CN103323132A - Agricultural vinyl house low-temperature warning device - Google Patents
Agricultural vinyl house low-temperature warning device Download PDFInfo
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- CN103323132A CN103323132A CN2013103033784A CN201310303378A CN103323132A CN 103323132 A CN103323132 A CN 103323132A CN 2013103033784 A CN2013103033784 A CN 2013103033784A CN 201310303378 A CN201310303378 A CN 201310303378A CN 103323132 A CN103323132 A CN 103323132A
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Abstract
The invention discloses an agricultural vinyl house low-temperature warning device which is characterized by comprising a 3V direct-current power supply, a temperature threshold detection circuit, a sound effect generation circuit and a voice frequency amplifying circuit, wherein the temperature threshold detection circuit consists of a dual-metal-sheet temperature controller WK and a resistor R1; the sound effect generation circuit consists of a sound effect integrated circuit IC1 and a resistor 2; the model of KD9300 is selected for the sound effect integrated circuit IC1. The agricultural vinyl house low-temperature warning device provided by the invention utilizes the simplest dual-metal-sheet temperature controller to be responsible for detecting the environment temperature variation in a vinyl house; when the environment temperature variation in the vinyl house reduces to the threshold, a contact of the dual-metal-sheet temperature controller in the low-temperature warning device circuit is connected, so that the sound effect integrated circuit is triggered to start to operate, a voice frequency signal output by the sound effect integrated circuit is compounded and amplified through a transistor, then a loudspeaker is driven to emit warning sound, and managers are reminded of warming the vinyl house timely.
Description
Technical field
The invention belongs to electronics and temperature control technology field, relate to a kind of farm plastic greenhouse low temperature alarm device.
Background technology
Rural area common plastics film is barricaded as on the ground hot house and is used for cultivating various crops, cultivates edible fungi, artificial breeding etc.The shortcoming of this hot house is: drop in temperature is subtle in the hot house, and temperature is crossed the low crop normal growth that affect, even crosses the freeze injury of low generation crops because of low temperature.The present invention is a farm plastic greenhouse low temperature alarm device, it is responsible for detecting variation of ambient temperature in the hot house with the simplest bimetal strip thermostat, when the temperature in the hot house is reduced to threshold value, bimetal strip thermostat contacting in the low temperature alarm device circuit, making sound effect integrated circuit be subject to triggering starts working, the sound signal of sound effect integrated circuit output drives loudspeaker and sends alarm sound after the compound amplification of transistor, reminds managerial personnel in time to heat for hot house.
Farm plastic greenhouse low temperature alarm device of the present invention all uses common components and parts to make, and has that circuit structure is succinct, a dependable performance, the characteristics such as easy to use, cost of development is low, be easy to popularize in the rural area.
Below describe farm plastic greenhouse low temperature alarm device of the present invention related correlation technique content in implementation process in detail.
Summary of the invention
Goal of the invention and beneficial effect: the present invention is a farm plastic greenhouse low temperature alarm device, it is responsible for detecting the interior temperature variation of hot house with the simplest bimetal strip thermostat, when environment temperature is reduced to threshold value in the hot house, bimetal strip thermostat contacting in the low temperature alarm device circuit, making sound effect integrated circuit be subject to triggering starts working, the sound signal of sound effect integrated circuit output is after the compound amplification of transistor, drive loudspeaker and send alarm sound, remind managerial personnel in time to heat for hot house.The present invention all uses common components and parts to make, and has that circuit structure is succinct, a dependable performance, the characteristics such as easy to use, cost of development is low, be easy to popularize in the rural area.
The circuit working principle: after farm plastic greenhouse low temperature alarm device was connected the 3V direct supply, the circuit of alarm device entered the low temperature state of alert.When environment temperature was higher than design temperature, bimetal strip thermostat WK contact was in off-state, and all circuit of alarm device are not all worked, and loudspeaker BL is sounding not; When environment temperature drops to temperature threshold, bimetal strip thermostat WK contacting, making the 5th pin of sound effect integrated circuit IC1 be subject to triggering starts working, the sound signal of the 3rd pin output of sound effect integrated circuit IC1 drives loudspeaker BL and sends alarm sound after NPN transistor VT1 and the compound amplification of PNP transistor VT2.
Technical characterictic: farm plastic greenhouse low temperature alarm device, it comprises 3V direct supply, temperature threshold testing circuit, audio circuit for generating and audio amplifier circuit, it is characterized in that:
The temperature threshold testing circuit: it is comprised of bimetal strip thermostat WK and resistance R 1, one termination audio circuit for generating of the end of bimetal strip thermostat WK and resistance R 1, the anodal VCC of the other end connection circuit of resistance R 1, the other end connection circuit ground GND of bimetal strip thermostat WK;
The audio circuit for generating: it is comprised of sound effect integrated circuit IC1, resistance R 2, it is KD9300 that sound effect integrated circuit IC1 selects model, the 5th pin jointing temp threshold detection circuit of sound effect integrated circuit IC1, the anodal VCC of the 6th pin connection circuit of sound effect integrated circuit IC1, cross-over connection resistance R 2 between the 7th pin of sound effect integrated circuit IC1 and the 8th pin, the 2nd pin connection circuit ground GND of sound effect integrated circuit IC1;
Audio amplifier circuit: it is comprised of NPN transistor VT1, PNP transistor VT2 and resistance R 3, the base stage of NPN transistor VT1 connects the 3rd pin of sound effect integrated circuit IC1 by resistance R 3, the collector of NPN transistor VT1 connects the base stage of PNP transistor VT2, the anodal VCC of the emitter connection circuit of PNP transistor VT2, the emitter connection circuit ground GND of NPN transistor VT1, the collector of PNP transistor VT2 is by loudspeaker BL connection circuit ground GND;
The anodal VCC of 3V dc power anode connection circuit, 3V dc power cathode connection circuit ground GND.
Description of drawings
Accompanying drawing 1 is an embodiment circuit working of farm plastic greenhouse low temperature alarm device provided by the invention schematic diagram.
Embodiment
According to farm plastic greenhouse low temperature alarm device circuit working schematic diagram and the description of drawings shown in the accompanying drawing 1, and connect according to components and parts Relations Among in the described each several part circuit of summary of the invention, and the components and parts technical parameter described in the embodiment requires and the circuit production main points are implemented to realize the present invention.Below in conjunction with embodiment correlation technique of the present invention is further described.
The selection of components and parts and technical parameter
VT1 is NPN transistor, and selecting model is 2CS9013 or 2CS8050, enlargement factor β 〉=150;
VT2 is PNP transistor, and selecting model is 2CS9015, enlargement factor β 〉=150;
IC1 is sound effect integrated circuit, and selecting model is KD9300 or CW9300, and packing forms is soft encapsulation; Rectangular indentation both sides pin in the soft encapsulation is the 7th pin, the 8th pin, and large tracts of land Copper Foil connection circuit ground GND is printed with the positive pole of the pin connection circuit of VDD or VCC printed words, is printed with IN, the OUT printed words are respective pins;
Resistance is selected 1/4W carbon resister or metalfilmresistor, and the resistance of resistance R 1 is 150K Ω, and the resistance of resistance R 2 is 220K Ω, and the resistance of resistance R 1 is 1.5K Ω;
BL selects 0.5W, 8 Ω D.sp.s;
WK is bimetal strip thermostat, selects the product of manual preset temperature function.
Circuit production main points and circuit debugging
Because of the circuit structure of farm plastic greenhouse low temperature alarm device fairly simple, as long as the electronic devices and components performance of selecting generally speaking is intact, and the components and parts annexation in the accompanying drawing 1 is welded to specifications, physical connection line and welding quality are through after carefully checking correctly, and circuit of the present invention does not substantially need to carry out any debugging and can work.
Claims (1)
1. farm plastic greenhouse low temperature alarm device, it comprises 3V direct supply, temperature threshold testing circuit, audio circuit for generating and audio amplifier circuit, it is characterized in that:
Described temperature threshold testing circuit is comprised of bimetal strip thermostat WK and resistance R 1, one termination audio circuit for generating of the end of bimetal strip thermostat WK and resistance R 1, the anodal VCC of the other end connection circuit of resistance R 1, the other end connection circuit ground GND of bimetal strip thermostat WK;
Described audio circuit for generating is comprised of sound effect integrated circuit IC1, resistance R 2, it is KD9300 that sound effect integrated circuit IC1 selects model, the 5th pin jointing temp threshold detection circuit of sound effect integrated circuit IC1, the anodal VCC of the 6th pin connection circuit of sound effect integrated circuit IC1, cross-over connection resistance R 2 between the 7th pin of sound effect integrated circuit IC1 and the 8th pin, the 2nd pin connection circuit ground GND of sound effect integrated circuit IC1;
Described audio amplifier circuit is comprised of NPN transistor VT1, PNP transistor VT2 and resistance R 3, the base stage of NPN transistor VT1 connects the 3rd pin of sound effect integrated circuit IC1 by resistance R 3, the collector of NPN transistor VT1 connects the base stage of PNP transistor VT2, the anodal VCC of the emitter connection circuit of PNP transistor VT2, the emitter connection circuit ground GND of NPN transistor VT1, the collector of PNP transistor VT2 is by loudspeaker BL connection circuit ground GND;
The anodal VCC of described 3V dc power anode connection circuit, 3V dc power cathode connection circuit ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103033784A CN103323132A (en) | 2013-07-18 | 2013-07-18 | Agricultural vinyl house low-temperature warning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103033784A CN103323132A (en) | 2013-07-18 | 2013-07-18 | Agricultural vinyl house low-temperature warning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103323132A true CN103323132A (en) | 2013-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013103033784A Pending CN103323132A (en) | 2013-07-18 | 2013-07-18 | Agricultural vinyl house low-temperature warning device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004433A (en) * | 2015-05-26 | 2015-10-28 | 周玉林 | Agricultural greenhouse temperature drop alarm apparatus |
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| US20040125855A1 (en) * | 2002-12-27 | 2004-07-01 | Yi-Chia Liao | Electronic water temperature measuring apparatus |
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| CN2876916Y (en) * | 2006-03-07 | 2007-03-07 | 张巍 | Music switch alarm door bell |
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| CN203364996U (en) * | 2013-07-18 | 2013-12-25 | 黄月华 | An agricultural plastic house low-temperature alarm apparatus |
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|---|---|---|---|---|
| US20040125855A1 (en) * | 2002-12-27 | 2004-07-01 | Yi-Chia Liao | Electronic water temperature measuring apparatus |
| CN2694736Y (en) * | 2003-12-15 | 2005-04-27 | 宋亚南 | Greenhouse multipurpose plant protaction instrument |
| CN2876916Y (en) * | 2006-03-07 | 2007-03-07 | 张巍 | Music switch alarm door bell |
| CN201108741Y (en) * | 2007-12-19 | 2008-09-03 | 天津三星电子有限公司 | Sound controlled music Santa Claus |
| CN202075061U (en) * | 2011-05-31 | 2011-12-14 | 佳木斯大学 | Greenhouse temperature detector |
| CN202189441U (en) * | 2011-08-26 | 2012-04-11 | 王旭 | Temperature and humidity alarm |
| CN102494796A (en) * | 2011-12-05 | 2012-06-13 | 黄勇 | Agricultural shed and greenhouse three-grade temperature monitoring device |
| CN202501931U (en) * | 2012-03-09 | 2012-10-24 | 成都思茂科技有限公司 | Temperature alarm for rice seedling bed |
| CN203364996U (en) * | 2013-07-18 | 2013-12-25 | 黄月华 | An agricultural plastic house low-temperature alarm apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004433A (en) * | 2015-05-26 | 2015-10-28 | 周玉林 | Agricultural greenhouse temperature drop alarm apparatus |
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Application publication date: 20130925 |