CN102426178A - Bridge type humidity indicator for seedling raising shed - Google Patents
Bridge type humidity indicator for seedling raising shed Download PDFInfo
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- CN102426178A CN102426178A CN2011102995330A CN201110299533A CN102426178A CN 102426178 A CN102426178 A CN 102426178A CN 2011102995330 A CN2011102995330 A CN 2011102995330A CN 201110299533 A CN201110299533 A CN 201110299533A CN 102426178 A CN102426178 A CN 102426178A
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Abstract
The invention relates to a bridge type humidity indicator for a seedling raising shed. The bridge type humidity indicator comprises a direct-current power supply DC, a bridge type humidity signal detection circuit and a humidity signal comparison circuit, and a humidity signal amplification circuit and a humidity state indication circuit; a humidity sensitive sensor RS is prepared from the tube core of an NPN type transistor 3DG6, and pins of the humidity sensitive sensor RS respectively use a collector electrode c and an emitter electrode e of the 3DG6. According to the invention, the humidity sensitive sensor of the bridge type humidity indicator carries out sampling, humidity signals are compared by using an integrated operational amplifier and are amplified by the humidity signal amplification circuit, and finally, an LED light emitting diode is utilized to indicate the change of humidity in the seedling raising shed. Compared to existing humidity indicators on the market, the bridge type humidity indicator provided in the invention has the characteristics of a simple and convenient circuit structure, small usage amount of components, reliable circuit performance, low cost for fabrication and development, convenient usage, easy popularization, etc.
Description
Technical field
The invention belongs to the application of electronic technology field, relate to a kind of seedling culture shed and use the bridge type humidity indicator.
Background technology
The rural area for seedling morning, educate the shape seedling, be to improve the environment temperature in spring, the common plastics film is barricaded as simple seedling culture shed on the ground and cultivates rice shoot.The shortcoming of this seedling culture shed is that humidity is excessive often in the plastic greenhouse, influences the normal growth of rice shoot, and grows the rice shoot disease easily.Of the present invention is a bridge type seedling canopy humidity indicator; By the moisture sensor sampling, moisture signal compares through integrated operational amplifier, passes through signal amplification circuit then; Adopt the humidity in the LED light emitting diode indication seedling culture shed to change at last, very convenient to use.
Below specify seedling culture shed of the present invention with bridge type humidity indicator related correlation technique content in manufacturing process.
Summary of the invention
Goal of the invention and beneficial effect: of the present invention is that a seedling culture shed is with bridge type seedling canopy humidity indicator; It is sampled by moisture sensor; Moisture signal compares through integrated operational amplifier; Through signal amplification circuit, adopt the humidity in the LED light emitting diode indication seedling culture shed to change at last then.Seedling culture shed of the present invention compares with bridge type humidity indicator and existing on the market humidity indicator, has characteristics such as circuit structure is simple and direct, the components and parts consumption is few, circuit performance reliable, the making cost of development is low, easy to use, be easy to popularize.
Technical scheme: seedling culture shed is used the bridge type humidity indicator, is made up of direct supply DC, bridge type moisture signal testing circuit and moisture signal comparator circuit, moisture signal amplifying circuit and moisture condition indicating circuit, and its characteristic comprises:
Bridge type moisture signal testing circuit and moisture signal comparator circuit: form by moisture sensor RS, potentiometer RP and resistance R 1, resistance R 2 and integrated operational amplifier IC1; The anodal VCC of the collector c of moisture sensor RS and a termination circuit of resistance R 1; 3 pin of the termination integrated operational amplifier IC1 of the emitter e of moisture sensor RS and potentiometer RP; 2 pin of another termination integrated operational amplifier IC1 of resistance R 1; The one termination circuit ground GND of the other end of potentiometer RP and lever arm thereof and resistance R 2; 2 pin of another termination integrated operational amplifier IC1 of resistance R 2, the anodal VCC of the 7 pin connection circuits of integrated operational amplifier IC1, the 4 pin connection circuit ground GND of integrated operational amplifier IC1;
Moisture sensor RS adopts the die making of NPN transistor 3DG6, and its pin uses collector c and the emitter e of 3DG6 respectively;
Moisture signal amplifying circuit: form by NPN transistor VT1, resistance R 3, resistance R 4; The end of the base stage connecting resistance R3 of NPN transistor VT1; 6 pin of the other end integrated operational amplifier IC1 of resistance R 3; The end of the collector connecting resistance R4 of NPN transistor VT1, the anodal VCC of the other end connection circuit of resistance R 4, the emitter connection circuit ground GND of NPN transistor VT1;
Moisture condition indicating circuit: form by NPN transistor VT2, resistance R 5 and red light emitting diodes LED1, green LED LED2; The negative pole of the base stage of NPN transistor VT2 and red light emitting diodes LED1 connects the collector of NPN transistor VT1; The collector of NPN transistor VT2 connects the negative pole of green LED LED2; The end of the anodal connecting resistance R5 of the positive pole of red light emitting diodes LED1 and green LED LED2; The anodal VCC of the other end connection circuit of resistance R 5, the emitter connection circuit ground GND of NPN transistor VT2.
The composition of other circuit and the annexation between the element
The positive pole of direct supply DC connects the end of power switch SW, and the other end of power switch SW links to each other with circuit anode VCC, and the negative pole of direct supply DC links to each other with circuit ground GND.
The circuit working principle: the bridge type humidity measuring circuit is formed highly sensitive bridge diagram by moisture sensor RS, resistance R 1, resistance R 2, potentiometer RP.
After the power switch SW closure; Circuitry is started working; In seedling culture shed humidity just often, the resistance of moisture sensor RS is bigger, integrated operational amplifier IC1 is higher than normal phase input end current potential output low level because of the inverting input current potential; NPN transistor VT1 ends, and red light emitting diodes LED1 is not luminous; NPN transistor VT2 conducting, green LED LED2 is luminous, and humidity is normal in the indication seedling culture shed.
When if humidity increases in the seedling culture shed; Then the resistance of moisture sensor RS diminishes, and when humidity surpassed the humidity value of setting, integrated operational amplifier IC1 exported high level because of the normal phase input end current potential is higher than the inverting input current potential; Make NPN transistor VT1 conducting; Red light emitting diodes LED1 is luminous, and humidity is excessive in the indication seedling culture shed, reminds you in time to ventilate to reduce humidity in the seedling culture shed; NPN transistor VT2 ends simultaneously, and green LED LED2 extinguishes.
Description of drawings
Accompanying drawing 1 is the embodiment circuit working schematic diagram of seedling culture shed with the bridge type humidity indicator; The negative pole of direct supply DC links to each other with circuit ground GND in the accompanying drawing 1.
Embodiment
According to circuit working schematic diagram and the description of drawings of seedling culture shed shown in the accompanying drawing 1 with the bridge type humidity indicator; And according to the annexation between the components and parts in the described each several part circuit of summary of the invention, and the components and parts technical parameter described in the embodiment requires to implement to realize the present invention.
Components and parts are selected and technical parameter
RS is a moisture sensor, and the tube core that utilizes NPN transistor is to the susceptibility that humidity changes, and selects for use β value greater than 100 NPN transistor 3DG6 making.After at first frustrating the metal cap of this NPN transistor; Place it in then in the strong brine and dry after the immersion; Resistance value should be greater than 200K Ω between this transistorized collector c of actual measurement and the emitter e when drying, and resistance value is to get final product about 10K Ω between its collector c and the emitter e when humidity is maximum;
LED1 is a red light emitting diodes, and LED2 is a green LED, and 2 light emitting diodes are all selected the light emitting diode of ￠ 5mm for use;
IC1 is an integrated operational amplifier, and model can be selected μ A741 or 5624 types for use, and it is 8 pin dual-in-line packages; Its functions of pins is: 2 pin and 3 pin are anti-phase and in-phase input end; 6 pin are output terminal, and 7 pin are positive and negative power end, and 1 pin and 5 pin are imbalance zeroing end;
VT1 and VT2 are NPN transistor, can select NPN transistors such as 3DG6 or 2CS9013 for use;
R1～R5 selects 1/4W metalfilmresistor or carbon resister for use, and the resistance of resistance R 1～R5 is respectively: 51K Ω, 51K Ω, 1K Ω, 15K Ω, 620 Ω;
RP selects accurate solid or multi-circle wirewound potentiator for use, and its resistance is 220K Ω;
SW selects small-sized one pole tumble power switch for use; Direct supply DC selects the 9V laminated cell for use.
Circuit production and circuit debugging
Seedling culture shed with the circuit of bridge type humidity indicator so long as the electronic devices and components performance of using is intact; Annexation according to components and parts shown in the accompanying drawing 1 is welded; And the physical connection line conscientiously checked and check; And install, welding errorless after, circuit generally need not be debugged can operate as normal.
During circuit debugging, use 500 type pointer multimeters, the black meter pen of multimeter meets collector c, red test pencil sending and receiving emitter-base bandgap grading e, and when on 3DG6 transistor RS tube core, breathing out hot gas with mouth, the multimeter pointer should be swung to the right rapidly, promptly changes toward the little direction of resistance value; After the water vapor on 3DG6 transistor dies evaporation, indicator can be put left gradually and get back to initial position and be normally.The resistance of regulator potentiometer RP can be set the early warning humidity value that needs in advance.
Claims (2)
1. a seedling culture shed is used the bridge type humidity indicator, is made up of direct supply DC, bridge type moisture signal testing circuit and moisture signal comparator circuit, moisture signal amplifying circuit and moisture condition indicating circuit, and its characteristic comprises:
Bridge type moisture signal testing circuit and moisture signal comparator circuit are made up of moisture sensor RS, potentiometer RP and resistance R 1, resistance R 2 and integrated operational amplifier IC1; The anodal VCC of the collector c of moisture sensor RS and a termination circuit of resistance R 1; 3 pin of the termination integrated operational amplifier IC1 of the emitter e of moisture sensor RS and potentiometer RP; 2 pin of another termination integrated operational amplifier IC1 of resistance R 1; The one termination circuit ground GND of the other end of potentiometer RP and lever arm thereof and resistance R 2; 2 pin of another termination integrated operational amplifier IC1 of resistance R 2, the anodal VCC of the 7 pin connection circuits of integrated operational amplifier IC1, the 4 pin connection circuit ground GND of integrated operational amplifier IC1;
Moisture sensor RS adopts the die making of NPN transistor 3DG6, and its pin uses collector c and the emitter e of 3DG6 respectively;
The moisture signal amplifying circuit is made up of NPN transistor VT1, resistance R 3, resistance R 4; The end of the base stage connecting resistance R3 of NPN transistor VT1; 6 pin of the other end integrated operational amplifier IC1 of resistance R 3; The end of the collector connecting resistance R4 of NPN transistor VT1, the anodal VCC of the other end connection circuit of resistance R 4, the emitter connection circuit ground GND of NPN transistor VT1;
The moisture condition indicating circuit is made up of NPN transistor VT2, resistance R 5 and red light emitting diodes LED1, green LED LED2; The negative pole of the base stage of NPN transistor VT2 and red light emitting diodes LED1 connects the collector of NPN transistor VT1; The collector of NPN transistor VT2 connects the negative pole of green LED LED2; The end of the anodal connecting resistance R5 of the positive pole of red light emitting diodes LED1 and green LED LED2; The anodal VCC of the other end connection circuit of resistance R 5, the emitter connection circuit ground GND of NPN transistor VT2.
2. seedling culture shed according to claim 1 is used the bridge type humidity indicator; It is characterized in that: the positive pole of direct supply DC connects the end of power switch SW; The other end of power switch SW links to each other with circuit anode VCC, and the negative pole of direct supply DC links to each other with circuit ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102995330A CN102426178A (en) | 2011-10-08 | 2011-10-08 | Bridge type humidity indicator for seedling raising shed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102995330A CN102426178A (en) | 2011-10-08 | 2011-10-08 | Bridge type humidity indicator for seedling raising shed |
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| Publication Number | Publication Date |
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| CN102426178A true CN102426178A (en) | 2012-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011102995330A Pending CN102426178A (en) | 2011-10-08 | 2011-10-08 | Bridge type humidity indicator for seedling raising shed |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520022A (en) * | 2012-01-01 | 2012-06-27 | 魏传永 | Humidity display for agricultural greenhouse |
| CN110070685A (en) * | 2019-06-18 | 2019-07-30 | 吴圣铎 | Seeder seed blocks acousto-optic reminiscences |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3979667A (en) * | 1974-01-02 | 1976-09-07 | Diplex Limited | Electrical indicators |
| US4122389A (en) * | 1977-05-23 | 1978-10-24 | Tandy Corporation | Moisture sensor |
| JPS6014149A (en) * | 1983-07-05 | 1985-01-24 | Sharp Corp | Detector for absolute humidity |
| JPS6373043A (en) * | 1986-07-23 | 1988-04-02 | Sanyo Electric Co Ltd | Humidifier |
| JPH05164721A (en) * | 1991-12-16 | 1993-06-29 | Sharp Corp | Humidity detecting circuit |
| KR20000032377A (en) * | 1998-11-13 | 2000-06-15 | 전주범 | Dropping alarm circuit for pcb in refrigerator |
| CN202221421U (en) * | 2011-10-08 | 2012-05-16 | 黄宇嵩 | Bridge type humidity indicator for seedling raising greenhouses |
-
2011
- 2011-10-08 CN CN2011102995330A patent/CN102426178A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3979667A (en) * | 1974-01-02 | 1976-09-07 | Diplex Limited | Electrical indicators |
| US4122389A (en) * | 1977-05-23 | 1978-10-24 | Tandy Corporation | Moisture sensor |
| JPS6014149A (en) * | 1983-07-05 | 1985-01-24 | Sharp Corp | Detector for absolute humidity |
| JPS6373043A (en) * | 1986-07-23 | 1988-04-02 | Sanyo Electric Co Ltd | Humidifier |
| JPH05164721A (en) * | 1991-12-16 | 1993-06-29 | Sharp Corp | Humidity detecting circuit |
| KR20000032377A (en) * | 1998-11-13 | 2000-06-15 | 전주범 | Dropping alarm circuit for pcb in refrigerator |
| CN202221421U (en) * | 2011-10-08 | 2012-05-16 | 黄宇嵩 | Bridge type humidity indicator for seedling raising greenhouses |
Non-Patent Citations (1)
| Title |
|---|
| 周继明等: "《传感器技术与应用》", 28 February 2009, article "简易秧棚湿度指示器", pages: 343 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520022A (en) * | 2012-01-01 | 2012-06-27 | 魏传永 | Humidity display for agricultural greenhouse |
| CN110070685A (en) * | 2019-06-18 | 2019-07-30 | 吴圣铎 | Seeder seed blocks acousto-optic reminiscences |
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Application publication date: 20120425 |