CN105387949A - Temperature measurement system based on STC single-chip microcomputer - Google Patents
Temperature measurement system based on STC single-chip microcomputer Download PDFInfo
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- CN105387949A CN105387949A CN201410444936.3A CN201410444936A CN105387949A CN 105387949 A CN105387949 A CN 105387949A CN 201410444936 A CN201410444936 A CN 201410444936A CN 105387949 A CN105387949 A CN 105387949A
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Abstract
The invention discloses a temperature measurement system based on an STC single-chip microcomputer. The system can iron out the defects of poor temperature measurement linearity, sensitivity and anti-vibration performances and smaller measurement range. Moreover, the system is higher in precision, and is convenient and practical. The system comprises a temperature sensor, a signal conditioning circuit, an STC single-chip microcomputer calculation conversion module, and a temperature display module. The structural main points of the system are that the signal processing circuit consists of a single filtering circuit and a single amplification circuit; the STC single-chip microcomputer serves as the core of the system; the analog-digital conversion of a PT1000 temperature sensor signal after the filtering and amplifying of the filtering circuit and the amplification circuit is carried out through an in-chip 10-bit A/D conversion module; temperature is calculated through employing a Newton iteration method, and a liquid crystal display module is controlled to visually display the value of the temperature; meanwhile, the exterior of the STC single-chip microcomputer is provided with a power supply, a clock, and a reset circuit.
Description
Technical field
The present invention is applied in the fields such as precision chemical, biological medicine, fine chemistry industry, exact instrument, relates to a kind of temperature measurement system based on STC single-chip microcomputer particularly.
Background technology
Along with the development of science and technology, the requirements of field to temperature control precision such as precision chemical, biological medicine, fine chemistry industry, exact instrument are high, and the temperature survey just of temperature controlled core.
At present at home, most widely used temp measuring method has thermocouple temperature measurement, integrated form temperature sensor, thermistor temperature detecting, platinum resistance thermometer sensor, thermometric four kinds of methods.
(1) temperature measurement range of thermopair is comparatively wide, and structure is simple, but its electromotive force is little, and sensitivity is poor, and error is comparatively large, must add cold junction compensation, use inconvenience during actual use.
(2) integrated form temperature sensor is the temperature sensor of a new generation, has that volume is little, lightweight, the linearity is good, steady performance, is suitable for telemeasurement and transmission.But because price is comparatively expensive, the application of field of temperature measurement is not also very extensive at home.
(3) thermistor has the advantages such as highly sensitive, low in energy consumption, cheap, but its resistance becomes nonlinear relationship with temperature variation, the occasion higher in measuring accuracy must carry out Nonlinear Processing, make troubles to calculating, stability and the interchangeability of this external component are poor, thus make its range of application less.
(4) platinum resistance thermometer sensor, has the advantages such as output potential is large, the linearity good, highly sensitive, resistance to shock is good.Although its price is higher relative to thermistor, its integrated performance index is best really.And stability is better, therefore it is wider in industrial field of temperature measurement application.
Summary of the invention
The present invention is exactly for the problems referred to above, makes up the deficiencies in the prior art, provides a kind of temperature measurement system based on STC single-chip microcomputer, and the present invention can solve that temperature survey is linearly spent, sensitivity, shock resistance are poor, the deficiency that measurement range is less; And precision is higher, convenient and practical.
For realizing above-mentioned purpose of the present invention, the present invention adopts following technical scheme.
A kind of temperature measurement system based on STC single-chip microcomputer of the present invention, calculates modular converter, temperature display module comprising temperature sensor, signal conditioning circuit, STC single-chip microcomputer; Its structural feature is: signal conditioning circuit is made up of signal filter circuit and signal amplification circuit, STC single-chip microcomputer is as the core of this temperature measurement system, gather and carry out the PT1000 temperature sensor signal after filtering and amplification process through filtering circuit and amplifying circuit, and by 10 A/D modular converters in its sheet, analog to digital conversion is carried out to signal; Adopt Newton iteration method to be calculated as temperature, and control LCD MODULE and demonstrate Temperature numerical intuitively; STC single-chip microcomputer outer setting power supply, clock and reset circuit simultaneously.
As a preferred embodiment of the present invention, described temperature sensor adopts PT1000 temperature sensor, the resistance of PT1000 platinum resistance thermometer sensor, has the characteristic changed along with the change of temperature, so can carry out indirect inspection temperature by the method for indirect inspection platinum resistance thermometer sensor, resistance; Platinum resistance thermometer sensor, has the advantages such as output potential is large, the linearity good, highly sensitive, interchangeability is good in addition, is suitable as temperature sensor of the present invention.
As another kind of preferred version of the present invention, the A/D analog to digital converter that described STC single-chip microcomputer calculates modular converter adopts 10 A/D converters carried in STC Single Chip Microcomputer (SCM) system sheet, it has 10 conversion accuracies, sample rate is fast, sample frequency can reach 300KHz, built-in sampling hold circuit, is configured with 8 road external channels, can does temperature detection, voltage detecting, frequency spectrum detection etc.
As another preferred version of the present invention, described temperature display module SMC1602A LCD MODULE coordinates STC single-chip microcomputer to realize, SMC1602A is standard character dot matrix type LCD MODULE, adopt dot matrix type liquid crystal display (LCD), 16 character × 2 row western language characters can be shown, character size is 2.95 × 4.35 (WXH) mm, built-in HD44780 interface type liquid crystal display controller.
The invention has the beneficial effects as follows.
The present invention adopts Pt1000 temperature sensor, realizes thermometric scheme by indirect inspection platinum resistance thermometer sensor, resistance; With the principle of platinum resistance thermometer sensor, measuring tempeature, then based on the measurement of STC chip microcontroller platinum resistance thermometer sensor, resistance, adopt Newton iteration method accounting temperature.Measuring accuracy of the present invention is high, good linearity, has stronger real-time and reliability, has certain construction value; Solve the problem that the existing thermometry linearity, sensitivity, shock resistance are poor, and there is the advantages such as the directly perceived and structural module of reliable operation, operation, there is the application prospect of certain engineering.
Accompanying drawing explanation
Fig. 1 is a kind of temperature measurement system structured flowchart based on STC single-chip microcomputer of the present invention.
Fig. 2 is the main program flow chart of a kind of temperature measurement system based on STC single-chip microcomputer of the present invention.
Fig. 3 is the processes temperature signal process flow diagram of a kind of temperature measurement system based on STC single-chip microcomputer of the present invention.
Embodiment
As shown in Figure 1, be a kind of temperature measurement system structured flowchart based on STC single-chip microcomputer of the present invention.Figure comprises temperature sensor, signal conditioning circuit, the calculating of STC single-chip microcomputer modular converter, temperature display module; Signal conditioning circuit is made up of signal filter circuit and signal amplification circuit, STC single-chip microcomputer is as the core of this temperature measurement system, gather and carry out the PT1000 temperature sensor signal after filtering and amplification process through filtering circuit and amplifying circuit, and by 10 A/D modular converters in its sheet, analog to digital conversion is carried out to signal; Adopt Newton iteration method to be calculated as temperature, and control LCD MODULE and demonstrate Temperature numerical intuitively; STC single-chip microcomputer outer setting power supply, clock and reset circuit simultaneously.
As shown in Fig. 2 embodiment, it is the main program flow chart of a kind of temperature measurement system based on STC single-chip microcomputer of the present invention.Master routine, after completion system initialization, enters standby mode; When there being processes temperature signal to interrupt, program jumps out standby mode, enters processes temperature signal program, after executing this interrupt routine, comes back to standby mode.
As illustrated in the embodiment of figure 3, be the processes temperature signal process flow diagram of a kind of temperature measurement system based on STC single-chip microcomputer of the present invention.After system program enters processes temperature signal program, open ADC10 converter and carry out analog to digital conversion, and data are processed and calculates; For making temperature data more accurate, multiple repairing weld and A/D conversion need be carried out, and adopt digital filtering algorithm to carry out digital filtering.
Claims (4)
1., based on a temperature measurement system for STC single-chip microcomputer, calculate modular converter, temperature display module comprising temperature sensor, signal conditioning circuit, STC single-chip microcomputer; It is characterized in that: signal conditioning circuit is made up of signal filter circuit and signal amplification circuit, STC single-chip microcomputer is as the core of this temperature measurement system, gather and carry out the PT1000 temperature sensor signal after filtering and amplification process through filtering circuit and amplifying circuit, and by 10 A/D modular converters in its sheet, analog to digital conversion is carried out to signal; Adopt Newton iteration method to be calculated as temperature, and control LCD MODULE and demonstrate Temperature numerical intuitively; STC single-chip microcomputer outer setting power supply, clock and reset circuit simultaneously.
2. a kind of temperature measurement system based on STC single-chip microcomputer according to claim 1, it is characterized in that: described temperature sensor adopts PT1000 temperature sensor, the resistance of PT1000 platinum resistance thermometer sensor, has the characteristic changed along with the change of temperature, carrys out indirect inspection temperature by indirect inspection platinum resistance thermometer sensor, resistance.
3. a kind of temperature measurement system based on STC single-chip microcomputer according to claim 1, it is characterized in that: the A/D analog to digital converter that described STC single-chip microcomputer calculates modular converter adopts 10 A/D converters carried in STC Single Chip Microcomputer (SCM) system sheet, it has 10 conversion accuracies, sample rate is fast, sample frequency can reach 300KHz, built-in sampling hold circuit, is configured with 8 road external channels.
4. a kind of temperature measurement system based on STC single-chip microcomputer according to claim 1, it is characterized in that: described temperature display module SMC1602A LCD MODULE coordinates STC single-chip microcomputer to realize, SMC1602A is standard character dot matrix type LCD MODULE, adopt dot matrix type liquid crystal display (LCD), 16 character × 2 row western language characters can be shown, character size is 2.95 × 4.35 (WXH) mm, built-in HD44780 interface type liquid crystal display controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410444936.3A CN105387949A (en) | 2014-09-03 | 2014-09-03 | Temperature measurement system based on STC single-chip microcomputer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410444936.3A CN105387949A (en) | 2014-09-03 | 2014-09-03 | Temperature measurement system based on STC single-chip microcomputer |
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| CN105387949A true CN105387949A (en) | 2016-03-09 |
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| CN201410444936.3A Pending CN105387949A (en) | 2014-09-03 | 2014-09-03 | Temperature measurement system based on STC single-chip microcomputer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114237145A (en) * | 2021-11-22 | 2022-03-25 | 浙江华章科技有限公司 | Gear box temperature and vibration analysis and maintenance system |
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2014
- 2014-09-03 CN CN201410444936.3A patent/CN105387949A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114237145A (en) * | 2021-11-22 | 2022-03-25 | 浙江华章科技有限公司 | Gear box temperature and vibration analysis and maintenance system |
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Application publication date: 20160309 |
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| WD01 | Invention patent application deemed withdrawn after publication |