CN217385306U

CN217385306U - Rainwater induction circuit and rainwater inductor

Info

Publication number: CN217385306U
Application number: CN202221094011.7U
Authority: CN
Inventors: 徐开靖
Original assignee: Ningbo Hanchi Electromechanical Co ltd
Current assignee: Ningbo Hanchi Electromechanical Co ltd
Priority date: 2022-05-09
Filing date: 2022-05-09
Publication date: 2022-09-06
Anticipated expiration: 2032-05-09

Abstract

The application discloses rainwater sensing circuit and rainwater inductor includes: the sensor is provided with two wiring terminals, the control chip is respectively connected with the two wiring terminals, the control chip alternately outputs positive and negative and positive level signals to the two wiring terminals, the level signals of the two wiring terminals are opposite, one wiring terminal is connected with the control chip through a triode, and the control chip detects the voltage change of the sensor through the triode. The output and detection of the anode and the cathode are controlled through the chip, so that the water on the surface of the sensor is prevented from generating electrolytic reaction, and the service life of the sensor is prolonged.

Description

Rainwater induction circuit and rainwater inductor

Technical Field

The application relates to the field of rainwater sensors, in particular to a rainwater sensing circuit and a rainwater sensor.

Background

Rain sensors are commonly used in the agricultural irrigation field to detect rain and automatically adjust the irrigation process based on the detected information. Moreover, continuous rainfall data can help users use the intelligent system to automatically water crops only when needed. The rain sensor can be expanded in other fields, such as the automobile field, and the wiper can be fully automated by using a rain detection system; for example, in the home field, the home automation system may also automatically close a window and adjust a room temperature using a rain detection function.

The rain sensor circuit is an important detection circuit in the rain sensor. However, the existing rain sensing circuit has the following problems: water falls on the sensor and the sensor is energized, which causes electrolysis of the water to oxidize. This in turn results in a metal sheet on the sensor which is easily electrolytically polarized to quickly rust, and which does not have a long service life.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a rainwater sensing circuit and rainwater inductor, control output and the detection of positive negative pole through the chip, prevent that the water on sensor surface from taking place the electrolytic reaction, prolong the life of sensor.

The technical scheme adopted by the application is as follows: a rain sensing circuit comprising: the sensor is provided with two wiring terminals, the control chip is respectively connected with the two wiring terminals, the control chip alternately outputs positive and negative and positive level signals to the two wiring terminals, the level signals of the two wiring terminals are opposite, one wiring terminal is connected with the control chip through a triode, and the control chip detects the voltage change of the sensor through the triode.

Compared with the prior art, the control core is connected with the two terminals of the sensor, and the control board outputs positive and negative levels to the two terminals alternately, so that the positive and negative electrodes of the sensor surface after being electrified can be changed all the time, and the electrolytic reaction on the sensor surface is prevented. This can greatly increase the service life of the sensor, thereby increasing the service life of the rain sensor.

In addition, the control chip also needs to be connected with the sensor through a triode to detect the voltage change of the sensor. In the present application, a sensor for detecting rain water is known, which typically consists of two copper wires laid on a substrate, designed in such a way that the sensor can provide a high resistance to the supply voltage in dry conditions, and the output voltage of the sensor is 5V. The resistance of the sensor gradually decreases as the humidity on the substrate increases. As the resistance decreases, its output voltage also decreases relative to the humidity on the sensor.

In some embodiments of the present application, the transistor is an NPN transistor, a base of the transistor is connected to the terminal of the sensor, an emitter of the transistor is grounded, and a collector of the transistor is connected to the control chip. The triode plays a role of amplifying the detected sensor electrical signal.

In some embodiments of the present application, the two terminals of the sensor are a first pin and a second pin, where the first pin is connected to the PoleL pin of the control chip through a fifth resistor, and the second pin is connected to the PoleH pin of the control chip through a fourth resistor.

When the control chip outputs the positive level signal to the first pin, the control chip outputs the negative level signal to the second pin. When the control chip outputs a negative level signal to the first pin, the control chip outputs a positive level signal to the second transistor.

In some embodiments of the present application, the control chip is a chip of model HT67F 4892.

A rainwater sensor comprises a control device arranged in a shell, wherein the control device comprises a control circuit and a rainwater sensing circuit.

In some embodiments of the present application, the housing surface is provided with a display panel and a button assembly, and the display panel is connected with the control device. The display panel displays the current state of the rainwater sensor; the button assembly is connected with the control device, and the control device is operated by operating the button assembly.

Specifically, the display panel adopts an LCD.

In some embodiments of the present application, the housing is provided with a water inlet pipe interface and at least one water outlet pipe interface. Specifically, the shell is provided with two water outlet pipe interfaces, the calibers of the two water outlet pipe interfaces are different, and the surface of each water outlet pipe interface is provided with an external thread.

The water inlet pipe interface is an internal thread interface, and a locking nut is arranged outside the water inlet pipe interface. The water inlet pipe interface in the application is a standard interface and can be connected with a common water outlet.

Specifically, a three-way pipe is arranged in the shell, and the water inlet pipe connector is communicated with the two water outlet pipe connectors through the three-way pipe.

In some embodiments of the present application, a partition is disposed in the housing, and the partition separates the water outlet pipe interface and the water inlet pipe interface from the control device and the display panel. This application is through setting up the space separation in with the casing into two relatively independent spaces promptly, and one of them space is used for laying the pipeline, and another space is used for electronic components.

In some embodiments of the present application, the sensor is mounted to a surface of the housing. I.e. rain can directly contact the sensor.

Preferably, the surface of the shell is provided with a mounting groove which is matched with the structure of the sensor, the sensor is mounted in the mounting groove, and the surface of the sensor is flush with the edge of the mounting groove. Namely, rainwater is prevented from gathering at the sensor, and the detection precision is prevented from being influenced. Also avoid after the raining, the sensor position can't be dry naturally for a long time to influence subsequent irrigation that waters.

In some embodiments of the present application, the housing is provided with a battery compartment, a surface of the battery compartment is covered by a detachable outer cover, and the battery compartment is located on a back surface of the display panel of the housing.

Drawings

The present application will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of illustrating the preferred embodiments and therefore should not be taken as limiting the scope of the present application. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on conceptual representations of elements or structures depicted and may contain exaggerated displays and are not necessarily drawn to scale.

FIG. 1 is a schematic diagram of the rain sensing circuit principle of the present application;

fig. 2 is a schematic structural view of the rain sensor of the present application;

fig. 3 is an internal structure schematic diagram of the rain sensor of the present application.

Detailed Description

The present application will now be described in detail with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

A rain sensing circuit, as shown in fig. 1: the method comprises the following steps: the sensor P3, the triode Q2 and the control chip, the sensor P3 have two terminals, the control chip is connected with the two terminals respectively, the control chip alternately outputs positive and negative and positive level signals to the two terminals, the level signals of the two terminals are opposite, one terminal is connected with the control chip through a triode, and the control chip detects the voltage change of the sensor P3 through the triode Q2.

According to the control chip, the control core is connected with the two terminals of the sensor P3, and the control board alternately outputs positive and negative levels to the two terminals, so that the electrified positive and negative electrodes on the surface of the sensor P3 can be changed all the time, and the electrolytic reaction on the surface of the sensor P3 is prevented. This can greatly increase the service life of the sensor P3, thereby increasing the service life of the rain sensor. In addition, the control chip needs to be connected with the sensor P3 through a triode to detect the voltage change of the sensor P3. In the present application, the sensor P3 for detecting rain is a prior art, the sensor P3 is usually composed of two copper wires laid on a substrate, and is designed in such a way that the sensor P3 can provide a high resistance to the supply voltage in dry conditions, and the output voltage of the sensor P3 is 5V. The resistance of the sensor P3 gradually decreases as the humidity on the substrate increases. As the resistance decreases, its output voltage also decreases relative to the humidity at sensor P3.

The triode Q2 is an NPN type triode Q2, the base electrode of the triode Q2 is connected with the wiring terminal of the sensor P3, the emitting electrode of the triode Q2 is grounded, and the collecting electrode of the triode Q2 is connected with the control chip. Transistor Q2 functions to amplify the sensed electrical signal from sensor P3.

The control chip adopts a chip with the model number of HT67F 4892. The two terminals of the sensor P3 are a first pin and a second pin, wherein the first pin is connected to the PoleL pin of the control chip through a fifth resistor R5, and the second pin is connected to the PoleH pin of the control chip through a fourth resistor R4. When the control chip outputs the positive level signal to the first pin, the control chip outputs the negative level signal to the second pin. When the control chip outputs a negative level signal to the first pin, the control chip outputs a positive level signal to the second transistor.

A rain sensor, as shown in fig. 2 and 3, comprises a control device installed in a housing 1, wherein the control device comprises a control circuit and a rain sensing circuit.

The surface of the shell 1 is provided with a display panel 2 and a button assembly 3, and the display panel 2 is connected with a control device. The display panel 2 displays the current state of the rainwater sensor; the button assembly 3 is connected with the control device, and the control device is operated by operating the button assembly 3. Specifically, the display panel 2 adopts an LCD liquid crystal display.

The shell 1 is provided with a water inlet pipe connector 4 and at least one water outlet pipe connector 5. Specifically, the shell 1 is provided with two water outlet pipe connectors 5, the calibers of the two water outlet pipe connectors 5 are different, and the surface of the water outlet pipe connector 5 is provided with external threads. The water inlet pipe joint 4 is an internal thread joint, and a locking nut is arranged outside the water inlet pipe joint 4. The water inlet pipe connector 4 in the application is a standard connector and can be connected with a general water outlet. Specifically, a three-way pipe is arranged in the shell 1, and the water inlet pipe joint 4 is communicated with the two water outlet pipe joints 5 through the three-way pipe.

The shell 1 is internally provided with a partition plate 6, and the partition plate 6 separates the water outlet pipe connector 5 and the water inlet pipe connector 4 from the control device and the display panel 2. This application is through setting up space partition 6 with the space partition in the casing 1 promptly to two relatively independent spaces, and one of them space is used for laying the pipeline, and another space is used for laying electronic components.

The sensor is arranged on the surface of the shell 1. I.e. rain can directly contact the sensor. Preferably, the surface of the shell 1 is provided with a mounting groove adapted to the structure of the sensor, the sensor is mounted in the mounting groove, and the surface of the sensor is flush with the edge of the mounting groove. Namely, rainwater is prevented from gathering at the sensor, and the detection precision is prevented from being influenced. Also avoid after the raining, the sensor position can't be dry naturally for a long time to influence subsequent irrigation that waters.

The casing 1 be provided with battery compartment 7, the battery compartment 7 surface is covered by detachable enclosing cover 8, battery compartment 7 is located the display panel 2 looks back of casing 1.

The present application has been described in detail above, and specific examples thereof are used herein to explain the principles and implementations of the present application, which are presented solely to aid in understanding the present application and its core concepts. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims

1. A rain sensing circuit, comprising: the sensor is provided with two wiring terminals, the control chip is respectively connected with the two wiring terminals, the control chip alternately outputs positive and negative and positive level signals to the two wiring terminals, the level signals of the two wiring terminals are opposite, one wiring terminal is connected with the control chip through a triode, and the control chip detects the voltage change of the sensor through the triode.

2. The rainwater sensing circuit according to claim 1, wherein said triode is an NPN type triode, a base of the triode is connected to a terminal of the sensor, an emitter of the triode is grounded, and a collector of the triode is connected to the control chip.

3. A rain sensing circuit according to claim 1 or claim 2, wherein the control chip is of the type HT67F 4892.

4. The rain sensing circuit according to claim 3, wherein the two terminals of the sensor are a first pin and a second pin, the first pin is connected to the PoleL pin of the control chip through a fifth resistor, and the second pin is connected to the PoleH pin of the control chip through a fourth resistor.

5. A rain sensor comprising a control means mounted in a housing, said control means comprising a control circuit and a rain sensing circuit according to any one of claims 1 to 4.

6. A rain sensor according to claim 5, wherein a display panel and button assembly are provided on the surface of the housing, the display panel being connected to the control means; the display panel adopts an LCD.

7. A rain sensor according to claim 5, wherein the housing is provided with a water inlet pipe interface and at least one water outlet pipe interface.

8. The rainwater sensor according to claim 7, wherein the casing is provided with two water outlet pipe connectors, the diameters of the two water outlet pipe connectors are different, the surface of the water outlet pipe connector is provided with external threads, the casing is internally provided with a three-way pipe, and the water inlet pipe connector is communicated with the two water outlet pipe connectors through the three-way pipe.

9. The rainwater sensor according to claim 7, wherein the water inlet pipe joint is an internal thread joint, a locking nut is arranged outside the water inlet pipe joint, and the water inlet pipe joint is a standard joint and can be connected with a common water outlet.

10. The rain sensor according to claim 8, wherein a partition is provided in the housing, and separates the water outlet pipe interface and the water inlet pipe interface from the control device and the display panel.