CN102118472A - Mobile phone thermometer and circuit for realizing temperature measurement by using mobile phone - Google Patents
Mobile phone thermometer and circuit for realizing temperature measurement by using mobile phone Download PDFInfo
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- CN102118472A CN102118472A CN2010105943314A CN201010594331A CN102118472A CN 102118472 A CN102118472 A CN 102118472A CN 2010105943314 A CN2010105943314 A CN 2010105943314A CN 201010594331 A CN201010594331 A CN 201010594331A CN 102118472 A CN102118472 A CN 102118472A
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- 238000009529 body temperature measurement Methods 0.000 title abstract description 3
- 239000000523 sample Substances 0.000 claims description 20
- 238000013507 mapping Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000005538 encapsulation Methods 0.000 claims description 5
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- 238000001514 detection method Methods 0.000 description 1
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- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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Abstract
The invention discloses a mobile phone thermometer and a circuit for realizing temperature measurement by using a mobile phone. The circuit comprises a mobile phone side circuit and an external temperature sensing circuit. The mobile phone side circuit comprises a main control chip (MCU) and a USB (Universal Serial Bus) interface electrically connected with the MCU, wherein an ID (Identification) pin of the USB interface is connected with an analog to digital converter input pin ADC_TEMP of the MCU, the analog to digital converter input pin ADC_TEMP is connected with the first end of a divider resistor R1 in parallel, and the second end of the divider resistor R1 is connected with a voltage source AVDD. The external temperature sensing circuit comprises a thermistor NTC (Negative Temperature Coefficient) and a USB socket electrically connected with the thermistor NTC, the ID pin of the USB socket is connected with the first end of the thermistor NTC, and the second end of the thermistor NTC is grounded, wherein the USB socket and the USB interface can be connected in a pluggable mode, and the analog to digital converter input pin ADC_TEMP can know external temperature according to the level of the thermistor NTC. The mobile phone thermometer provides convenience for users to accurately measure environment or hot water temperature and the like when necessary, has low cost and is convenient and practical.
Description
[technical field]
The present invention relates to temperature measurement technology, particularly a kind of mobile phone that utilizes is realized thermometric circuit and a kind of mobile phone temp meter thereof.
[background technology]
Along with the raising day by day of living standard, mobile phone has become one of people's daily life, work necessary tool.Mobile phone except possessing major functions such as conversation, data communication, also possesses multiple miscellaneous function as information terminal, and for example clock, torch, mp3, photograph etc. have brought facility for people's life.
NTC thermistor (Negative Temperature Coefficient, negative temperature coefficient thermistor) has the temperature variant characteristic of impedance, so generally uses the NTC device to detect battery temperature, detection crystal oscillator temperature in the mobile phone.Utilize the NTC thermistor can make mobile phone become a kind of temperature-detecting device, but owing to be built in the influence that NTC device in the mobile phone can be subjected to mobile phone internal work environment, can not be accurately and detect ambient temperature easily.
[summary of the invention]
Technical problem to be solved by this invention provides a kind of mobile phone that utilizes and realizes thermometric circuit and a kind of mobile phone temp meter thereof, to improve the problem that mobile phone in the prior art can not accurately and easily detect ambient temperature.
The present invention solves the problems of the technologies described above and the technical scheme taked provides a kind of mobile phone that utilizes realizes thermometric circuit, comprising:
The mobile phone terminal circuit, comprise main control chip MCU and the USB interface that is electrically connected with main control chip MCU, wherein, main control chip MCU has analog to digital converter input pin ADC_TEMP, the ID pin of USB interface is connected to analog to digital converter input pin ADC_TEMP, and analog to digital converter input pin ADC_TEMP also connects first end of divider resistance R1, and second end of divider resistance R1 connects voltage source AVDD;
The external temperature sensing circuit comprises thermistor NTC and the USB socket that is electrically connected with thermistor NTC, and the ID pin of USB socket connects first end of thermistor NTC, the second end ground connection of thermistor NTC;
Wherein, the USB socket can be connected with USB interface with plugging, and analog to digital converter input pin ADC_TEMP learns external temperature according to the level on the thermistor NTC.
According to one preferred embodiment of the present invention, store the voltage temperature mapping table among the main control chip MCU, analog to digital converter input pin ADC_TEMP carries out analog-to-digital conversion to the level on the thermistor NTC and obtains a corresponding voltage value, inquires about the display screen that draws corresponding temperature and pass through mobile phone according to corresponding voltage value in the voltage temperature mapping table and shows.
According to one preferred embodiment of the present invention, analog to digital converter input pin ADC_TEMP carries out analog-to-digital conversion at interval and inquires about with the real-time update external temperature in the voltage temperature mapping table at preset time.
According to one preferred embodiment of the present invention, thermistor NTC is located in the external temp probe.
According to one preferred embodiment of the present invention, the external temp probe is provided with the waterproof encapsulation.
The present invention solves the problems of the technologies described above and the technical scheme taked provides a kind of mobile phone temp meter, comprising:
Mobile phone, mobile phone comprises main control chip MCU and the USB interface that is electrically connected with main control chip MCU, wherein, main control chip MCU has analog to digital converter input pin ADC_TEMP, the ID pin of USB interface is connected to analog to digital converter input pin ADC_TEMP, and analog to digital converter input pin ADC_TEMP also connects first end of divider resistance R1, and second end of divider resistance R1 connects voltage source AVDD;
The external temp probe, the external temp probe comprises thermistor NTC and the USB socket that is electrically connected with thermistor NTC, wherein, USB socket ID pin connects first end of thermistor NTC, the second end ground connection of thermistor NTC;
Wherein, the USB socket can be connected with USB interface with plugging, and analog to digital converter input pin ADC_TEMP learns external temperature according to the level on the thermistor NTC.
According to one preferred embodiment of the present invention, store the voltage temperature mapping table among the main control chip MCU, analog to digital converter input pin ADC_TEMP carries out analog-to-digital conversion to the level on the thermistor NTC and obtains a corresponding voltage value, inquires about the display screen that draws corresponding temperature and pass through mobile phone according to corresponding voltage value in the voltage temperature mapping table and shows.
According to one preferred embodiment of the present invention, analog to digital converter input pin ADC_TEMP carries out analog-to-digital conversion at interval and inquires about with the real-time update external temperature in the voltage temperature mapping table at preset time.
According to one preferred embodiment of the present invention, the external temp probe adopts thermal conductive metallic material to make.
According to one preferred embodiment of the present invention, the external temp probe is provided with the waterproof encapsulation.
Compared with prior art, the mobile phone that utilizes provided by the invention realizes that thermometric circuit and mobile phone temp meter have effectively improved in the prior art the accurately problem of measures ambient temperature that the NTC thermistor is built in the mobile phone, and the present invention utilizes the external temp probe, be convenient to external environment condition is carried out temperature survey, it is with low cost, and is convenient and practical.
[description of drawings]
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.Wherein:
Fig. 1 has shown mobile phone terminal circuit figure according to one preferred embodiment of the present invention; And
Fig. 2 has shown the circuit diagram of external temperature sensing circuit according to one preferred embodiment of the present invention.
[embodiment]
The present invention is described in detail below in conjunction with drawings and Examples.
See also Fig. 1, Fig. 1 has shown mobile phone terminal circuit figure according to a preferred embodiment of the invention.
The mobile phone terminal circuit that present embodiment provides comprises main control chip MCU 10, the USB interface 20 that is electrically connected with main control chip MCU 10 and the voltage source AVDD that is electrically connected with main control chip MCU and USB interface.
Wherein, main control chip MCU 10 has analog to digital converter input pin ADC_TEMP, the ID pin of USB interface 20 is connected to analog to digital converter input pin ADC_TEMP, and analog to digital converter input pin ADC_TEMP also connects first end of divider resistance R1, second end of divider resistance R1 connects voltage source AVDD, in the present embodiment, divider resistance R1 selects 10K ohm for use.
Please in the lump referring to Fig. 2, Fig. 2 has shown the circuit diagram of external temperature sensing circuit according to one preferred embodiment of the present invention.
The external temperature sensing circuit that present embodiment provides comprises thermistor NTC 40 and the USB socket 30 that is electrically connected with thermistor NTC 40.Wherein, the ID pin of USB socket 30 connects first end of thermistor NTC 40, the second end ground connection of thermistor NTC 40.
In embodiments of the present invention, USB socket 30 can be connected with USB interface 20 with plugging.
Particularly, USB socket 30 has unsettled ID pin, this unsettled ID pin is connected to analog to digital converter input pin ADC_TEMP, the mobile phone terminal circuit utilizes the insertion identification pin of unsettled ID pin as identification external temperature sensing circuit, promptly when the USB socket inserts USB interface, unsettled ID pin becomes low level by high level, and when the USB socket was extracted USB interface, unsettled ID pin became high level by low level.When the USB socket inserted USB interface, voltage source AVDD provided operating voltage for the external temperature sensing circuit.
In embodiments of the present invention, USB socket 30 is with after USB interface 20 is connected, level on the ID pin is the dividing potential drop on the thermistor NTC 40, owing to have one-to-one relationship between the resistance of thermistor NTC 40 and the temperature, according to voltage divider principle, the branch voltage level on the thermistor NTC 40 can reflect temperature.Therefore, analog to digital converter input pin ADC_TEMP can learn external temperature according to the level on the thermistor NTC 40.Particularly, the level signal of thermistor NTC 40 inserts the analog to digital converter input pin ADC_TEMP pin of main control chip MCU 10, through obtaining the voltage value of a correspondence after the analog-to-digital conversion, in main control chip MCU 10, preset and store a voltage temperature mapping table, the magnitude of voltage that gets through analog-to-digital conversion according to the level on the thermistor NTC 40 is inquired about in the voltage temperature mapping table and can be drawn corresponding temperature, and show this temperature value by the display screen of mobile phone, realize the temperature survey function.
In a preferred embodiment, analog to digital converter input pin ADC_TEMP carries out analog-to-digital conversion at interval and inquires about in the voltage temperature mapping table with real-time update external temperature state at preset time.
The embodiment of the invention also provides a kind of mobile phone temp meter, and it comprises mobile phone and external temp probe.
In the embodiment of the invention, have mobile phone terminal circuit as shown in Figure 1 in the mobile phone, the external temp probe has external temperature sensing circuit shown in Figure 2, and wherein, thermistor NTC 40 is located in the external temp probe.
When external temp probe and mobile phone by USB socket 30 with after USB interface 20 is connected, mobile phone is popped one's head in by external temp just can realize detecting the function of ambient temperature.
Preferably, the external temp probe adopts heat conduction good metal material to make.Further, the external temp probe can be provided with the waterproof encapsulation, so that liquid is carried out temperature survey.
The concrete operation principle of mobile phone temp meter of the present invention and process see also preamble about the operation principle of mobile phone terminal circuit and external temperature sensing circuit and the description of the course of work, give unnecessary details no longer one by one at this.
In sum, those skilled in the art understand easily, the mobile phone that utilizes provided by the invention realizes that thermometric circuit and mobile phone temp meter have effectively improved in the prior art the accurately problem of measures ambient temperature, and the present invention adopts the external temp probe, make things convenient for user measurement environment or hot water temperature etc. when needed, it is with low cost, and is convenient and practical.
In the above-described embodiments, only the present invention has been carried out exemplary description, but those skilled in the art can carry out various modifications to the present invention after reading present patent application under the situation that does not break away from the spirit and scope of the present invention.
Claims (10)
1. one kind is utilized mobile phone to realize thermometric circuit, it is characterized in that described circuit comprises:
The mobile phone terminal circuit, comprise main control chip MCU and the USB interface that is electrically connected with described main control chip MCU, wherein, described main control chip MCU has analog to digital converter input pin ADC_TEMP, the ID pin of described USB interface is connected to described analog to digital converter input pin ADC_TEMP, and described analog to digital converter input pin ADC_TEMP also connects first end of divider resistance R1, and second end of described divider resistance R1 connects voltage source AVDD;
The external temperature sensing circuit comprises thermistor NTC and the USB socket that is electrically connected with described thermistor NTC, and the ID pin of described USB socket connects first end of described thermistor NTC, the second end ground connection of described thermistor NTC;
Wherein, described USB socket can be connected with described USB interface with plugging, and described analog to digital converter input pin ADC_TEMP learns external temperature according to the level on the thermistor NTC.
2. the mobile phone that utilizes according to claim 1 is realized thermometric circuit, it is characterized in that: store the voltage temperature mapping table among the described main control chip MCU, described analog to digital converter input pin ADC_TEMP carries out analog-to-digital conversion to the level on the described thermistor NTC and obtains a corresponding voltage value, inquires about the display screen that draws corresponding temperature and pass through described mobile phone according to described corresponding voltage value in described voltage temperature mapping table and shows.
3. the mobile phone that utilizes according to claim 2 is realized thermometric circuit, it is characterized in that: described analog to digital converter input pin ADC_TEMP carries out analog-to-digital conversion at interval and inquires about with the real-time update external temperature in described voltage temperature mapping table at preset time.
4. the mobile phone that utilizes according to claim 1 is realized thermometric circuit, it is characterized in that: described thermistor NTC is located in the external temp probe.
5. the mobile phone that utilizes according to claim 4 is realized thermometric circuit, it is characterized in that: described external temp probe is provided with the waterproof encapsulation.
6. a mobile phone temp meter is characterized in that, comprising:
Mobile phone, described mobile phone comprises main control chip MCU and the USB interface that is electrically connected with described main control chip MCU, wherein, described main control chip MCU has analog to digital converter input pin ADC_TEMP, the ID pin of described USB interface is connected to described analog to digital converter input pin ADC_TEMP, and described analog to digital converter input pin ADC_TEMP also connects first end of divider resistance R1, and second end of described divider resistance R1 connects voltage source AVDD;
The external temp probe, described external temp probe comprises thermistor NTC and the USB socket that is electrically connected with described thermistor NTC, wherein, described USB socket ID pin connects first end of described thermistor NTC, the second end ground connection of described thermistor NTC;
Wherein, described USB socket can be connected with described USB interface with plugging, and described analog to digital converter input pin ADC_TEMP learns external temperature according to the level on the thermistor NTC.
7. mobile phone temp meter according to claim 6, it is characterized in that: store the voltage temperature mapping table among the described main control chip MCU, described analog to digital converter input pin ADC_TEMP carries out analog-to-digital conversion to the level on the described thermistor NTC and obtains a corresponding voltage value, inquires about the display screen that draws corresponding temperature and pass through described mobile phone according to described corresponding voltage value in described voltage temperature mapping table and shows.
8. mobile phone temp meter according to claim 7 is characterized in that: described analog to digital converter input pin ADC_TEMP carries out analog-to-digital conversion at interval and inquires about with the real-time update external temperature in described voltage temperature mapping table at preset time.
9. mobile phone temp meter according to claim 6 is characterized in that: described external temp probe adopts thermal conductive metallic material to make.
10. according to each described mobile phone temp meter in the claim 6 to 9, it is characterized in that: described external temp probe is provided with the waterproof encapsulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010594331.4A CN102118472B (en) | 2010-12-17 | 2010-12-17 | A kind of mobile phone temp is taken into account it and is utilized mobile phone to realize thermometric circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010594331.4A CN102118472B (en) | 2010-12-17 | 2010-12-17 | A kind of mobile phone temp is taken into account it and is utilized mobile phone to realize thermometric circuit |
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| CN102118472A true CN102118472A (en) | 2011-07-06 |
| CN102118472B CN102118472B (en) | 2015-07-29 |
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| CN201010594331.4A Expired - Fee Related CN102118472B (en) | 2010-12-17 | 2010-12-17 | A kind of mobile phone temp is taken into account it and is utilized mobile phone to realize thermometric circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361488A (en) * | 2011-09-28 | 2012-02-22 | 惠州Tcl移动通信有限公司 | Mobile phone and temperature detection method based on mobile phone |
| CN102438066A (en) * | 2011-10-24 | 2012-05-02 | 惠州Tcl移动通信有限公司 | Mobile phone and temperature detection method based on same |
| CN102564615A (en) * | 2011-12-30 | 2012-07-11 | 广东步步高电子工业有限公司 | System and method for measuring external environment temperature of mobile communication terminal |
| US8909955B2 (en) | 2011-07-07 | 2014-12-09 | Blackberry Limited | Method and apparatus for providing characteristics information of a peripheral device to an electronic device by encoding the characteristic information into a power signal |
| CN110567603A (en) * | 2019-09-29 | 2019-12-13 | 杨柳 | Single ADC multichannel temperature monitoring circuit controlled by GPIO |
| CN112229535A (en) * | 2019-12-20 | 2021-01-15 | 青岛鼎信通讯股份有限公司 | External temperature measurement circuit based on electric energy meter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2831632Y (en) * | 2005-08-31 | 2006-10-25 | 中兴通讯股份有限公司 | Cell phone having function of measuring temp |
| US20090010301A1 (en) * | 2007-07-02 | 2009-01-08 | Takeshi Nagahisa | Temperature detection circuit |
-
2010
- 2010-12-17 CN CN201010594331.4A patent/CN102118472B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2831632Y (en) * | 2005-08-31 | 2006-10-25 | 中兴通讯股份有限公司 | Cell phone having function of measuring temp |
| US20090010301A1 (en) * | 2007-07-02 | 2009-01-08 | Takeshi Nagahisa | Temperature detection circuit |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8909955B2 (en) | 2011-07-07 | 2014-12-09 | Blackberry Limited | Method and apparatus for providing characteristics information of a peripheral device to an electronic device by encoding the characteristic information into a power signal |
| CN102361488A (en) * | 2011-09-28 | 2012-02-22 | 惠州Tcl移动通信有限公司 | Mobile phone and temperature detection method based on mobile phone |
| CN102361488B (en) * | 2011-09-28 | 2015-07-29 | 惠州Tcl移动通信有限公司 | Mobile phone |
| CN102438066A (en) * | 2011-10-24 | 2012-05-02 | 惠州Tcl移动通信有限公司 | Mobile phone and temperature detection method based on same |
| CN102438066B (en) * | 2011-10-24 | 2013-11-06 | 惠州Tcl移动通信有限公司 | Mobile phone and temperature detection method based on same |
| CN102564615A (en) * | 2011-12-30 | 2012-07-11 | 广东步步高电子工业有限公司 | System and method for measuring external environment temperature of mobile communication terminal |
| CN110567603A (en) * | 2019-09-29 | 2019-12-13 | 杨柳 | Single ADC multichannel temperature monitoring circuit controlled by GPIO |
| CN110567603B (en) * | 2019-09-29 | 2024-03-19 | 江苏久卫智能科技有限公司 | Single ADC multipath temperature monitoring circuit controlled by GPIO |
| CN112229535A (en) * | 2019-12-20 | 2021-01-15 | 青岛鼎信通讯股份有限公司 | External temperature measurement circuit based on electric energy meter |
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| CN102118472B (en) | 2015-07-29 |
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