CN105318981A - Novel temperature measurement circuit - Google Patents
Novel temperature measurement circuit Download PDFInfo
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- CN105318981A CN105318981A CN201510768915.1A CN201510768915A CN105318981A CN 105318981 A CN105318981 A CN 105318981A CN 201510768915 A CN201510768915 A CN 201510768915A CN 105318981 A CN105318981 A CN 105318981A
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- chip microcomputer
- resistance
- resistor
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Abstract
The invention discloses a novel temperature measurement circuit, comprising a power supply VCC, a resistor R1, a resistor R2, a light emitting triode Q, a capacitor C, a display and an AT89C2051 single-chip microcomputer with a built-in comparator. The resistor R1, the resistor R2, the display and the AT89C2051 single-chip microcomputer are all in connection with the power supply VCC; the resistor R2 is in connection with the P1.0 port of the AT89C2051 single-chip microcomputer; one terminal of the capacitor C is in connection with the resistor R2, and the other terminal is grounding; the base electrode of the light emitting triode Q is in simultaneous connection with the P1.1 port of the AT89C2051 single-chip microcomputer and the resistor R1, the collector electrode is in connection with the resistor R1, and the emitter is grounding; the display is in connection with the AT89C2051 single-chip microcomputer. The novel temperature measurement circuit has the characteristics of low cost, high procession, simplicity and reliability, and is suitable for measuring occasions at low temperatures.
Description
Technical field
The present invention relates to a kind of metering circuit, what be specifically related to is a kind of novel temperature measurement circuit.
Background technology
In many products, all need to measure its temperature, and in most cases, the collection of temperature is completed by temperature measuring equipment (such as temperature sensor) mostly.
Adopt temperature sensor collecting temperature, although can realize the measurement of temperature, for the occasion that 0 ~ 100 DEG C of measurement range is little, temperature sensor circuit is comparatively complicated, and power consumption is higher, can increase the input of cost.
Summary of the invention
For the deficiency of above-mentioned technology, the invention provides a kind of novel temperature measurement circuit, there is low cost, high precision, simple and reliable feature, be applicable to the occasion that measuring tempeature is not high.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind of novel temperature measurement circuit, comprises power supply VCC, resistance R1, resistance R2, light emitting transistor Q, electric capacity C, display and is built-in with the AT89C2051 single-chip microcomputer of comparer; Described resistance R1, resistance R2, display are all connected power supply VCC with AT89C2051 single-chip microcomputer; Described resistance R2 connects AT89C2051 single-chip microcomputer P1.0 port, described electric capacity C mono-terminating resistor R2, other end ground connection; Described triode Q base stage connects AT89C2051 single-chip microcomputer P1.1 port and resistance R1 simultaneously, collector connecting resistance R1, grounded emitter; Described display is connected with AT89C2051 single-chip microcomputer.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention does not adopt temperature sensor and high-precision A/D converter to carry out temperature survey, but utilize triode temperature characterisitic and RC integral characteristic, by the process of AT89C2051 single-chip microcomputer, obtain the corresponding relation in triode temperature and RC duration of charging, the measurement of temperature is become the measurement of time, thus obtain temperature data, thus, just can reduce power consumption well, and decrease the input of cost.The present invention is suitable for the not high occasion of measuring tempeature very much.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
As shown in Figure 1, the present invention includes power supply VCC, resistance R1, resistance R2, light emitting transistor Q, electric capacity C, display and be built-in with the AT89C2051 single-chip microcomputer of comparer; Described resistance R1, resistance R2, display are all connected power supply VCC with AT89C2051 single-chip microcomputer; Described resistance R2 connects AT89C2051 single-chip microcomputer P1.0 port, described electric capacity C mono-terminating resistor R2, other end ground connection; Described triode Q base stage connects AT89C2051 single-chip microcomputer P1.1 port and resistance R1 simultaneously, collector connecting resistance R1, grounded emitter; Described display is connected with AT89C2051 single-chip microcomputer.
The present invention adopts triode Q as temperature element, and the temperature-voltage characteristic utilizing its pn to tie records the change of temperature, then temperature voltage signal and resistance R2 and electric capacity C integrated signal is delivered to the comparator input terminal of AT89C2051 single-chip microcomputer.In AT89C2051 single-chip microcomputer, the input port of comparer is P1.0 and P1.1, and wherein P1.0 is in-phase input end, and P1.1 is inverting input, and output terminal is P3.6.P1.0 is the input end of comparer, and simultaneously or the output port of single-chip microcomputer, it has the character of one-chip machine port, that is:, when P1.0 exports high level, be equivalent to inner open collector state.At this, utilize the control of this functional realiey capacitor charge and discharge, not during measuring tempeature, P1.0 output low level, electric capacity both end voltage is 0V.During measuring tempeature, first start T0 counter, then P1.0 is set high level, charge via resistance R2, resistance R1 to electric capacity C, meanwhile, single-chip microcomputer judges the state of P3.6 continuously.When the voltage of P1.0 is greater than the voltage of P1.1, comparator output terminal P3.6 overturns, and in the duration of charging before single chip computer measurement upset, obtains time value, then just can obtain the temperature value measured, then be shown by display.
According to above-described embodiment, just the present invention can be realized preferably.
Claims (1)
1. a novel temperature measurement circuit, is characterized in that: comprise power supply VCC, resistance R1, resistance R2, light emitting transistor Q, electric capacity C, display and be built-in with the AT89C2051 single-chip microcomputer of comparer; Described resistance R1, resistance R2, display are all connected power supply VCC with AT89C2051 single-chip microcomputer; Described resistance R2 connects AT89C2051 single-chip microcomputer P1.0 port, described electric capacity C mono-terminating resistor R2, other end ground connection; Described triode Q base stage connects AT89C2051 single-chip microcomputer P1.1 port and resistance R1 simultaneously, collector connecting resistance R1, grounded emitter; Described display is connected with AT89C2051 single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510768915.1A CN105318981A (en) | 2015-11-12 | 2015-11-12 | Novel temperature measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510768915.1A CN105318981A (en) | 2015-11-12 | 2015-11-12 | Novel temperature measurement circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105318981A true CN105318981A (en) | 2016-02-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510768915.1A Pending CN105318981A (en) | 2015-11-12 | 2015-11-12 | Novel temperature measurement circuit |
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| CN (1) | CN105318981A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108839242A (en) * | 2018-07-10 | 2018-11-20 | 四川双利新材料有限公司 | It can effectively real-time warm survey type cement mixing equipment |
| CN108994919A (en) * | 2018-07-13 | 2018-12-14 | 成都信息工程大学 | Based on microprocessor automatic control type intelligence medicine materical crude slice process equipment |
| CN109031051A (en) * | 2018-09-21 | 2018-12-18 | 四川师范大学 | A kind of low-voltage electrical line fault electric arc monitoring systems |
| CN110779311A (en) * | 2018-07-30 | 2020-02-11 | 成都本润农业科技有限公司 | Agricultural intelligent baking equipment based on accurate temperature side of singlechip |
| CN110779312A (en) * | 2018-07-30 | 2020-02-11 | 成都本润农业科技有限公司 | Agricultural equipment of toasting of accurate control by temperature change formula |
| CN110806087A (en) * | 2018-08-06 | 2020-02-18 | 成都本润农业科技有限公司 | Intelligent agricultural dryer |
-
2015
- 2015-11-12 CN CN201510768915.1A patent/CN105318981A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108839242A (en) * | 2018-07-10 | 2018-11-20 | 四川双利新材料有限公司 | It can effectively real-time warm survey type cement mixing equipment |
| CN108994919A (en) * | 2018-07-13 | 2018-12-14 | 成都信息工程大学 | Based on microprocessor automatic control type intelligence medicine materical crude slice process equipment |
| CN110779311A (en) * | 2018-07-30 | 2020-02-11 | 成都本润农业科技有限公司 | Agricultural intelligent baking equipment based on accurate temperature side of singlechip |
| CN110779312A (en) * | 2018-07-30 | 2020-02-11 | 成都本润农业科技有限公司 | Agricultural equipment of toasting of accurate control by temperature change formula |
| CN110806087A (en) * | 2018-08-06 | 2020-02-18 | 成都本润农业科技有限公司 | Intelligent agricultural dryer |
| CN109031051A (en) * | 2018-09-21 | 2018-12-18 | 四川师范大学 | A kind of low-voltage electrical line fault electric arc monitoring systems |
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Legal Events
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| C06 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160210 |
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| WD01 | Invention patent application deemed withdrawn after publication |