the temperature measuring part 10 of the body temperature recorder of the present invention. The temperature measuring part 10 includes an upper temperature measuring housing 11 and a lower temperature measuring housing 12, the upper temperature measuring housing 11 is fitted on the lower temperature measuring housing 12, and the upper temperature measuring housing 11 and the lower temperature measuring housing A hollow portion is formed between 12 for accommodating the first circuit unit. The upper surface of the upper temperature measuring housing 11 is provided with three metal contacts for data transmission. The lower surface of the lower temperature measuring housing 12 is provided with a metal sheet 13 for surface contact with the part to be measured. When in use, the temperature measuring part is pasted on the surface of the part to be measured by the pasting sheet 30 shown in Figure 6, such as the skin surface of the human body, so that the metal sheet 13 is fully in contact with the skin, and at this time, three metal contacts are provided. The upper surface of the upper temperature measuring housing 11 is completely covered by the adhesive sheet 30, and the lower surface of the adhesive sheet 30 is coated with waterproof glue for bonding the adhesive sheet to the skin. The material of the adhesive sheet 30 can be non-woven fabric or other paper materials, on the one hand, it is used to fix the temperature measuring part 10 on the skin surface, and on the other hand, it can play a role in isolating the skin part of the temperature to be measured from the outside world, so that the measured temperature The temperature is less affected by the external temperature, and it reflects the actual temperature more objectively.

[34] as shown in Figure 5 is the base part. The main purpose of the base section is to export the measured temperature data. The base part includes an upper base shell and a lower base shell, and the upper surface of the upper base shell forms a depression 21 corresponding to the shape of the upper temperature measuring shell 11 of the temperature measuring part, which is used to accommodate the upper temperature measuring shell when transmitting data Body 11, which is formed in the recess with three metal contacts 24 adapted to the positions of the three metal contacts of the upper temperature-measuring housing, so as to form an electrical connection with the three metal contacts, so that the temperature-measuring part Export the measured temperature data. A hollow is formed between the upper base shell and the lower base shell for accommodating the second circuit unit or the third circuit unit. The base part is also provided with a USB port or an RS232 port 25 for connecting with a computer on its side.

[35] As shown in Figure 1, the first circuit unit accommodated between the upper temperature-measuring housing 11 and the lower temperature-measuring housing 12 includes a battery VCC3, a crystal oscillator XTAL, and the microcontroller here is MSP430F435, the first Resistor Rref, thermistor Rt, first capacitor Ct; the microcontroller MSP430F435 includes a power input terminal, a clock input terminal, a first I/O, a second I/O, a memory, an RS232 serial input terminal, and an RS232 string Line output terminal and voltage comparator; the battery Vcc3 is electrically connected to the power input terminal of the microcontroller MSP430F435, the crystal oscillator XTAL is electrically connected to the clock input terminal of the microcontroller MSP430F435, and the first end of the first resistor Rref is connected to the microcontroller MSP430F435 The first I/0 output terminal P1.0 of the first resistor Rref is electrically connected to the first terminal of the first capacitor Ct, the first terminal of the thermistor Rt is electrically connected to the first terminal of the microcontroller MSP430F435 The two I/O output terminals P1.1 are electrically connected, the second end of the thermistor Rt is electrically connected to the first end of the first capacitor Ct, the second end of the capacitor Ct is grounded; the first end of the first capacitor Ct is connected to The non-inverting input terminal P1.6 of the voltage comparator, the inverting input terminal of the voltage comparator is connected to the reference voltage; the thermistor Rt is in contact with the metal sheet 13 set on the lower surface of the lower temperature measuring housing; the upper measuring Among the three metal contacts set on the upper surface of the temperature shell, the third contact is electrically connected to the RS232 serial input terminal P2.4 of the microcontroller MSP430F435, and the second contact is connected to the RS232 serial output terminal of the microcontroller MSP430F435 P2.5 is electrically connected, and the first contact is grounded. What needs to be pointed out here is that the utility model is not limited to MSP430F435, as long as it is a microcontroller compatible with its function and performance. The microcontroller MSP430F435 also includes a buzzer for alarming when the temperature exceeds the alarm limit.

[36] MSP430F435 is a 16-bit microcontroller. It is packaged in 80-pin PQFP and has the characteristics of small size and low power consumption. When the module is working, except for the temperature measurement operation, the MCU is in standby mode to ensure the continuous use of the battery for a long time. MSP430F435 also has sufficient hardware resources, including 60kB+256B Flash, 2K RAM. In addition to the program space, the single-chip microcomputer stores all the body temperature data in 50kB FLASH, each data occupies 2 bytes, and the temperature is measured every 2 minutes, and the data of 30 days can be retained. After computer configuration, the MCU can also drive a miniature buzzer. When the measured body temperature is found to be too high, the buzzer will sound an alarm at regular intervals to remind the subject.

[37] The main working procedures of MSP430F435 are as follows: step 1, power on; step 2, system initialization; step 3, open the USART port interrupt; step 4, call the capacitor discharge subroutine to get Rt discharge time t1; step 5 , call the capacitor discharge subroutine to get the Rref discharge time t2; Step 6, calculate Rref and T; Step 7, store the data in the memory; Step 8, judge whether the temperature exceeds the alarm limit, if "Yes", go to Step 9 , make a buzzer alarm; if "No", go back to step 4.

[38] Among them, the capacitor discharge sub-program is as follows: Step 1, set the port high, and charge the capacitor; Step 2, delay 50ms; Step 3, set the port low, discharge the capacitor; Step 4, clear the counter, and The comparator starts counting; step 5, enable the comparator interrupt; step 6, the MCU is in the LPM3 low power consumption mode; step 6, the comparator generates an interrupt and wakes up the MCU; step 7, the timer stops counting; step 8 , returns the count value.

[39] An embodiment of the second circuit part is shown in FIG. 2 . The second circuit unit includes an RS232-USB interface conversion circuit and a USB plug connector, and the RS232-USB interface conversion circuit is realized with an SPCP825A chip, which includes an RS232 input terminal RXD, an RS232 output terminal TXD, a USB input terminal and a USB output terminal. The three metal contacts are electrically connected to the RS232 output terminal TXD of the RS232-USB interface conversion circuit, the second metal contact is electrically connected to the RS232 input terminal RXD of the RS232-USB interface conversion circuit, and the first metal contact is grounded; USB input The terminal DP and the USB output terminal DM are respectively electrically connected to the USB plug connector port1. What needs to be pointed out here is that the utility model is not limited to realizing the RS232-USB interface conversion circuit with the SPCP825A chip, and other chips or circuits with compatible functions and performances can be used.

[40] The SPCP825A chip provides a new USB-to-UART single-chip solution, which integrates a full-speed functional controller, a buffer, and an asynchronous serial data bus with a modem interface signal that conforms to the USB1.1 standard. It also has a The integrated internal clock and USB transceiver eliminates the need for other external USB circuit components. The interface between the base and the computer is flexible, and it can be powered by direct USB. After the computer is installed with the SPCP825A driver, a COM port is automatically virtualized. The software on the computer side accesses the SPCP825A-based device by accessing the standard hardware COM port. The communication between SPCP825A and the temperature measurement part meets the RS232 protocol, realizing full-duplex asynchronous serial communication, and the baud rate is 19200bps.

[41] An embodiment of the third circuit part is shown in FIG. 3 . The third circuit unit serves as an alternative form of the second circuit unit, and accordingly, the plug is also replaced with an RS232 plug here. The third circuit unit is accommodated in the base shell, between the upper base shell and the lower base shell, and the third circuit unit includes an RS232 level conversion circuit and an RS232 plug connector J1, RS232 level conversion The circuit is realized here by using the MAX3232 chip, but the utility model is not limited to this chip, and chips with compatible functions and performances are all available. The RS232 level conversion circuit includes the first RS232 input terminal R20UT, the first RS232 output terminal T2IN, the second RS232 input terminal R2IN, the second RS232 output terminal T20UT; the third metal contact and the first RS232 output of the RS232 level conversion circuit The terminal R20UT is electrically connected, the second metal contact is electrically connected to the first RS232 input terminal T2IN of the RS232 level conversion circuit, and the first metal contact is grounded; the second RS232 input terminal and the second RS232 output terminal are respectively electrically connected Connects to RS232 plug connector.

[42] Since the utility model uses a memory to store the collected temperature data, the body temperature recorder can continuously record the temperature data. Due to the contacts and base for data export in the temperature measurement part, the measured data can be easily exported to the computer for further processing or storage.

[43] While preferred embodiments of the invention have been shown and described, it is contemplated that various modifications of the invention can be devised by those skilled in the art within the spirit and scope of the appended claims.

Claims (5)

1. A body temperature recorder, comprising: a temperature measuring part; The temperature measuring part includes a temperature measuring housing and a first circuit unit; the temperature measuring housing is composed of an upper temperature measuring housing and a lower temperature measuring housing, and the upper surface of the upper temperature measuring housing is provided with three metal contacts, A metal sheet is provided on the lower surface of the lower temperature-measuring housing; the first circuit unit is housed in the temperature-measuring housing and is located between the upper temperature-measuring housing and the lower temperature-measuring housing, and the first circuit unit includes a battery, Crystal oscillator, microcontroller, first resistor, thermistor, first capacitor; said microcontroller includes power input terminal, clock input terminal, first I/O, second I/O, memory, RS232 serial input terminal, RS232 serial output terminal and voltage comparator, and interrupt input terminal; the battery is electrically connected to the power input terminal of the microcontroller, the crystal oscillator is electrically connected to the clock input terminal of the microcontroller, and the first terminal of the first resistor is connected to the microcontroller The first I/O output end of the controller is electrically connected, the second end of the first resistor is electrically connected to the first end of the first capacitor, and the first end of the thermistor is connected to the second I/O output of the microcontroller. Terminals are electrically connected, the second end of the thermistor is electrically connected to the first end of the first capacitor, and the second end of the capacitor is grounded; Contact: Among the three metal contacts set outside the upper temperature measuring shell, the third contact is electrically connected to the RS232 serial input terminal of the microcontroller, and the second contact is electrically connected to the RS232 serial output terminal of the microcontroller , the first contact is grounded; the non-inverting input terminal of the voltage comparison is electrically connected to the first terminal of the first capacitor, the inverting input terminal is connected to the reference voltage, and the comparison result of the voltage comparator is sent to the micro The interrupt input of the controller. 2. The body temperature recorder according to claim 1, further comprising a base portion, the base portion comprising a base housing and a second circuit unit; the base housing is composed of an upper base housing and a lower base housing The upper surface of the upper base housing is formed with a depression corresponding to the shape of the upper temperature measuring housing and there are three metal contacts corresponding to the three metal contacts on the upper surface of the upper temperature measuring housing. Metal contacts; the second circuit unit is accommodated in the base housing, between the upper base housing and the lower base housing, the second circuit unit includes an RS232-USB interface conversion circuit and a USB plug connector, The RS232-USB interface conversion circuit includes an RS232 input terminal, an RS232 output terminal, a USD input terminal and a USB output terminal, the first metal contact is electrically connected to the RS232 output terminal of the RS232-USB interface conversion circuit, and the second metal contact is connected to the RS232 - the RS232 input terminal of the USB interface conversion circuit is electrically connected to each other, and the third metal contact is grounded; the USB input terminal and the USB output terminal are respectively electrically connected to the USB plug connector. 3. The body temperature recorder according to claim 1, further comprising a base portion, the base portion comprising a base housing and a third circuit unit; the base housing is composed of an upper base housing and a lower base housing The outer side of the upper base housing is provided with three metal contacts corresponding to the three metal contacts provided on the outer side of the upper temperature measuring housing; the third circuit unit is accommodated in the base housing, Located between the upper base shell and the lower base shell, the third circuit unit includes an RS232 level conversion circuit and an RS232 plug connector, and the RS232 level conversion circuit includes a first RS232 input terminal, a first RS232 output terminal, a second RS232 input terminal, second RS232 output terminal; the third metal contact is electrically connected to the first RS232 output terminal of the RS232 level conversion circuit, and the second metal contact is electrically connected to the first RS232 input terminal of the RS232 level conversion circuit connected, the first metal contact is grounded; the second RS232 input terminal and the second RS232 output terminal are respectively electrically connected to the RS232 plug connector. 4. The body temperature recorder according to claim 1, 2 or 3, characterized in that: an adhesive sheet is further detachably provided on the outside of the upper temperature-measuring housing, and the upper temperature-measuring housing is located on the first side of the adhesive sheet. The center of the side, and the periphery of the first side of the adhesive sheet is provided with waterproof adhesive. 5. The body temperature recorder according to claim 4, wherein the first circuit unit further comprises a buzzer.

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