CN2539962Y

CN2539962Y - Intelligent digital thermometer with USB mouth

Info

Publication number: CN2539962Y
Application number: CN 02232043
Authority: CN
Inventors: 王海涛; 马宁
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-04-19
Filing date: 2002-04-19
Publication date: 2003-03-12
Anticipated expiration: 2012-04-19

Abstract

The utility model provides an intelligent digital thermometer with a USB interface and digitalizes all the temperature signals stored, processed and displayed through temperature acquisition and analog-digital conversion circuit, and the digital value is processed, stored and displayed by a MCU. The utility model also has a USB interface and communicates a computer, and transmits the stored data to the computer so as to conduct more in-depth statistics and management.

Description

The intelligent digital clinical thermometer of band USB mouth

The utility model relates to a kind of digital clinical thermometer.

At present, the digital body thermometer that can see on the market all is simply the body temperature of measuring to be shown with numeral, is not digital body thermometer completely, does not more embody numeral and is convenient to the advantage of handling and storing, can't remember and store after the measurement, also be inconvenient to add up.

In order to solve the shortcoming that existing digital body thermometer is memoryless, can not store and be not easy to add up, the utility model provides a kind of intelligent digital clinical thermometer with the USB mouth, this digital body thermometer is take temperature accurately, and the data storage of reading can be got off, and add up and manage by USB interface input computer.

The technical scheme that its technical matters that solves the utility model adopts is: use platinum filament as temperature-sensing element (device), transfer digital signal to the voltage on the modulus conversion chip collection platinum filament and with it, with single-chip microcomputer digital signal is reduced into temperature value again, simultaneously some basic conditions such as time of measuring, temperature, patient are stored in the storage chip, import computing machine into by the USB control chip at last.Can data be made form with application program on computers, be convenient to filing and statistics.

The beneficial effects of the utility model are, can and add up the data storage after measuring, and are convenient to medical institutions such as hospital and manage.

Below in conjunction with accompanying drawing and enforcement the utility model is further specified.

Fig. 1 is a schematic block circuit diagram of the present utility model

Fig. 2 is circuit theory diagrams of the present utility model

Fig. 3 is the software architecture diagram of the utility model single-chip microcomputer

As shown in Figure 1, the principle of work of this circuit is, temperature collection circuit is converted to magnitude of voltage with temperature value, analog to digital conversion circuit is converted to this magnitude of voltage digital quantity again and handles for single-chip microcomputer 78E52, single-chip microcomputer 78E52 is reduced to temperature value with digital quantity earlier and is stored by memory circuit, temperature value is shown by liquid crystal display circuit again.Last single-chip microcomputer 78E52 can carry out communication by usb circuit and computing machine, and data are passed to computing machine.Reset circuit is in order to guarantee that circuit can normally move.Can set the function of function key group by programming, to realize various purposes.

In Fig. 2, platinum resistance (R2) links to each other with a precision resistance (R3), links to each other with the temperature and pressure circuit of being exported by TCL431 (D2) simultaneously, and TCL431 (D2) provides the burning voltage of a 2.495V for platinum resistance.Because the temperature characterisitic of precision resistance is very little, and contact thermography head not, therefore resistance is almost constant, and platinum resistance has the characteristic that varies with temperature and change resistance, utilize this characteristic to transfer temperature variation to change in resistance, thereby transfer change in voltage to, analog to digital conversion circuit ADC0804 (U2) regularly gathers this voltage under the control of single-chip microcomputer 78E52 (U3).

ADC0804 (U2) is 8 continous way analog to digital conversion circuits.ADC0804 (U2) will send the analog voltage that comes to and be converted into digital signal and pass to single-chip microcomputer 78E52 (U3).78E52 (U3) is a kind of single-chip microcomputer of WINBOND company design, and it is compatible with 8051, and there are the FLASH ROM of 4K byte and the RAM of 128 bytes in inside, and programmable UART port.The pairing temperature value of certain digital quantity can be plotted among the FLASH ROM that shows to write among the 78E52 (U3), after 78E52 (U3) receives digital quantity, need only like this and just can calculate corresponding temperature value by tabling look-up.Last 78E52 (U3) shows temperature value by circuit (U4) on liquid crystal display.Liquid crystal display circuit (U4) is the standard LCD MODULE, and it comprises one 4 LCDs and liquid crystal drive and control circuit.When measuring, 78E52 (U3) can also deliver to some data such as temperature, time among the storage chip 24C08 (U5) and preserve.24C08 (U5) is the EEPROM of serial, and 78E52 (U3) can reading and writing 24C08 (U5) by one one of serial data line.78E52 (U3) is by USB interface chip CY7C63722 (U1) and interface (J1) and computing machine communication.CY7C63722 (U1) is the USB control chip, and it and 78E52 (U3) are by the mutual Data transmission of programmable serial ports, and 1 pin of CY7C63722 (U1) and 15 pin are respectively RXD and TXD pin.USB interface is one of now more common interface, and it is faster than the speed of serial ports, connects simply simultaneously, can realize plug and play.Just can utilize USB mouth and computing machine to carry out communication by CY7C63722 (U1) and interface (J1), the data of storage are passed to computing machine.

In the circuit of Fig. 2, also have electric battery (B1), it provides electric energy for entire circuit.7805 (D1) are the temperature and pressure circuit, because circuit needs stable voltage source, and battery can make voltage reduce because use, therefore need 7805 (D1) with voltage surely at 5V.C3～C8 is a filter capacitor in Fig. 2.What be made up of R8, R9, C9 and S1 is reset circuit.When circuit working is unsettled, can single-chip microcomputer be returned to normal condition by hand-reset.What be made up of S2～S5 and R10 is the function key circuit, can be by the function of each function key of programmed settings, to realize different purposes.

Fig. 3 is the interface frame of the internal processes of single-chip microcomputer 78E52 (U3), adopts the modular method to write, and other functions are all finished by each functional module except master routine.

Claims

1. digital clinical thermometer, can be to the whole digitizings of measurement, processing, demonstration and storage of temperature, it is characterized in that: utilize the temperature sensitivity of platinum resistance (R2) that temperature variation is converted to change in voltage, utilize modulus conversion chip ADC0804 (U2) that magnitude of voltage is sampled then, and be converted into digital quantity, and handle by single-chip microcomputer 78E52 (U3), and be stored among the EEPROM 24C08 (U5), show by display chip (U4) at last.

2. digital clinical thermometer according to claim 1 is characterized in that: have usb circuit CY7C63722 (U1) and (J1).