CN106768459B - A kind of Temperature and Humidity circuit and control method - Google Patents
A kind of Temperature and Humidity circuit and control method Download PDFInfo
- Publication number
- CN106768459B CN106768459B CN201611150388.9A CN201611150388A CN106768459B CN 106768459 B CN106768459 B CN 106768459B CN 201611150388 A CN201611150388 A CN 201611150388A CN 106768459 B CN106768459 B CN 106768459B
- Authority
- CN
- China
- Prior art keywords
- interface
- timing
- resistance
- signal
- time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
- G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/045—Circuits
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Automation & Control Theory (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Nonlinear Science (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The present invention discloses a kind of Temperature and Humidity circuit, including with the first I/O interface, the 2nd I/O interface, the 3rd I/O interface and the single-chip microcontroller for interrupting control interface；Charging circuit with the integration module comprising charge and discharge capacitance and comparison module；The humistor being connected with the first I/O interface, the thermistor being connected with the 2nd I/O interface and the fixed value resistance being connected with the 3rd I/O interface；Integration module is also connected with humistor, thermistor and fixed value resistance respectively, single-chip microcontroller is connected by the interruption control interface with the comparison module, for completing the timing to the charge and discharge capacitance charging time by comparing module, and the resistance value of thermistor and humistor is calculated according to timing time and corresponding temperature and humidity information are obtained according to resistance value.This programme avoids the problem that single-chip microcontroller is using A D interface acquisition signal and bring is at high cost, effectively increases measurement accuracy of the program within the scope of entire relative humiture.
Description
Technical field
The invention belongs to Temperature and Humidity technical field more particularly to a kind of Temperature and Humidity circuit and control methods
Background technique
In conventional Temperature and Humidity circuit, for the relative humidity in air, there are many kinds of measurement method, wet and dry bulb measurements
Method, dewpoint humidity mensuration, coulometric hygrometer, chemical substance electrical characteristics method etc..As shown in Figure 1, being existing one kind to temperature
The circuit that humidity is detected.Wherein, P1.1 interface is humidity AD thief hatch, and P1.5 interface and P1.4 interface generate phase respectively
Opposite 1KHz square wave.By the partial pressure of humistor RH and fixed value resistance R1, P1.1 interface generates rectangular wave, when P1.1 interface
When for high level, humidity sampling, sampled point 100us after high level are carried out.P1.1 interface is AD thief hatch, for the inspection of temperature
Survey is also to pass through AD detection mouth.Meanwhile the humidity range of the different targeted measurements of fixed value resistance R1 is different.Therefore only in given zone
Between high-precision moisture measurement may be implemented, and except the specific sections then its measurement accurate precision it is lower.
Summary of the invention
The embodiment of the present invention provides a kind of Temperature and Humidity circuit, it is intended to single-chip microcontroller be kept not have the premise of AD thief hatch
The lower detection for realizing temperature and humidity, while effectively improving the accuracy of moisture measurement.
The embodiments of the present invention are implemented as follows, a kind of Temperature and Humidity circuit, and the Temperature and Humidity circuit includes: tool
There are the first I/O interface, the 2nd I/O interface, the 3rd I/O interface and the single-chip microcontroller for interrupting control interface；
Charging circuit with integration module and comparison module, the integration module include a charge and discharge capacitance；
The humistor being connected with the first I/O interface, the thermistor being connected with the 2nd I/O interface and with the 3rd I/
The fixed value resistance that O Interface is connected；
The integration module is also connected with humistor, thermistor and fixed value resistance respectively, for receiving it
In I/O interface output high level signal when, using the single-chip microcontroller by the resistance that is correspondingly connected with the interface to described
Charge and discharge capacitance charging；
The single-chip microcontroller is connected by the interruption control interface with the comparison module, for passing through the relatively mould
Block completes the timing to the corresponding charge and discharge capacitance charging time, and calculates the thermistor and humistor according to timing time
Resistance value and corresponding temperature and humidity information are obtained according to resistance value；
Wherein, the comparison module input terminal is also connected with the integration module output end, and comparison module is also used to root
The timing to the charge and discharge capacitance charging time is interrupted according to the output signal of the integration module.
Preferably, the integration module includes:
The DC power supply being sequentially connected in series, first resistor, second resistance and 3rd resistor；
Integrator, the positive input of the integrator are connected with one end that the first resistor connect second resistance,
The negative input of the integrator by the humistor, thermistor and fixed value resistance with corresponding I/O respectively at being connect
Mouth is connected, and the output end of the integrator is connected with the input terminal of the comparison module；
The integrator negative input and output end and connect the charge and discharge capacitance.
Preferably, the comparison module includes:
Comparator, the positive input of the comparator are connected with the output end of the integrator, the comparator
Negative input is connected with one end that the second resistance connect 3rd resistor, and the output end of the comparator passes through a current limliting
Resistance R is connected with the interruption control interface of the single-chip microcontroller.
Preferably, the resistance value of the first resistor is equal to the sum of second resistance and the resistance value of 3rd resistor, 3rd resistor
Resistance value is four times of second resistance resistance value.
The embodiments of the present invention also provide a kind of Temperature and Humidity circuit, the Temperature and Humidity circuit includes having the
The single-chip microcontroller of one I/O interface, the 2nd I/O interface and the 3rd I/O interface；
Charging circuit with charge-discharge modules, the charge-discharge modules include an electrolytic capacitor；
The humistor being connected with the first I/O interface, the thermistor being connected with the 2nd I/O interface and with the 3rd I/
The fixed value resistance that O Interface is connected；
The charge-discharge modules are also connected with humistor, thermistor and fixed value resistance respectively, for receiving
When one of I/O interface output high level signal, using the single-chip microcontroller by the resistance that is correspondingly connected with the interface to institute
State electrolytic capacitor charging；
The single-chip microcontroller is also used to carry out timing to the charging time of the electrolytic capacitor, and calculates institute according to timing time
It states the resistance value of thermistor and humistor and corresponding temperature and humidity information is obtained according to resistance value；
Wherein, the single-chip microcontroller is also used to interruption when other two I/O interface is to a low level signal wherein
Timing to the electrolytic capacitor charging time.Preferably, the humistor, thermistor and fixed value resistance also divide with it is described
The anode of electrolytic capacitor is connected, the cathode ground connection of electrolytic capacitor.
The embodiments of the present invention also provide a kind of control methods of Temperature and Humidity circuit, comprising the following steps:
The 3rd I/O interface is set as signal output according to the first input signal, the first I/O interface and the 2nd I/O interface
For signal input；
A high level signal is exported according to the 3rd I/O interface of first control signal control single chip computer, while controlling monolithic
Machine starts timing, and when interrupting control interface and receiving a signal failing edge, triggering is interrupted, and single-chip microcontroller stops timing, and records
Timing time is the first timing time T1, while the first I/O interface, the 2nd I/O interface and the 3rd I/O interface being reset to export
Low level signal；
Control single chip computer carries out timing and when timing time reaches preset time T, according to the second input signal setting the
Two I/O interfaces are signal output, and the first I/O interface and the 3rd I/O interface are signal input；
A high level signal is exported according to the 2nd I/O interface of second control signal control single chip computer, while controlling monolithic
Machine starts timing, and when interrupting control interface and receiving a signal failing edge, triggering is interrupted, and single-chip microcontroller stops timing, and records
Timing time is the second timing time T2, while the first I/O interface, the 2nd I/O interface and the 3rd I/O interface being reset to export
Low level signal；
Control single chip computer carries out timing and when timing time reaches preset time T, according to third input signal setting the
One I/O interface is signal output, and the 2nd I/O interface and the 3rd I/O interface are signal input；
A high level signal is exported according to the first I/O interface that third controls signal control single chip computer, while single-chip microcontroller is opened
Beginning timing, when interrupting control interface and receiving a signal failing edge, triggering is interrupted, and single-chip microcontroller stops timing, and when recording gauge
Time is third timing time T3, while being reset to the first I/O interface, the 2nd I/O interface and the 3rd I/O interface to export low electricity
Ordinary mail number；
Control single chip computer carries out timing and when timing time reaches preset time T, repeats the above steps；
Single-chip microcontroller is according to the first timing time T1 of record, the second timing time T2 and third timing time T3 calculating
The resistance value of thermistor and humistor, and corresponding temperature information and humidity information are obtained according to resistance value.
Preferably, single-chip microcontroller is according to the first timing time T1, the second timing time T2 and third timing time T3 of record
Calculate the resistance value of the thermistor and humistor, and the step of corresponding temperature information and humidity information are obtained according to resistance value
It specifically includes:
Single-chip microcontroller is calculated the resistance value of thermistor according to formula T2/T1*R ', and automatically by table look-up obtain it is corresponding
Temperature value；
Single-chip microcontroller is calculated the resistance value of humistor according to formula T3/T1*R ', and automatically by table look-up obtain it is corresponding
Humidity value；
Wherein, R ' is the resistance value of fixed value resistance.
The embodiments of the present invention also provide a kind of control methods of Temperature and Humidity circuit, comprising the following steps:
The 3rd I/O interface is set as signal output according to the first input signal, the first I/O interface and the 2nd I/O interface
For signal input；
A high level signal is exported according to the 3rd I/O interface of first control signal control single chip computer, while controlling monolithic
Machine starts timing, and when the first I/O interface and the 2nd I/O interface are to a low level signal, triggering is interrupted, and single-chip microcontroller stops
Only timing, and recording timing time is the first timing time T1, while by the first I/O interface, the 2nd I/O interface and the 3rd I/O
Interface is reset to output low level signal；
Control single chip computer carries out timing and when timing time reaches preset time T, according to the second input signal setting the
Two I/O interfaces are signal output, and the first I/O interface and the 3rd I/O interface are signal input；
A high level signal is exported according to the 2nd I/O interface of second control signal control single chip computer, while controlling monolithic
Machine starts timing, and when the first I/O interface and the 3rd I/O interface are to a low level signal, triggering is interrupted, and single-chip microcontroller stops
Only timing, and recording timing time is the second timing time T2, while by the first I/O interface, the 2nd I/O interface and the 3rd I/O
Interface is reset to output low level signal；
Control single chip computer carries out timing and when timing time reaches preset time T, according to third input signal setting the
One I/O interface is signal output, and the 2nd I/O interface and the 3rd I/O interface are signal input；
A high level signal is exported according to the first I/O interface that third controls signal control single chip computer, while single-chip microcontroller is opened
Beginning timing, when the 2nd I/O interface and the 3rd I/O interface are to a low level signal, triggering is interrupted, and single-chip microcontroller stops meter
When, and recording timing time is third timing time T3, while by the first I/O interface, the 2nd I/O interface and the 3rd I/O interface
It is reset to output low level signal；
Control single chip computer carries out timing and again when timing time reaches preset time T, repeats the above steps；
Single-chip microcontroller is according to the first timing time T1 of record, the second timing time T2 and third timing time T3 calculating
The resistance value of thermistor and humistor, and corresponding temperature information and humidity information are obtained according to resistance value.
Preferably, single-chip microcontroller is according to the first timing time T1, the second timing time T2 and third timing time T3 of record
Calculate the resistance value of the thermistor and humistor, and the step of corresponding temperature information and humidity information are obtained according to resistance value
It specifically includes:
Single-chip microcontroller is calculated the resistance value of thermistor according to formula T2/T1*R ', and automatically by table look-up obtain it is corresponding
Temperature value；
Single-chip microcontroller is calculated the resistance value of humistor according to formula T3/T1*R ', and automatically by table look-up obtain it is corresponding
Humidity value；
Wherein, R ' is the resistance value of fixed value resistance.
A kind of Temperature and Humidity circuit provided in an embodiment of the present invention and control method, by the I/O interface of single-chip microcontroller, simultaneously
By charging circuit to the charging of humistor, thermistor and fixed value resistance and timing charging time, by the charging time and determine
It is worth the resistance value of the available corresponding resistance of resistance value of resistance, and obtains temperature and humidity information, avoids single-chip microcontroller and connect using AD
Mouthful acquisition signal and bring problem at high cost, effectively increase measurement essence of the program within the scope of entire relative humiture
Degree, reduces measurement error.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of existing Temperature and Humidity circuit；
Fig. 2 is the structural schematic diagram for the Temperature and Humidity circuit that an embodiment of the present invention provides；
The structural schematic diagram for the Temperature and Humidity circuit that present invention another kind embodiment provides when Fig. 3；
Fig. 4 is the control method flow chart for the Temperature and Humidity circuit that an embodiment of the present invention provides；
Fig. 5 is the control method flow chart for the Temperature and Humidity circuit that another embodiment of the invention provides.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The embodiment of the present invention provides a kind of Temperature and Humidity circuit, as shown in Fig. 2, the Temperature and Humidity circuit includes
With the first I/O interface P1.0, the 2nd I/O interface P1.1, the 3rd I/O interface P1.2 and the single-chip microcontroller for interrupting control interface P1.3
MCU；
Charging circuit with integration module and comparison module, the integration module include a charge and discharge capacitance C；
The humistor RH being connected with the first I/O interface P1.0, the thermistor being connected with the 2nd I/O interface P1.1
The RT and fixed value resistance R0 being connected with the 3rd I/O interface P1.2；
The integration module is also connected with humistor RH, thermistor RT and fixed value resistance R0 respectively, integration module
For when receiving I/O interface output high level signal, using the single-chip microcontroller by being correspondingly connected with the interface
Resistance charges to the charge and discharge capacitance；
The single-chip microprocessor MCU is connected by the interruption control interface P1.3 with the comparison module, for passing through
It states comparison module and completes timing to the charge and discharge capacitance charging time, and the thermistor RT and wet is calculated according to timing time
The resistance value of quick resistance RH simultaneously obtains corresponding temperature and humidity information according to resistance value；
Wherein, the comparison module input terminal is also connected with the integration module output end, and comparison module is also used to root
The timing in the charge and discharge capacitance charging time is interrupted according to the output signal of the integration module.
Further, the integration module includes the DC power supply Vcc being sequentially connected in series, first resistor R1, the second electricity
R2 and 3rd resistor R3 is hindered, further includes an integrator A, the positive input of the integrator A and the first resistor R1 connect
The one end for meeting second resistance R2 is connected, and the negative input of the integrator A is respectively at passing through the humistor RH, temperature-sensitive
Resistance RT and fixed value resistance R0 is connected with corresponding I/O interface, and the output end of the integrator is defeated with the comparison module
Enter end to be connected.I.e. the negative input of integrator A passes through the first I/O interface of humistor RH and the single-chip microprocessor MCU
P1.0 is connected, and the negative input of integrator A passes through the 2nd I/O interface P1.1 of thermistor RT and the single-chip microprocessor MCU
It is connected, the negative input of integrator A is connected by fixed value resistance R0 with the 3rd I/O interface P1.2 of the single-chip microprocessor MCU
It connects.Wherein, also and charge and discharge capacitance C is connected in the negative input and output end of the integrator A.
Further, the comparison module includes comparator B, the positive input of the comparator B and the integrator A
Output end be connected, the negative input of the comparator B connect one end phase of 3rd resistor R3 with the second resistance R2
The output end of connection, the comparator B is connected by a current-limiting resistance R with the interruption control interface P1.2 of the single-chip microprocessor MCU
It connects.
As shown in connection with fig. 2, in order to further increase control precision of the invention, the resistance value of the first resistor R1 is equal to the
The sum of the resistance value of two resistance R2 and 3rd resistor R3, the resistance value of 3rd resistor R3 are four times of second resistance R2 resistance value.
The embodiment of the present invention also provides a kind of control method of above-mentioned Temperature and Humidity circuit, and the control method includes
Following steps:
Step S100 sets the 3rd I/O interface P1.2 as signal output according to the first input signal, the first I/O interface
P1.0 and the 2nd I/O interface P1.1 is signal input.
Step S200 exports a high level signal according to the 3rd I/O interface of first control signal control single chip computer MCU,
Control single chip computer MCU starts timing simultaneously, and when interrupting control interface P1.3 and receiving a signal failing edge, triggering is interrupted, single
Piece machine MCU stops timing, and recording timing time is the first timing time T1, while by the first I/O interface P1.0, the 2nd I/O
Interface P1.1 and the 3rd I/O interface P1.2 is reset to output low level signal；
As shown in connection with fig. 2, when exporting without level signal when the 3rd I/O interface or export low level signal, integrator is positive
The voltage of input terminal and negative input is phase isoequilibrium, as Vcc/2.The voltage of the output end of integrator is also at this time
The voltage of Vcc/2, comparator B positive input are also Vcc/2, and the output voltage of comparator negative input is less than Vcc/
2, therefore, the interruption control interface P1.3 of single-chip microprocessor MCU receives a high level signal of comparator B output at this time；When
When three I/O interfaces export a high level signal, at this moment it will break between integrator A positive input and negative input
Balance, will be charged at this time by fixed value resistance R0 to the charge and discharge capacitance C, the voltage of integrator A output end is just
Can slowly it become smaller, when being less than the voltage of comparator B negative input, the output end of comparator B will export a low level
The interruption control interface P1.3 of signal, such single-chip microprocessor MCU just will receive a failing edge.That is the first timing time T1 is logical
Fixed value resistance R0 is crossed to the charging time of the charge and discharge capacitance C.
Step S300, control single chip computer carry out timing and when timing time reaches preset time T, similarly, according to the
Two input signals set the 2nd I/O interface P1.1 as signal output, and the first I/O interface P1.0 and the 3rd I/O interface P1.2 are
Signal input；
Step S400 exports high level letter according to the 2nd I/O interface P1.1 of second control signal control single chip computer MCU
Number, while control single chip computer starts timing, when interrupting control interface and receiving a signal failing edge, triggering is interrupted, single-chip microcontroller
Stop timing, and recording timing time is the second timing time T2, while by the first I/O interface P1.0, the 2nd I/O interface P1.1
And the 3rd I/O interface P1.2 be reset to output low level signal；First timing time T2 is to pass through thermistor RT to described
The charging time of charge and discharge capacitance C.
Step S500, control single chip computer MCU carry out timing and when timing time reach preset time T, defeated according to third
Enter signal and set the first I/O interface P1.0 as signal output, the 2nd I/O interface P1.1 and the 3rd I/O interface are signal input
Mouth P1.2；
Step S600 exports a high level signal according to the first I/O interface P1.0 that third controls signal control single chip computer,
Single-chip microcontroller starts timing simultaneously, and when interrupting control interface P1.3 and receiving a signal failing edge, triggering is interrupted, and single-chip microcontroller stops
Only timing, and recording timing time is third timing time T3, at the same by the first I/O interface P1.0, the 2nd I/O interface P1.1 and
3rd I/O interface P1.2 is reset to output low level signal；Third timing time T3 is to pass through humistor RH to fill to described
The charging time of discharge capacity C.
Step S700, control single chip computer carry out timing and when timing time reach preset time T, repeat the above steps；
Wherein, the single-chip microprocessor MCU is according to the first timing time T1, the second timing time T2 and third meter recorded every time
When time T3 calculate the resistance value of the thermistor RT and humistor RH, and corresponding temperature information and wet is obtained according to resistance value
Spend information.
Further, when single-chip microprocessor MCU is according to the first timing time T1, the second timing time T2 and third timing of record
Between T3 calculate the resistance value of the thermistor RT and humistor RH, and corresponding temperature information is obtained according to resistance value and humidity is believed
The step of breath, specifically includes:
The resistance value of thermistor RT is calculated according to formula T2/T1*R ' for single-chip microprocessor MCU, and obtains automatically by tabling look-up
Corresponding temperature value；Single-chip microprocessor MCU is calculated the resistance value of humistor RH according to formula T3/T1*R ', and automatically by tabling look-up
Obtain corresponding humidity value；Wherein, R ' is the resistance value of fixed value resistance R0.
In the present embodiment, the resistance value R ' of the fixed value resistance R0 is preferably 10K ' Ω, and the preset time is preferably 250 millis
Second.
As shown in figure 3, the present invention provides the Temperature and Humidity circuits of another embodiment, including there is the first I/O
The single-chip microcontroller of interface P1.0, the 2nd I/O interface P1.1 and the 3rd I/O interface P1.2；
Charging circuit with charge-discharge modules, the charge-discharge modules include an electrolytic capacitor EC；
The humistor RH being connected with the first I/O interface P1.0, the thermistor being connected with the 2nd I/O interface P1.1
The RT and fixed value resistance R0 being connected with the 3rd I/O interface P1.2；
The charge-discharge modules are also connected with humistor RH, thermistor RT and fixed value resistance RO respectively, are used for
When receiving one of I/O interface output high level signal, using the single-chip microprocessor MCU by being correspondingly connected with the interface
Resistance charges to the electrolytic capacitor EC；
The single-chip microcontroller is also used to carry out timing to the charging time of the electrolytic capacitor EC, and is calculated according to timing time
The resistance value of the thermistor RT and humistor RH simultaneously obtains corresponding temperature and humidity information according to resistance value；
Wherein, the single-chip microcontroller is also used to interruption when other two I/O interface is to a low level signal wherein
Timing to the electrolytic capacitor charging time.
Further, the humistor RH, thermistor RT and fixed value resistance R0 are respectively with the electrolytic capacitor EC's
Anode is connected, the cathode ground connection of electrolytic capacitor EC.
As shown in figure 5, the present invention also provides the control method of the Temperature and Humidity circuit of above-described embodiment, including following step
It is rapid:
Step S000 sets the 3rd I/O interface P1.2 as signal output according to the first input signal, the first I/O interface
P1.0 and the 2nd I/O interface P1.1 is signal input；
Step S001 exports high level letter according to the 3rd I/O interface P1.2 of first control signal control single chip computer MCU
Number, while control single chip computer MCU starts timing, when the first I/O interface P1.0 and the 2nd I/O interface P1.1 receive a low electricity
It triggers and interrupts when ordinary mail, single-chip microprocessor MCU stops timing, and recording timing time is the first timing time T1, while by first
I/O interface P1.0, the 2nd I/O interface P1.1 and the 3rd I/O interface P1.2 are reset to output low level signal.
Step S002, control single chip computer MCU carry out timing and when timing time reach preset time T, defeated according to second
Enter signal and set the 2nd I/O interface P1.1 as signal output, the first I/O interface P1.0 and the 3rd I/O interface P1.2 are signal
Input port；
Step S003 exports high level letter according to the 2nd I/O interface P1.1 of second control signal control single chip computer MCU
Number, while control single chip computer starts timing, when the first I/O interface P1.0 and the 3rd I/O interface P1.2 receive a low level
It triggers and interrupts when signal, single-chip microprocessor MCU stops timing, and recording timing time is the second timing time T2, while by the first I/O
Interface P1.0, the 2nd I/O interface P1.1 and the 3rd I/O interface P1.2 are reset to output low level signal；
Step S004, control single chip computer MCU carry out timing and when timing time reach preset time T, defeated according to third
Enter signal and set the first I/O interface P1.0 as signal output, the 2nd I/O interface P1.1 and the 3rd I/O interface P1.2 are signal
Input port；
Step S005 exports high level letter according to the first I/O interface P1.0 that third controls signal control single chip computer MCU
Number, while single-chip microprocessor MCU starts timing, when the 2nd I/O interface P1.1 and the 3rd I/O interface P1.2 receives a low level letter
Number when triggering interrupt, single-chip microprocessor MCU stops timing, and recording timing time is third timing time T3, while the first I/O being connect
Mouth P1.0, the 2nd I/O interface P1.1 and the 3rd I/O interface P1.2 are reset to output low level signal；
Step S006, control single chip computer MCU carry out timing and again when timing time reach preset time T, in repetition
State step；
Wherein, single-chip microprocessor MCU can be according to the first timing time T1, the second timing time T2 and the third timing recorded every time
Time T3 calculates the resistance value of the thermistor RT and humistor RH, and obtains corresponding temperature information and humidity according to resistance value
Information.
In the present embodiment, single-chip microprocessor MCU is according to the first timing time T1, the second timing time T2 and third timing of record
Time T3 calculates the resistance value of the thermistor RT and humistor RH, and obtains corresponding temperature information and humidity according to resistance value
The step of information, specifically includes:
The resistance value of thermistor is calculated according to formula T2/T1*R ' for single-chip microprocessor MCU, and automatically by acquisition pair of tabling look-up
The resistance value of humistor is calculated according to formula T3/T1*R ' for the temperature value answered, single-chip microcontroller, and automatically by acquisition pair of tabling look-up
The humidity value answered；Wherein, R ' is the resistance value of fixed value resistance R0.
To sum up, the technical solution in the embodiment of the present invention, which does not need single-chip microprocessor MCU, has the function of AD.The interface of single-chip microcontroller
P1.0, P1.1, P1.2 are common I/O mouthfuls, and certain interruption control interface may be I/O interface, can be according to reality
Border situation flexible Application, while technical solution of the present invention can measure, consistency in humidity measuring circuit measurable range
Higher, error is smaller.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (5)
1. a kind of Temperature and Humidity circuit, which is characterized in that the Temperature and Humidity circuit includes: with the first I/O interface,
Two I/O interfaces, the 3rd I/O interface and the single-chip microcontroller for interrupting control interface；
Charging circuit with integration module and comparison module, the integration module include a charge and discharge capacitance；
The humistor being connected with the first I/O interface, the thermistor being connected with the 2nd I/O interface and connects with the 3rd I/O
The fixed value resistance that mouth is connected；
The integration module is also connected with humistor, thermistor and fixed value resistance respectively, for receiving wherein one
When a I/O interface output high level signal, using the single-chip microcontroller by the resistance that is correspondingly connected with the interface to the charge and discharge
Electric capacitor charging；
The single-chip microcontroller is connected by the interruption control interface with the comparison module, for complete by the comparison module
The timing in corresponding charge and discharge capacitance charging time in pairs, and calculate according to timing time the resistance of the thermistor and humistor
It is worth and corresponding temperature and humidity information is obtained according to resistance value；
Wherein, the comparison module input terminal is also connected with the integration module output end, and comparison module is also used to according to institute
The output signal for stating integration module interrupts the timing to the charge and discharge capacitance charging time；
The integration module includes: the DC power supply being sequentially connected in series, first resistor, second resistance, 3rd resistor, and integral
Device；
The comparison module includes: comparator, and the positive input of the comparator is connected with the output end of the integrator,
The negative input of the comparator is connected with one end that the second resistance connect 3rd resistor, the output of the comparator
End is connected by a current-limiting resistance with the interruption control interface of the single-chip microcontroller；
The integrator negative input and output end and connect the charge and discharge capacitance.
2. Temperature and Humidity circuit according to claim 1, which is characterized in that the positive input of the integrator and institute
The one end for stating first resistor connection second resistance is connected, and the negative input of the integrator is electric respectively at passing through the wet sensitive
Resistance, thermistor and fixed value resistance are connected with corresponding I/O interface, the output end of the integrator and the comparison module
Input terminal is connected.
3. Temperature and Humidity circuit according to claim 1, which is characterized in that the resistance value of the first resistor is equal to second
The sum of resistance and the resistance value of 3rd resistor, the resistance value of 3rd resistor are four times of second resistance resistance value.
4. a kind of control method of Temperature and Humidity circuit as described in claim 1, which comprises the following steps:
The 3rd I/O interface is set as signal output according to the first input signal, and the first I/O interface and the 2nd I/O interface are letter
Number input port；
A high level signal is exported according to the 3rd I/O interface of first control signal control single chip computer, while control single chip computer is opened
Beginning timing, when interrupting control interface and receiving a signal failing edge, triggering is interrupted, and single-chip microcontroller stops timing, and when recording gauge
Time is the first timing time T1, while being reset to the first I/O interface, the 2nd I/O interface and the 3rd I/O interface to export low electricity
Ordinary mail number；
Control single chip computer carries out timing and when timing time reaches preset time T, sets the 2nd I/O according to the second input signal
Interface is signal output, and the first I/O interface and the 3rd I/O interface are signal input；
A high level signal is exported according to the 2nd I/O interface of second control signal control single chip computer, while control single chip computer is opened
Beginning timing, when interrupting control interface and receiving a signal failing edge, triggering is interrupted, and single-chip microcontroller stops timing, and when recording gauge
Time is the second timing time T2, while being reset to the first I/O interface, the 2nd I/O interface and the 3rd I/O interface to export low electricity
Ordinary mail number；
Control single chip computer carries out timing and when timing time reaches preset time T, sets the first I/O according to third input signal
Interface is signal output, and the 2nd I/O interface and the 3rd I/O interface are signal input；
A high level signal is exported according to the first I/O interface that third controls signal control single chip computer, while single-chip microcontroller starts to count
When, when interrupting control interface and receiving a signal failing edge, triggering is interrupted, and single-chip microcontroller stops timing, and records timing time
For third timing time T3, while the first I/O interface, the 2nd I/O interface and the 3rd I/O interface are reset to output low level letter
Number；
Control single chip computer carries out timing and when timing time reaches preset time T, repeats the above steps；
Wherein, single-chip microcontroller is counted according to the first timing time T1, the second timing time T2 and third timing time T3 recorded every time
The resistance value of the thermistor and humistor is calculated, and corresponding temperature information and humidity information are obtained according to resistance value.
5. control method according to claim 4, which is characterized in that single-chip microcontroller is according to the first timing time recorded every time
T1, the second timing time T2 and third timing time T3 calculate the resistance value of the thermistor and humistor, and according to resistance value
The step of obtaining corresponding temperature information and humidity information specifically includes:
The resistance value of thermistor is calculated according to formula T2/T1*R ' for single-chip microcontroller, and obtains corresponding temperature automatically by tabling look-up
Value；
The resistance value of humistor is calculated according to formula T3/T1*R ' for single-chip microcontroller, and obtains corresponding humidity automatically by tabling look-up
Value；
Wherein, R ' is the resistance value of fixed value resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611150388.9A CN106768459B (en) | 2016-12-14 | 2016-12-14 | A kind of Temperature and Humidity circuit and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611150388.9A CN106768459B (en) | 2016-12-14 | 2016-12-14 | A kind of Temperature and Humidity circuit and control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106768459A CN106768459A (en) | 2017-05-31 |
| CN106768459B true CN106768459B (en) | 2019-11-12 |
Family
ID=58876911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611150388.9A Active CN106768459B (en) | 2016-12-14 | 2016-12-14 | A kind of Temperature and Humidity circuit and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106768459B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095155B (en) * | 2019-05-21 | 2021-08-10 | 深圳洲斯移动物联网技术有限公司 | Control method, temperature and humidity detection device and temperature and humidity detection system |
| CN110398519B (en) * | 2019-08-26 | 2022-03-11 | 广西玉柴机器集团有限公司 | Three-array NOx sensor measuring circuit |
| CN111679598B (en) * | 2020-05-18 | 2023-12-29 | 惠州拓邦电气技术有限公司 | Method and device for acquiring detection information of sensor |
| CN111912461B (en) * | 2020-08-09 | 2024-08-27 | 广东尚研电子科技有限公司 | Humidity detection device and fault detection method thereof |
| CN114353865B (en) * | 2021-12-13 | 2024-04-16 | 广东盈科电子有限公司 | Temperature and humidity detection circuit and temperature and humidity detection method |
| CN114441607B (en) * | 2021-12-31 | 2024-04-16 | 深圳市壹号能源科技有限公司 | Humidity monitoring system and method of back-up energy storage system |
| CN118054688B (en) * | 2024-04-12 | 2024-07-02 | 深圳力高新能技术有限公司 | Circuit and method for regulating and balancing positive and negative bus voltage |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2206211A (en) * | 1987-06-12 | 1988-12-29 | Turnright Controls | Sensor circuit |
| CN105547514A (en) * | 2016-01-25 | 2016-05-04 | 四川长虹电器股份有限公司 | Temperature measurement circuit and method |
| CN105698957A (en) * | 2016-03-21 | 2016-06-22 | 四川长虹电器股份有限公司 | Temperature measuring circuit and method |
-
2016
- 2016-12-14 CN CN201611150388.9A patent/CN106768459B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2206211A (en) * | 1987-06-12 | 1988-12-29 | Turnright Controls | Sensor circuit |
| CN105547514A (en) * | 2016-01-25 | 2016-05-04 | 四川长虹电器股份有限公司 | Temperature measurement circuit and method |
| CN105698957A (en) * | 2016-03-21 | 2016-06-22 | 四川长虹电器股份有限公司 | Temperature measuring circuit and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106768459A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106768459B (en) | A kind of Temperature and Humidity circuit and control method | |
| US10355321B2 (en) | Method and device for detecting states of battery and battery pack | |
| WO2018196121A1 (en) | Method and device for use in determining internal short circuit of battery | |
| JP6406825B2 (en) | System and method for detecting battery capacity | |
| US9891285B2 (en) | Battery fuel gauge | |
| TWI491901B (en) | Battery metering method, metering device and battery-powered equipment | |
| CN106461732A (en) | Method for estimating the state of health of a battery | |
| TW201834348A (en) | Method and apparatus for calibrating coulomb counting based state-of-charge estimation | |
| WO2019140956A1 (en) | Electricity quantity metering accuracy detection method, device and computer storage medium | |
| BR112012026599B1 (en) | skin contact detector and personal care device | |
| WO2016101661A1 (en) | Battery capacity calculation system and method | |
| JP3752888B2 (en) | Battery state detection device | |
| WO2019057006A1 (en) | Battery detection method | |
| CN106932726A (en) | A kind of battery core method for detecting health status | |
| WO2020125407A1 (en) | Method and device for detecting internal resistance of battery and method and device for detecting ageing of battery | |
| CN104898737A (en) | Temperature acquisition fault self-diagnosis system | |
| CN108732502A (en) | The acquisition methods and device of residual time length workable for equipment | |
| CN116953360B (en) | Insulation resistance rapid detection method of energy storage equipment | |
| CN110133528B (en) | Internal resistance measuring device and method for online self-learning lithium battery | |
| CN107656140A (en) | A kind of method and circuit that resistance is measured using embeded processor digital port | |
| CN110133506B (en) | Device and method for calculating remaining service time of lithium battery | |
| CN109633451A (en) | Energy-storage system is from trajectory parameters scaling method and SOC estimation method | |
| CN113514771B (en) | Battery impedance life estimation method and system | |
| CN108983109A (en) | Electric current estimation chip, evaluation method and remaining capacity metering system for battery | |
| CN206331094U (en) | A kind of battery data detection means and terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |