CN201575866U - Temperature collecting and recording device - Google Patents
Temperature collecting and recording device Download PDFInfo
- Publication number
- CN201575866U CN201575866U CN2009202052289U CN200920205228U CN201575866U CN 201575866 U CN201575866 U CN 201575866U CN 2009202052289 U CN2009202052289 U CN 2009202052289U CN 200920205228 U CN200920205228 U CN 200920205228U CN 201575866 U CN201575866 U CN 201575866U
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- microprocessor
- power supply
- pen recorder
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- 238000004891 communication Methods 0.000 claims abstract description 17
- 238000005538 encapsulation Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000003745 diagnosis Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The utility model discloses a temperature collecting and recording device. The device comprises a power supply unit, a temperature collection unit, a microprocessor unit, a record displaying unit and a communication interface unit, wherein the power supply unit is connected with a power source terminal of the microprocessor unit; the temperature collection unit and the record displaying unit are both connected with the microprocessor unit; and the communication interface unit adopting RS-232 and TTL/CMOS electrical level transfer circuits is also connected with the microprocessor unit. As the communication interface unit adopting the RS-232 and TTL/CMOS electrical level transfer circuits is added to a conventional temperature collecting and recording device, the temperature collecting and recording device provided by the utility model can conveniently communicate with a computer through the communication interface circuit, so as to not only input the collected data into the computer system for extremely convenient display and recording, but also receive system diagnosis and upgrading from the computer system through the communication interface.
Description
Technical field
The utility model relates to temperature collection and pen recorder, especially relates to a kind of device that can gather and write down the multipath environment temperature simultaneously that uses under automotive environment.
Background technology
At present, temperature collecting device, particularly employed temperature acquisition of road test and pen recorder in the automotive air-conditioning system performance history, there is not unified data input/output interface, can not be easily for this system upgrade software with the temperature data that collects is sent to other computing machine show and write down and all compare difficultly that total system also has shortcomings such as volume is small and exquisite inadequately, quality lays particular stress on, expense is higher.
Summary of the invention
The purpose of this utility model provides a kind of temperature acquisition and pen recorder with RS-232 interface, solving existing temperature acquisition and pen recorder does not have unified data input/output interface, can not be easily for this system upgrade software with the temperature data that collects is sent to other computing machine show and write down problems such as all comparing difficulty.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of temperature acquisition and pen recorder, comprise power supply unit, temperature collecting cell, microprocessor unit and displayed record unit, described power supply unit is connected with the power end of described microprocessor unit, and temperature collecting cell is connected with microprocessor unit respectively with the displayed record unit; In addition, also comprise communications interface unit, described communications interface unit is connected with described microprocessor unit, comprises RS-232 and TTL/CMOS level shifting circuit.
The beneficial effects of the utility model: owing in existing temperature acquisition and pen recorder, increased the communications interface unit of RS-232 and TTL/CMOS level shifting circuit, temperature acquisition of the present utility model and pen recorder can be communicated by this communication interface circuit and computing machine easily, the data of gathering are outputed to computer system, show and write down very conveniently by computer system, in addition also can the receiving computer system by this interface native system is diagnosed and upgraded.Overcome the shortcoming of existing temperature acquisition and pen recorder fully.
Below with reference to drawings and Examples, the utility model is carried out comparatively detailed explanation.
Description of drawings
Fig. 1 is temperature acquisition and recording device structure block diagram.
Fig. 2 is communications interface unit circuit theory diagrams in temperature acquisition and the pen recorder.
Fig. 3 is a power unit circuit schematic diagram in temperature acquisition and the pen recorder.
Fig. 4 is a temperature collection circuit element circuit schematic diagram in temperature acquisition and the pen recorder.
Embodiment
The MAX232 chip that present embodiment adopts is that U.S. letter company is the interface circuit of the rs-232 standard serial ports design of computer, use+5v single power supply specially.
Inner structure can be divided three parts substantially:
First is a charge pump circuit.Constitute by 1,2,3,4,5,6 pin and 4 electric capacity such as C3, C4, C5 and C6.Function be generation+12v and-two power supplys of 12v, offer the needs of RS-232 serial ports level.
Second portion is the data-switching passage.Constitute two data passages by 7,8,9,10,11,12,13,14 pin.Present embodiment has only used first data channel.
Wherein 13 pin (R1IN), 12 pin (R1OUT), 11 pin (T1IN), 14 pin (T1OUT) are first data channel.
8 pin (R2IN), 9 pin (R2OUT), 10 pin (T2IN), 7 pin (T2OUT) are second data channel.These 4 pins are vacant in the present embodiment.
The TTL/CMOS data convert the RS-232 data to from the input of 11 pin and deliver to computer DB9 plug from 14 pin; The RS-232 data of DB9 plug are exported from 12 pin after the input of 13 pin converts the TTL/CMOS data to.
Third part is power supply.15 pin GND, 16 pin VCC (+5v).
Level transferring chip U1 in the present embodiment in the communications interface unit circuit realizes the conversion of RS232 level to the TTL/CMOS level under the help of capacitor C3-C6.Microprocessor U4 is after obtaining the order that host computer (personal computer PC) end assigns by the serial ports of self, the data that collect are passed through this serial ports, baud rate with 1200bps, be sent to PC, the software of the last operation of PC from then on serial ports obtains the multi way temperature data, and conversion, is presented at respectively on the screen of described PC, and be recorded as the form of EXCEL book on the backstage, stamp automatically simultaneously and gather date and time as file.Show and store with a PC, use the data will be very convenient, can design various very personalized display interfaces.In addition in this system when for the first time making or producing, operate in the program of microprocessor internal, can be by the serial ports of PC, under the effect of described level transferring chip U1, by the ISP program that U4 producer provides, programming (download) is in described microprocessor.In the present embodiment, window application is to operate in 32 programs that communicate with acquisition system on the PC, and this software adopts Visual Basic language compilation to form, and is responsible for graphical demonstration of Data Dynamic and backstage record.
In the present embodiment, power supply unit mainly be for the power supply of 6-24V stable be controlled at 5V so that the electric energy that directly utilizes the car load accumulator to provide works for a long time, simultaneously, stable 5V output guarantees that microprocessor unit and other power unit are in optimum Working.Its main body is U2 unit chip 78L05.Described as can be known by the front, in the present embodiment, the power supply of power supply unit is an accumulator, comprises the circuit of three-terminal voltage-stabilizing integrated chip, and circuit of three-terminal voltage-stabilizing integrated chip model is 78L05.Here first pin of 78L05 connects described battery positive voltage, the 3rd pin ground connection, the second pin output+5V stabilized power source, as shown in Figure 3: when the power output end of accumulator by the anti-reverse of D1 and voltage stabilizing output action at 78L05 under, through E1 filtering and switch S 9 conductings, to the total system power supply, simultaneously, under the effect of R16 current-limiting resistance, the luminous indicating circuit of LED D3 begins power supply.After power supply offers microprocessor STC12C5410AD, under the charging effect of the reset circuit that it is attached, produce a high level greater than 4uS at the RST of STC12C5410AD pin, after successfully resetting, microprocessor STC12C5410AD formally starts working.If press reset switch S8, also can produce once resetting of success, simultaneously, pulse-generating circuit provides the stable clock pulse for microprocessor STC12C5410AD.
In the present embodiment: temperature collecting cell comprises fixing inclined to one side value cell and integrated temperature sensing unit; The fixing inclined to one side value cell of present embodiment adopts and divides piezoelectricity and selected the STC12C5410AD chip for use, and integrated A/D conversion reduces system cost; Also can adopt the integrated digital temperature sensor as temperature collecting cell, this integrated digital temperature sensor has self-calibration function, inside carries oscillator, counter, arithmetical unit, storer, can be used as calibration reference simultaneously, it is a kind of digital temperature collecting unit of intelligence, but all adopt the integrated digital temperature sensor will make cost higher, for a bit, present embodiment adopts fixing inclined to one side value cell and integrated temperature sensor to combine.
Fixing inclined to one side value cell comprises one group of fixed value resistance and thermistor, one group of 8 fixed value resistance and 8 thermistors are arranged here, the output of one end of each fixed value resistance and power supply unit+the 5V stable power links to each other, the other end adopts negative temperature coefficient thermis (NTC) by thermistor ground connection in the present embodiment.One signal lead is set between fixed value resistance and NTC connects that 8 A/D unit input ends of microprocessor link to each other in the described microprocessor unit; In the present embodiment, fixed value resistance that we select for use and thermistor resistance when normal temperature is basic identical.When at normal temperature, output 2.5V.As shown in Figure 4, in the present embodiment, the resistance R 21-R28 of fixed bias circuit and NTC resistance R T0-RT7 have constituted 8 bleeder circuits, the P1.0-P1.7 pin of transferring to microprocessor STC12C5410AD chip through the voltage after partial signal carries out the A/D conversion, thereby converses the temperature value at thermistor place.A/D translation function that microprocessor STC12C5410AD is integrated is selected this chip for use, has reduced the cost of this system.
In the present embodiment, temperature acquisition system comprises that also an integrated temperature sensing unit comprises digital temperature sensor, its model is DS18B20, and the digital output end of this digital temperature sensor is connected with the 17th pin of microprocessor STC12C5410AD chip in the microprocessor unit.The integrated form temperature sensor DS18B20 at this place has self-calibration function, this chip internal carries oscillator, counter, arithmetical unit, storer and level treatment circuit, nominal accuracy is 0.5 ℃, resolution is 0.06 ℃, communicate by pin DQ one wire protocol and microprocessor, and transmission pure digi-tal signal, antijamming capability is quite strong.In most of the cases, this integrated temperature sensor avoids calibration or demarcates.
In the present embodiment, display unit is made up of the S8550 triode and the current-limiting resistance of four TO-92B encapsulation, has constituted dynamic scan display circuit commonly used in the industry with microprocessor unit.
The temperature signal that eight road NTC thermistors of present embodiment collect and the signal of integrated digital temperature sensor are independent of each other, can carry out simultaneously, so be nine road temperature acquisitions, are called nine channel temperature collection and pen recorders.
Claims (8)
1. temperature acquisition and pen recorder, comprise power supply unit, temperature collecting cell, microprocessor unit and displayed record unit, described power supply unit is connected with the power end of described microprocessor unit, and temperature collecting cell is connected with microprocessor unit respectively with the displayed record unit; It is characterized in that, also comprise communications interface unit, described communications interface unit is connected with described microprocessor unit, comprises RS-232 and TTL/CMOS level shifting circuit.
2. temperature acquisition according to claim 1 and pen recorder is characterized in that: described microprocessor unit comprises microprocessor, and the microprocessor model is STC12C5410AD.
3. temperature acquisition according to claim 2 and pen recorder is characterized in that: described communications interface unit comprises as the MAX232 chip of RS-232 Linear Driving receiver and peripheral electric capacity.
4. temperature acquisition according to claim 1 and pen recorder, it is characterized in that: the power supply of described power supply unit is an accumulator, comprise the circuit of three-terminal voltage-stabilizing integrated chip, described circuit of three-terminal voltage-stabilizing integrated chip model is 78L05, first pin of described circuit of three-terminal voltage-stabilizing integrated chip connects described battery positive voltage, the 3rd pin ground connection, the second pin output+5V stabilized power source.
5. temperature acquisition according to claim 2 and pen recorder is characterized in that: described temperature collecting cell comprises fixing inclined to one side value cell and integrated temperature sensing unit;
Described fixing inclined to one side value cell comprises one group of fixed value resistance and thermistor, described fixed value resistance one end links to each other with described power supply unit output, the described thermistor of one termination, the other end ground connection of thermistor is provided with a signal lead and connects described microprocessor unit between described fixed value resistance and thermistor;
Described integrated temperature sensing unit comprises digital temperature sensor, and the model of digital temperature sensor is DS18B20, and the digital output end of this digital temperature sensor is connected with microprocessor unit.
6. temperature acquisition according to claim 5 and pen recorder is characterized in that: described fixed value resistance and described thermistor resistance when normal temperature is identical.
7. according to claim 5 or 6 described temperature acquisition and pen recorders, it is characterized in that: described fixed value resistance and thermistor are 8 pairs, and 8 output signals link to each other with 8 A/D unit input ends of microprocessor unit respectively.
8. temperature acquisition according to claim 7 and pen recorder is characterized in that: the S8550 triode that comprises four TO-92B encapsulation in the described displayed record unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202052289U CN201575866U (en) | 2009-09-29 | 2009-09-29 | Temperature collecting and recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202052289U CN201575866U (en) | 2009-09-29 | 2009-09-29 | Temperature collecting and recording device |
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| Publication Number | Publication Date |
|---|---|
| CN201575866U true CN201575866U (en) | 2010-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009202052289U Expired - Lifetime CN201575866U (en) | 2009-09-29 | 2009-09-29 | Temperature collecting and recording device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393221A (en) * | 2011-10-24 | 2012-03-28 | 中国人民解放军总装备部军械技术研究所 | Automatic monitoring system for humiture of warehouse |
| CN102879112A (en) * | 2012-09-22 | 2013-01-16 | 华晶精密制造有限公司 | Dedicated temperature monitoring and recording system for diamond fretsaw |
| CN104515615A (en) * | 2013-09-27 | 2015-04-15 | 北汽福田汽车股份有限公司 | Temperature acquisition system used for vehicle and vehicle with same |
-
2009
- 2009-09-29 CN CN2009202052289U patent/CN201575866U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393221A (en) * | 2011-10-24 | 2012-03-28 | 中国人民解放军总装备部军械技术研究所 | Automatic monitoring system for humiture of warehouse |
| CN102879112A (en) * | 2012-09-22 | 2013-01-16 | 华晶精密制造有限公司 | Dedicated temperature monitoring and recording system for diamond fretsaw |
| CN102879112B (en) * | 2012-09-22 | 2014-11-05 | 华晶精密制造有限公司 | Dedicated temperature monitoring and recording system for diamond fretsaw |
| CN104515615A (en) * | 2013-09-27 | 2015-04-15 | 北汽福田汽车股份有限公司 | Temperature acquisition system used for vehicle and vehicle with same |
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| C14 | Grant of patent or utility model | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20100908 |
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| CX01 | Expiry of patent term |