CN2370405Y - Electronic wet and dry bulb hydrometer and thermometer - Google Patents
Electronic wet and dry bulb hydrometer and thermometer Download PDFInfo
- Publication number
- CN2370405Y CN2370405Y CN 99235967 CN99235967U CN2370405Y CN 2370405 Y CN2370405 Y CN 2370405Y CN 99235967 CN99235967 CN 99235967 CN 99235967 U CN99235967 U CN 99235967U CN 2370405 Y CN2370405 Y CN 2370405Y
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- China
- Prior art keywords
- temperature
- wet
- humidity
- switch
- chip microcomputer
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Abstract
The utility model relates to an electronic wet and dry bulb hydrometer and a thermometer, which is composed of a display, two temperature sensors, an address switch, a compensating code switch and a power supply which are respectively connected with a single chip machine. The single chip machine can also be connected with a communication device to receive and transmit data and realize remote monitoring and net working. Through the single chip machine to be cooperated with other elements, the utility model can be used for completing the work of measuring temperature and humidity as well as calibrating the temperature value, and automatically checks and displays the environmental temperature/humidity range, dispenses with the complex procedures of hand-operation, has low cost comparatively, broad adaptive capacity to environment and long life, and is easy to maintain.
Description
The utility model relates to the temperature that is used to measure environment such as plant or vegetables culturing room, laboratory, warehouse, office, the measurement mechanism of humidity, relates to calculate automatically the electronics wet and dry bulb Hygrothermograph of environment temperature, humidity in more detail.
The existing device that is used for measures ambient temperature, humidity mainly is a wet-and-dry bulb thermometer, and it is simple in structure, safeguards simple and easyly, and measuring and calculating is reliable.Because globe thermometer and wet bulb thermometer constitute, and all adopt mercury (or alcohol) thermometer, during use, manually measure dry-bulb temperature value and wet-bulb temperature value respectively, obtain the humidity value of environment through manually tabling look-up.There is following shortcoming in this device: 1, adopt the manual measurement temperature, and more loaded down with trivial details; 2, the acquisition humidity value of need manually tabling look-up, inconvenience; 3, can not calibrate the humiture value automatically; 4, can only obtain image data in the scene, can not realize the telemonitoring field condition.
The purpose of this utility model is the defective that exists at prior art, and a kind of temperature, the humidity that can directly measure with display environment is provided, and can realize the electronics wet and dry bulb Hygrothermograph to the calibration of humiture value.
The purpose of this utility model also is to provide a kind of electronics wet and dry bulb Hygrothermograph, except can directly measuring temperature, the humidity with display environment, and can realize can also realizing the telemonitoring field condition outside the calibration to the humiture value.
Electronics wet and dry bulb Hygrothermograph of the present utility model is made of single-chip microcomputer, display, two temperature sensors, address switch, compensation coding switches; Display, two temperature sensors, address switch, compensation coding switches are connected with single-chip microcomputer respectively.
Solidified working procedure in the single-chip microcomputer, constituted, finished the measurement wet and dry bulb temperature during master routine operation, looked into operations such as humidometer and displays temperature and humidity by master routine and plurality of sub program.Subroutine has disposed following modules:
Initialization: put each I/O port initial state, remove internal memory, establish interruption;
Display driver: write the display buffer, segment encode is tabled look-up, serial output;
Data communication: station address is differentiated, serial received, and serial sends, and communication half worker operates control;
Survey wet and dry bulb temperature: dry bulb thermometric, wet bulb thermometric, DS1820 write-in program, DS1820 read routine;
Ratio adjustment: support the humiture value to proofread and correct;
Gradual program: support the gradual demonstration of humidity;
Soft delay subroutine: use the software cycles mode, postpone 2ms, 20ms, and 1s.
Display can be existing general display, as digital tube display, LCD, is used for displays temperature value, humidity value.
Temperature sensor can directly be measured dry-bulb temperature, at temperature sensor element external application cloth parcel, cloth is immersed in water tank or the water bottle etc. during the hygrometric bulb temperature.
The compensation coding switch is a kind of parallel input string line output I/O chip, is used to revise temperature value and humidity value.
Address switch is used to read in switch value, if this switch value zero, then it goes without doing station address, and as the debugging mode operation, when non-zero just as effective address.
In order to realize remote data communication, the single-chip microcomputer of this electronics wet and dry bulb Hygrothermograph can also connect a communicator, is used for accepting and transmitting data, can adopt the communicator of models such as RS-232, RS-485, RS-422.
During use, this device can use separately, also can networking operation.During isolated operation, when feeding desired voltage, instrument is moved automatically, and order repeats displays temperature and rh value, and promptly P sign displays temperature value down at first keeps the several seconds, and the back shows rh value with the H sign.As working application, need at first dial and decide address switch, determine the station address of instrument, and be connected with bus by the communicator lead-out terminal.
The course of work of this device is as follows: 2 identical electronic temperature sensor, the gauze (wet bulb) that places air (dry bulb) respectively and be connected with flask, installing automatic measurement is done respectively, wet two temperature values, press the psychrometer principle, through the single-chip microcomputer automatic look-up table, draw humidity value, the numeral that device provides air themperature and humidity shows (all being 2 bit digital), reading can be calibrated with software by switch, device design simultaneously has the serial communication device bus interface and the address configuration switch of standard, can with the computer networking telecommunication with similar bus.
The utility model compared with prior art has following advantage:
1, because the utility model replaces mercury or alcohol thermometer with electronic thermometer, adopt single-chip microcomputer cooperate miscellaneous part finish to temperature and humidity calculate, to work such as humiture value calibrations, device of the present utility model can be measured and the display environment humiture automatically, save manually-operated numerous and diverse step;
2, the utility model needn't manually arrive the collection in worksite data owing to adopted communicator to realize remote data communication.
3, the utility model cost is relatively low, and wide adaptive capacity to environment (wide temperature humidity range) is arranged, and the long life-span, is easy to safeguard that calibration is simple.
Fig. 1 is a block diagram of the present utility model;
Fig. 2 is another block diagram of the present utility model;
Fig. 3 is a contour structures synoptic diagram of the present utility model;
Fig. 4 is a circuit diagram of the present utility model.
Below by embodiment and accompanying drawing the utility model is described in more detail.
Embodiment
As shown in Figure 1, electronics wet and dry bulb Hygrothermograph of the present utility model is made of single-chip microcomputer 1, display 2, two temperature sensors 3 and 4, address switch 5, compensation coding switches 6; Display 2, two temperature sensors 3 and 4, address switch 5, compensation coding switches 6 are connected with single-chip microcomputer 1 respectively.
As shown in Figure 2, electronics wet and dry bulb Hygrothermograph of the present utility model can also be made of single-chip microcomputer 1, display 2, two temperature sensors 3 and 4, address switch 5, compensation coding switch 6, communicators 7; Display 2, two temperature sensors 3 and 4, address switch 5, compensation coding switch 6, communicators 7 are connected with single-chip microcomputer 1 respectively.
As shown in Figure 3, cabinet 9 and water tank 10 on carriage 8, have been fixed, single-chip microcomputer 1, address switch 5, compensation coding switch 6, communicator 7 are installed in the cabinet 9, display 2 is installed in cabinet 9 fronts, temperature sensor 3 and 4 is installed in cabinet 9 lower ends, and temperature sensor 4 surfaces of hygrometric bulb temperature are with the cloth parcel and immerse water tank 10.
Can understand the object lesson of present embodiment device and each parts thereof in conjunction with Fig. 2 and Fig. 4.
Single-chip microcomputer 1: the utility model circuit is simple, and assembling easily, and is reliable, and the main program of solidifying in single-chip microcomputer that relies on is supported full machine operation.
Present embodiment selects for use AT89C2051 as single-chip microcomputer, and it is the version of reducing the staff of MCS-51 series monolithic, and except that totally 15 of I/O ports (legal copy is 32) were less, remainder and legal MCS-51 were compatible fully.This machine reset circuit does not adopt common R-C mode, and has adopted the new product of the MAXIM company special chip MAX810 that resets, and this chip can produce the positive reset pulse of wide about 240ms automatically when powering on, and makes the single-chip microcomputer start-up routine operation that resets.And also can produce reset pulse because of loose contact causes during of short duration beating at power supply, prevent the deadlock phenomenon that therefore occurs.It is main vibration source that this machine is selected the 18.432MHZ crystal for use.15 road I/O are allocated as follows:
A.P1.0-P1.4 totally 5 be used for determining this machine address;
B.P3.5 is used to read dry-bulb temperature;
C.P3.4 is used to read wet-bulb temperature;
D.P1.5, P1.6 are used for driving and show;
E.P3.0, P3.1, P1.7 is used for data communication;
F.P3.2, P3.3, P3.7 are used to read correction parameter.
Solidified operating software among the AT89C2051, program is made of master routine and plurality of sub program, finishes the measurement wet and dry bulb temperature during master routine operation, looks into operations such as humidometer and displays temperature and humidity.Solidified a relative humidity table in program, the temperature difference of its " OK " is by 1 ℃ of division, and its " row " are demarcated wet-bulb depression by 0.5 ℃ of division, have taken 40% the program space.
Tabling look-up and reading and used the plurality of data handling procedure in the relative humidity:
B1 proofreaies and correct: be used to proofread and correct the dry-bulb temperature deviation
B2 proofreaies and correct: be used to proofread and correct the wet-bulb temperature deviation
B3 proofreaies and correct: be used to proofread and correct the value ratio.
Along with the difference of wet bulb assembly technology, introduce different corrections, now get 4 retainings 0% ,-10% ,-15% ,-20% to obtain each horizontal consistance of showing of humidity value.
Gradual correction: the beating property during minimizing humidity is tabled look-up, be convenient to show humidity value, improve readable.Single-chip microcomputer has been equipped with the plurality of sub program module:
Initialization: put each I/O port initial state, remove internal memory, establish interruption;
Display driver: write the display buffer, segment encode is tabled look-up, serial output;
Data communication: station address is differentiated, serial received, and serial sends, and communication half worker operates control;
Survey wet and dry bulb temperature: dry bulb thermometric, wet bulb thermometric, DS1820 write-in program, DS1820 read routine;
Ratio adjustment: support B3 to proofread and correct;
Gradual program: support the gradual demonstration of humidity;
Soft delay subroutine: use the software cycles mode, postpone 2ms, 20ms, and 1s.
Display 2: present embodiment is joined 4 (decimal system) digital demonstration.Use static display mode, formed 32 bit shift register by 4 74HC164 and supported 4 LED charactron data presentation of sun altogether, constitute well-regulated data presentation chain, drive end is two I/O only, expand to show that chain does not increase drive end yet.Single-chip microcomputer (5) is with 2 I/O P1.5, and P1.6 supports this demonstration.Solidify display driving software in the single-chip microcomputer, be used for number of support according to the show.
Survey the temperature sensor 3 of dry-bulb temperature: constitute by a DS1820 temperature sensor.To be the nineties produced by the U.S. DALLAS company DS1820, and it is a kind of integrated temperature element, inner integrated responsive to temperature register, and address and order ROM (read-only memory) and CRC generator, it has three lead-in wires ,+5, ground and signal end.Except that power supply, only need an I/O end can insert single-chip microcomputer (5), can finish the thermometric conversion, operations such as output temperature value if in single-chip microcomputer, solidified support program.
Hygrometric bulb temperature temperature sensor 4: DS1820 constitutes by another, with 3 difference be, temperature sensor wraps up with cloth, and cloth is immersed in the water tank, can keep this element to be in the environment of 100%RH, but the moisture content that is attached to this wet bulb surface constantly evaporates, draw the wet bulb heat, wet-bulb temperature is reduced, and the humidity value of environment is more little, therefore this process more very can represent the relative humidity of environment with the temperature difference of wet and dry bulb.According to dry-bulb temperature, with wet-bulb depression, list relative humidity table, can read humidity value from tabling look-up.
Address switch 5: totally 5 of the address switches that present embodiment is selected for use, directly read the P1 mouth and can read in switch value.If this switch value zero, then it goes without doing station address, and as the debugging mode operation, when non-zero just as effective address.
Compensation coding switch 6: select a slice 74HC165 for use.Consider that data correction has B1, B2, three of B3 revise number, and wherein B1 is three, and B2 is three, and B3 is two, totally 8.But single-chip microcomputer 1 can only have 3 I/O ends vacant, inserts 74HC165, can input be extended to 8 with these 3.
74HC165 is a kind of parallel input string line output I/O chip, and it has 8 bit parallel input ends, the dual serial output terminal that phase place is opposite, and the input of two clocks, PL be the clock of packing into, PL jump down along with the parallel port data latching in 8 d type flip flops in inside.CLK1 jumps along data serial is exported down.Single-chip microcomputer 1 is connected to PL with P3.3 and produces the clock of packing into.P3.7 is connected to CLK1 and produces shift clock, and p3.2 meets Q7 and carries out the serial data reception.In single-chip microcomputer 1, solidified corresponding sequential procedure, 74HC165 parallel port data can have been read in single-chip microcomputer 1 internal memory, it has been dissolved be B1, B2, three correction parameters of B3 again.
Communicator 7: constitute communication interface with a slice RS-485 half-duplex driving chip 75176.Only be attached thereto with 3 I/O, P3.0 receives serial data, and P3.1 sends serial data, the control of P1.7 reception/transmit status.This communication interface meets the RS-485 standard, can many instrument networkings.
Requirement to power supply: the full machine operation of power supply support, its specification is+5V 150mA.Power supply is made of rectifier bridge and voltage stabilizing sheet 7812 and 7805, has bigger dynamic input range 10-20V to exchange or the direct current input, all can satisfy the instrumentation requirement.This instrument is suitable for the front end instrument as the instrument network system of unified low-voltage power supply.
The device of present embodiment can be used separately, also can networking operation.During isolated operation, when feeding desired voltage, instrument is moved automatically, and order repeats displays temperature and rh value, and promptly P sign displays temperature value down at first keeps the several seconds, and the back shows rh value with the H sign.As working application, need at first dial and decide address switch, determine the station address of instrument, and be connected with the RS-485 bus by the RS-485 lead-out terminal.Other operations are identical with independent operating.
Claims (2)
1, a kind of electronics wet and dry bulb Hygrothermograph is characterized in that being made of single-chip microcomputer, display, two temperature sensors, address switch, compensation coding switch, power supplys; Display, two temperature sensors, address switch, compensation coding switch, power supplys are connected with single-chip microcomputer respectively.
2, a kind of electronics wet and dry bulb Hygrothermograph is characterized in that being made of single-chip microcomputer, display, two temperature sensors, address switch, compensation coding switch, communicator, power supplys; Display, two temperature sensors, address switch, compensation coding switch, communicator, power supplys are connected with single-chip microcomputer respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99235967 CN2370405Y (en) | 1999-05-07 | 1999-05-07 | Electronic wet and dry bulb hydrometer and thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99235967 CN2370405Y (en) | 1999-05-07 | 1999-05-07 | Electronic wet and dry bulb hydrometer and thermometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2370405Y true CN2370405Y (en) | 2000-03-22 |
Family
ID=34023845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99235967 Expired - Fee Related CN2370405Y (en) | 1999-05-07 | 1999-05-07 | Electronic wet and dry bulb hydrometer and thermometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2370405Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833077A (en) * | 2010-05-27 | 2010-09-15 | 中达电通股份有限公司 | Wireless battery sampling parameter calibration method and system |
| CN102435715A (en) * | 2011-09-15 | 2012-05-02 | 上海工程技术大学 | Coal dust humidity detection system |
| CN106382828A (en) * | 2016-08-31 | 2017-02-08 | 广东汉维科技有限公司 | Meteorological station for measuring temperature of dry bulb and wet bulb |
-
1999
- 1999-05-07 CN CN 99235967 patent/CN2370405Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833077A (en) * | 2010-05-27 | 2010-09-15 | 中达电通股份有限公司 | Wireless battery sampling parameter calibration method and system |
| CN102435715A (en) * | 2011-09-15 | 2012-05-02 | 上海工程技术大学 | Coal dust humidity detection system |
| CN106382828A (en) * | 2016-08-31 | 2017-02-08 | 广东汉维科技有限公司 | Meteorological station for measuring temperature of dry bulb and wet bulb |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |