Safety detection device of cat litter basin and intelligent cat litter basin

Abstract

The utility model relates to the technical field of cat litter basins, and discloses a safety detection device of a cat litter basin and an intelligent cat litter basin, the safety detection device comprises an in-bin detection module, an inlet detection module, an out-bin detection module, a weight detection module and a microcontroller; the in-bin detection module is arranged in a bin of the cat litter basin and is used for detecting whether organisms exist in the cat litter basin or not; the inlet detection modules are arranged on the two sides of an inlet of the cat litter basin and used for detecting whether organisms enter the bin or not. The out-bin detection module is arranged outside the inlet of the cat litter basin and is used for detecting whether organisms exist near the inlet of the cat litter basin or not; the weight detection module is arranged at the bottom of the cat litter basin and used for detecting the weight of the cat litter basin; the microcontroller is used for receiving the detection result and judging whether the cat litter basin enters a cleaning mode or not. According to the safety detection device, the accuracy of biological detection is improved, the probability of misjudgment is effectively reduced, and the safety and reliability of the intelligent cat litter basin are improved.

Description

Technical Field

[0001] This application relates to the field of cat litter box technology, and in particular to a safety detection device for a cat litter box and a smart cat litter box. Background Technology

[0002] With the continuous advancement of technology and people's increasing pursuit of a higher quality of life, various intelligent products are widely used in people's lives. Automatic litter boxes, as a new type of cleaning product, have gained recognition and use from many cat-owning families. Before entering cleaning mode, intelligent litter boxes need to determine whether there are any living organisms in the box. However, current intelligent litter boxes on the market do not have comprehensive biological detection capabilities. When abnormal biological detection occurs, it can easily lead to misjudgment, compromising the safety of the litter box during use. Utility Model Content

[0003] In view of this, the present application provides a safety detection device for a cat litter box and a smart cat litter box, which can effectively improve the safety of using a smart cat litter box.

[0004] In a first aspect, embodiments of this application provide a safety detection device for a cat litter box, including: an in-box detection module, an entrance detection module, an external detection module, a weight detection module, and a microcontroller;

[0005] The in-chamber detection module is installed inside the litter box, and the in-chamber detection module is used to detect whether there are any living organisms inside the litter box;

[0006] The entrance detection module is located on both sides of the entrance of the litter box, and the entrance detection module is used to detect whether the organism has entered the box;

[0007] The external detection module is installed outside the entrance of the litter box, and is used to detect whether there are any living organisms near the entrance of the litter box.

[0008] The weight detection module is located at the bottom of the litter box, and the weight detection module is used to detect the weight of the litter box.

[0009] The microcontroller is used to receive the detection results from the in-chamber detection module, the entrance detection module, the outside-chamber detection module, and the weight detection module, and to determine whether to put the litter box into cleaning mode based on the detection results.

[0010] In a first possible embodiment of the first aspect, the in-warehouse detection module includes a biosensing unit and an identification interface unit, wherein a first end of the identification interface unit is connected to the biosensing unit and a second end of the identification interface unit is connected to the microcontroller;

[0011] The biosensing unit is used to identify the presence and distance of the organism, and the identification interface unit is used to transmit the identification result of the biosensing unit to the microcontroller.

[0012] In a second possible embodiment of the first aspect, the identification interface unit includes a first connector, a first current-limiting resistor, a second current-limiting resistor, a first grounding capacitor, and an inductor;

[0013] The first end of the first connector is connected to the first end of the first grounding capacitor and the first end of the inductor, respectively. The second end of the first grounding capacitor is grounded, the second end of the inductor is connected to the power supply, and the second end of the first connector is grounded.

[0014] The third end of the first connector is connected to the first end of the first current-limiting resistor, the second end of the first current-limiting resistor is connected to the microcontroller, the fourth end of the first connector is connected to the first end of the second current-limiting resistor, and the second end of the second current-limiting resistor is connected to the microcontroller.

[0015] In a third possible embodiment of the first aspect, the inlet detection module includes a second connector, a first transient suppression diode, a second transient suppression diode, an infrared emitting diode, a phototransistor, a third current-limiting resistor, a fourth current-limiting resistor, a fifth current-limiting resistor, and a second grounding capacitor;

[0016] The first end of the second connector is connected to the first end of the phototransistor, and the first end of the second connector is also used for grounding. The second end of the second connector is connected to the second end of the phototransistor, the first end of the third current-limiting resistor, and the first end of the fourth current-limiting resistor, respectively.

[0017] The second end of the third current-limiting resistor is connected to the first end of the fifth current-limiting resistor, the series node of the third current-limiting resistor and the fifth current-limiting resistor is connected to the power supply, the second end of the fourth current-limiting resistor is connected to the microcontroller and the first end of the second grounding capacitor respectively, and the second end of the second grounding capacitor is grounded;

[0018] The third end of the second connector is connected to the first end of the first transient suppression diode, the first end of the infrared emitting diode, and the microcontroller, respectively. The second end of the fifth current-limiting resistor is connected to the first end of the second transient suppression diode. The second ends of both the first transient suppression diode and the second transient suppression diode are grounded. The fourth end of the second connector is connected to the second end of the infrared emitting diode and the series node of the fifth current-limiting resistor and the second transient suppression diode.

[0019] In a fourth possible embodiment of the first aspect, the external detection module includes a motion detection unit and a motion detection interface unit, wherein a first end of the motion detection interface unit is connected to the motion detection unit, and a second end of the motion detection interface unit is connected to the microcontroller;

[0020] The motion detection unit is used to sense the movement of the organism, and the motion detection interface unit is used to transmit the detection results of the motion detection unit to the microcontroller.

[0021] In a fifth possible embodiment of the first aspect, the motion detection interface unit includes a third connector, a filter capacitor, and a sixth current-limiting resistor;

[0022] The first end of the third connector is connected to the power supply, the second end of the third connector is grounded, the first end of the filter capacitor is connected to the power supply, the second end of the filter capacitor is grounded, the third end of the third connector is connected to the first end of the sixth current-limiting resistor, and the second end of the sixth current-limiting resistor is connected to the microcontroller.

[0023] In a sixth possible embodiment of the first aspect, the weight detection module includes a gravity sensing unit and a signal processing unit, wherein a first end of the signal processing unit is connected to the gravity sensing unit, and a second end of the signal processing unit is connected to the microcontroller;

[0024] The gravity sensing unit is used to measure the weight of the litter box and output a differential signal;

[0025] The signal processing unit is used to amplify the differential signal and convert it from analog to digital to voltage data, and transmit the voltage data to the microcontroller so that the microcontroller can determine the weight change of the litter box based on the voltage data.

[0026] In a seventh possible embodiment of the first aspect, the gravity sensing unit includes four resistance strain gauges and four fourth connectors, and the signal processing unit includes an analog conversion chip and peripheral circuitry.

[0027] The welding wire of the fourth connector connects the resistance strain gauges in series.

[0028] In an eighth possible embodiment of the first aspect, the microcontroller is specifically configured to determine that the litter box has entered a cleaning mode when the in-box detection module, the entrance detection module, and the outside-box detection module have not detected the organism, and the weight detection module has detected a change in the weight of the litter box.

[0029] When at least one of the in-chamber detection module, the entrance detection module, and the outside-chamber detection module detects the organism, the litter box is determined to stop cleaning.

[0030] Secondly, embodiments of this application provide an intelligent cat litter box, including a litter box body and the aforementioned cat litter box safety detection device.

[0031] The embodiments of this application have the following beneficial effects:

[0032] This embodiment of a cat litter box safety detection device includes: an in-chamber detection module, an entrance detection module, an external detection module, a weight detection module, and a microcontroller. The in-chamber detection module is located inside the litter box and is used to detect the presence of living organisms inside. The entrance detection module is located on both sides of the entrance to the litter box and is used to detect whether living organisms have entered the chamber. The external detection module is located outside the entrance to the litter box and is used to detect the presence of living organisms near the entrance. The weight detection module is located at the bottom of the litter box and is used to detect the weight of the litter box. The microcontroller receives the detection results from the in-chamber, entrance, external, and weight detection modules and determines whether to put the litter box into cleaning mode based on the results. Based on this solution, the safety detection device improves the accuracy of biological detection, effectively reduces the probability of false positives, and enhances the safety and reliability of the smart litter box. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This invention illustrates a structural schematic diagram of a safety detection device for a cat litter box according to an embodiment of this application;

[0035] Figure 2 A circuit diagram of an identification interface unit according to an embodiment of this application is shown;

[0036] Figure 3 A circuit diagram of an inlet detection module according to an embodiment of this application is shown;

[0037] Figure 4 This paper shows a circuit diagram of a motion detection interface unit according to an embodiment of the present application;

[0038] Figure 5 A circuit diagram of a weight detection module according to an embodiment of this application is shown;

[0039] Figure 6 A schematic diagram of a first architecture of the smart litter box according to an embodiment of this application is shown;

[0040] Figure 7 A schematic diagram of a second architecture for the smart litter box according to an embodiment of this application is shown;

[0041] Figure 8 A schematic diagram of a third architecture for the smart litter box according to an embodiment of this application is shown.

[0042] Explanation of key component symbols:

[0043] 100 - Litter box safety detection device; 110 - Internal detection module; 111 - Biosensor unit; 112 - Identification interface unit; 120 - Entrance detection module; 130 - External detection module; 131 - Motion detection unit; 132 - Motion detection interface unit; 140 - Weight detection module; 141 - Gravity sensor unit; 142 - Signal processing unit; 150 - Microcontroller. Detailed Implementation

[0044] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0045] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0046] In the following text, the terms "comprising," "having," and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more combinations thereof. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0047] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0048] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0049] Figure 1 A schematic diagram of a litter box safety detection device 100 according to an embodiment of this application is shown. Exemplarily, the litter box safety detection device 100 includes an in-chamber detection module 110, an entrance detection module 120, an external detection module 130, a weight detection module 140, and a microcontroller 150. Specifically, the in-chamber detection module 110, the entrance detection module 120, the external detection module 130, and the weight detection module 140 are respectively connected to the microcontroller 150, so that the microcontroller 150 receives the detection results from the in-chamber detection module 110, the entrance detection module 120, the external detection module 130, and the weight detection module 140.

[0050] In this embodiment, the in-chamber detection module 110 is installed inside the litter box and is used to detect whether there are any living organisms inside the litter box; the entrance detection module 120 is installed on both sides of the entrance of the litter box and is used to detect whether any living organisms have entered the in-chamber; the outside-chamber detection module 130 is installed outside the entrance of the litter box and is used to detect whether there are any living organisms near the entrance of the litter box; the weight detection module 140 is installed at the bottom of the litter box and is used to detect the weight of the litter box; the microcontroller 150 is used to receive the detection results from the in-chamber detection module 110, the entrance detection module 120, the outside-chamber detection module 130, and the weight detection module 140, and to determine whether to put the litter box into cleaning mode based on the detection results.

[0051] As an example, if any one of the in-chamber detection module 110, entrance detection module 120, and outside-chamber detection module 130 detects a living organism, and the weight detection circuit detects an increase in weight, it indicates that a living organism has used the litter box. If none of the in-chamber detection module 110, entrance detection module 120, or outside-chamber detection module 130 detects a living organism, and the weight detection circuit detects an increase in the weight of feces in the litter box, the litter box will enter cleaning mode to promptly remove the feces.

[0052] For example, in one embodiment, the microcontroller 150 is specifically configured to determine that the litter box has entered cleaning mode when the in-box detection module 110, the entrance detection module 120, and the outside-box detection module 130 have not detected any living organisms, and the weight detection module 140 has detected a change in the weight of the litter box; and to determine that the litter box stops cleaning when at least one of the in-box detection module 110, the entrance detection module 120, and the outside-box detection module 130 has detected a living organism.

[0053] To better understand the safety detection device 100 for the litter box, the following is a detailed description of each component of the safety detection device 100 for the litter box.

[0054] In this embodiment, the in-warehouse detection module 110 includes a biosensing unit 111 and an identification interface unit 112. The first end of the identification interface unit 112 is connected to the biosensing unit 111, and the second end of the identification interface unit 112 is connected to the microcontroller 150. The biosensing unit 111 is used to identify the presence and distance of organisms, and the identification interface unit 112 is used to transmit the identification results of the biosensing unit 111 to the microcontroller 150. Exemplary, such as... Figure 2 As shown, the identification interface unit 112 includes a first connector J1, a first current-limiting resistor R1, a second current-limiting resistor R2, a first grounding capacitor C1, and an inductor L1. The first terminal of the first connector J1 is connected to the first terminal of the first grounding capacitor C1 and the first terminal of the inductor L1. The second terminal of the first grounding capacitor C1 is grounded to GND, and the second terminal of the inductor L1 is connected to the power supply VDD. The second terminal of the first connector J1 is grounded to GND. The third terminal of the first connector J1 is connected to the first terminal of the first current-limiting resistor R1, and the second terminal of the first current-limiting resistor R1 is connected to the microcontroller 150. The fourth terminal of the first connector J1 is connected to the first terminal of the second current-limiting resistor R2, and the second terminal of the second current-limiting resistor R2 is connected to the microcontroller 150. Specifically, the second terminal of the first current-limiting resistor R1 is connected to the data transmission output pin USART_TX of the microcontroller 150, and the second terminal of the second current-limiting resistor R2 is connected to the data reception input pin USART_RX of the microcontroller 150.

[0055] Optionally, the biosensing unit 111 is a millimeter-wave radar sensing module. The identification interface unit 112 is externally connected to the radar sensing module and communicates with the microcontroller 150 via a serial port (Universal Synchronous Asynchronous Receiver Transmitter, USART) to enable the microcontroller 150 to acquire the identification results from the radar sensing module. The identification results input to the microcontroller 150's serial port include the target biological status and distance auxiliary information. The antenna of this radar sensing module is aimed at the inside of the litter box. Using frequency-modulated continuous wave radar technology, it can accurately detect biological targets inside the litter box, identify their moving and stationary states, and calculate auxiliary information such as the target's distance.

[0056] In this embodiment, as Figure 3 As shown, the entry detection module 120 includes a second connector J2, a first transient suppression diode D1, a second transient suppression diode D2, an infrared emitting diode D4, a phototransistor D3, a third current-limiting resistor R3, a fourth current-limiting resistor R4, a fifth current-limiting resistor R5, and a second grounding capacitor C2. The first end of the second connector J2 is connected to the first end of the phototransistor D3, and the first end of the second connector J2 is also used for grounding (GND). The second end of the second connector J2 is connected to the second end of the phototransistor D3, the first end of the third current-limiting resistor R3, and the first end of the fourth current-limiting resistor R4, respectively. The second end of the third current-limiting resistor R3 is connected to the first end of the fifth current-limiting resistor R5. The third current-limiting resistor R3 and the fifth current-limiting resistor C2... The series connection of resistor R5 is connected to the power supply VCC. The second end of the fourth current-limiting resistor R4 is connected to the microcontroller 150 and the first end of the second grounding capacitor C2, respectively. The second end of the second grounding capacitor C2 is grounded to GND. The third end of the second connector J2 is connected to the first end of the first transient suppression diode D1, the first end of the infrared emitting diode D4, and the microcontroller 150, respectively. The second end of the fifth current-limiting resistor R5 is connected to the first end of the second transient suppression diode D2. The second ends of the first transient suppression diode D1 and the second transient suppression diode D2 are both grounded to GND. The fourth end of the second connector J2 is connected to the second end of the infrared emitting diode D4, and the series connection of the fifth current-limiting resistor R5 and the second transient suppression diode D2.

[0057] Specifically, the first transient suppression diode D1 and the second transient suppression diode D2 are bidirectional transient suppression diodes. The infrared emitting diode D4 and the phototransistor D3 are respectively positioned on both sides of the litter box entrance and are at the same horizontal level. When a living organism is present between the phototransistor D3 and the infrared emitting diode D4, the infrared light emitted by the infrared emitting diode D4 is blocked by the organism, preventing some or all of the light from reaching the phototransistor D3. This alters the conductivity of the phototransistor D3, affecting the output voltage signal. The voltage signal received by the microcontroller 150 will change to varying degrees. When the voltage signal drops to the software-set threshold, the microcontroller 150 determines that a living organism has entered or exited the litter box. The third terminal of the second connector J2 is connected to the software watchdog detection pin SW_YW_DET of the microcontroller 150, and the second terminal of the fourth current-limiting resistor R4 is connected to the analog input signal detection pin ADC_YW_DET of the microcontroller 150.

[0058] In this embodiment, the external detection module 130 includes a motion detection unit 131 and a motion detection interface unit 132. The first end of the motion detection interface unit 132 is connected to the motion detection unit 131, and the second end of the motion detection interface unit 132 is connected to the microcontroller 150. The motion detection unit 131 is used to sense the movement of organisms, and the motion detection interface unit 132 is used to transmit the detection results of the motion detection unit 131 to the microcontroller 150. Exemplary examples include... Figure 4 As shown, the motion detection interface unit 132 includes a third connector J3, a filter capacitor C3, and a sixth current-limiting resistor R6. The first end of the third connector J3 is connected to the power supply, and the second end of the third connector J3 is grounded (GND). The first end of the filter capacitor C3 is connected to the power supply VDD, and the second end of the filter capacitor C3 is grounded (GND). The third end of the third connector J3 is connected to the first end of the sixth current-limiting resistor R6, and the second end of the sixth current-limiting resistor R6 is connected to the microcontroller 150. Specifically, the second end of the sixth current-limiting resistor R6 is connected to the status detection pin DY_DET of the microcontroller 150.

[0059] Optionally, the motion detection unit 131 is a microwave radar sensor. The motion detection unit 131 is externally connected to a microwave radar sensor, which is installed at the lower edge of the litter box entrance. The antenna of the microwave radar sensor faces outward. When there is movement of a living being at the litter box entrance, the microwave radar sensor outputs a high level, indicating that a living being is approaching, and the litter box cleaning is paused. When there is no movement of a living being at the litter box entrance, the microwave radar sensor outputs a low level, indicating that no living being is approaching the litter box.

[0060] It's understandable that the entrance detection module 120 can only determine if a living being has entered the litter box, but it doesn't know if there are any living beings near the litter box. Since the litter box is turned upside down during cleaning, if the litter box continues cleaning even when a living being is near the entrance, it could pose a threat to the living being's safety. Therefore, an external detection module 130 is installed outside the litter box entrance to determine if a living being is near the entrance.

[0061] In this embodiment, the weight detection module 140 includes a gravity sensing unit 141 and a signal processing unit 142. The first end of the signal processing unit 142 is connected to the gravity sensing unit 141, and the second end of the signal processing unit 142 is connected to a microcontroller 150. The gravity sensing unit 141 measures the weight of the litter box and outputs a differential signal. The signal processing unit 142 amplifies the differential signal and converts it into voltage data, transmitting the voltage data to the microcontroller 150 so that the microcontroller 150 determines the weight change of the litter box based on the voltage data. (Exemplary, such as...) Figure 5 As shown, the gravity sensing unit 141 includes four resistance strain gauges and four fourth connectors, and the signal processing unit 142 includes an analog conversion chip U1 and peripheral circuits; the welding wires of the fourth connectors connect the resistance strain gauges in series.

[0062] Specifically, the welding wires of the four fourth connectors are respectively connected to four resistance strain gauges to form a bridge sensor. The four resistance strain gauges are respectively installed below the barrel. When the weight of the barrel changes, the differential signal is amplified and converted from analog to digital by the analog conversion chip U1. The analog conversion chip U1 transmits the voltage data to the microcontroller 150 through full-duplex synchronous communication (Serial Peripheral Interface, SPI).

[0063] This application also provides a smart litter box, exemplary of which includes a litter box body and a safety detection device 100 as described in the above embodiment. Specifically, the in-chamber detection module 110 is used to detect whether there are living organisms inside the chamber, and the out-of-chamber detection module 130 detects whether there are moving objects outside the chamber. The in-chamber detection module 110 and the out-of-chamber detection module 130 are installed at the following positions within the litter box: Figure 6 As shown, the detection angle range of the external detection module 130 is α, and the detection angle range of the internal detection module 110 is β. The installation position of the entrance detection module 120 at the litter box is as follows... Figure 7 As shown, the infrared emitting diode D4 and the phototransistor D3 are arranged opposite each other on both sides of the litter box inlet, and the weight detection module 140 is installed in the litter box as shown in the figure. Figure 8 As shown.

[0064] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A safety detection device for a cat litter box, characterized in that, include: The system includes an in-warehouse detection module, an entrance detection module, an external detection module, a weight detection module, and a microcontroller. The in-chamber detection module is installed inside the litter box, and the in-chamber detection module is used to detect whether there are any living organisms inside the litter box; The entrance detection module is located on both sides of the entrance of the litter box, and the entrance detection module is used to detect whether the organism has entered the box; The external detection module is installed outside the entrance of the litter box, and is used to detect whether there are any living organisms near the entrance of the litter box. The weight detection module is located at the bottom of the litter box, and the weight detection module is used to detect the weight of the litter box. The microcontroller is used to receive the detection results from the in-chamber detection module, the entrance detection module, the outside-chamber detection module, and the weight detection module, and to determine whether to put the litter box into cleaning mode based on the detection results; The in-warehouse detection module includes a biosensing unit and an identification interface unit. The first end of the identification interface unit is connected to the biosensing unit, and the second end of the identification interface unit is connected to the microcontroller. The biosensing unit is used to identify the presence and distance of the organism, and the identification interface unit is used to transmit the identification result of the biosensing unit to the microcontroller. The biosensing unit is a millimeter-wave radar sensing module, and the identification interface unit is connected to an external radar sensing module to communicate with the microcontroller via serial port. The identification interface unit includes a first connector, a first current-limiting resistor, a second current-limiting resistor, a first grounding capacitor, and an inductor; The first end of the first connector is connected to the first end of the first grounding capacitor and the first end of the inductor, respectively. The second end of the first grounding capacitor is grounded, the second end of the inductor is connected to the power supply, and the second end of the first connector is grounded. The third end of the first connector is connected to the first end of the first current-limiting resistor, the second end of the first current-limiting resistor is connected to the microcontroller, the fourth end of the first connector is connected to the first end of the second current-limiting resistor, and the second end of the second current-limiting resistor is connected to the microcontroller.

2. The safety detection device for a cat litter box according to claim 1, characterized in that, The inlet detection module includes a second connector, a first transient suppression diode, a second transient suppression diode, an infrared emitting diode, a phototransistor, a third current-limiting resistor, a fourth current-limiting resistor, a fifth current-limiting resistor, and a second grounding capacitor; The first end of the second connector is connected to the first end of the phototransistor, and the first end of the second connector is also used for grounding. The second end of the second connector is connected to the second end of the phototransistor, the first end of the third current-limiting resistor, and the first end of the fourth current-limiting resistor, respectively. The second end of the third current-limiting resistor is connected to the first end of the fifth current-limiting resistor, the series node of the third current-limiting resistor and the fifth current-limiting resistor is connected to the power supply, the second end of the fourth current-limiting resistor is connected to the microcontroller and the first end of the second grounding capacitor respectively, and the second end of the second grounding capacitor is grounded; The third end of the second connector is connected to the first end of the first transient suppression diode, the first end of the infrared emitting diode, and the microcontroller, respectively. The second end of the fifth current-limiting resistor is connected to the first end of the second transient suppression diode. The second ends of both the first transient suppression diode and the second transient suppression diode are grounded. The fourth end of the second connector is connected to the second end of the infrared emitting diode and the series node of the fifth current-limiting resistor and the second transient suppression diode.

3. The safety detection device for a cat litter box according to claim 1, characterized in that, The external detection module includes a motion detection unit and a motion detection interface unit. The first end of the motion detection interface unit is connected to the motion detection unit, and the second end of the motion detection interface unit is connected to the microcontroller. The motion detection unit is used to sense the movement of the organism, and the motion detection interface unit is used to transmit the detection results of the motion detection unit to the microcontroller.

4. The safety detection device for a cat litter box according to claim 3, characterized in that, The motion detection interface unit includes a third connector, a filter capacitor, and a sixth current-limiting resistor; The first end of the third connector is connected to the power supply, the second end of the third connector is grounded, the first end of the filter capacitor is connected to the power supply, the second end of the filter capacitor is grounded, the third end of the third connector is connected to the first end of the sixth current-limiting resistor, and the second end of the sixth current-limiting resistor is connected to the microcontroller.

5. The safety detection device for a cat litter box according to claim 1, characterized in that, The weight detection module includes a gravity sensing unit and a signal processing unit. The first end of the signal processing unit is connected to the gravity sensing unit, and the second end of the signal processing unit is connected to the microcontroller. The gravity sensing unit is used to measure the weight of the litter box and output a differential signal; The signal processing unit is used to amplify the differential signal and convert it from analog to digital to voltage data, and transmit the voltage data to the microcontroller so that the microcontroller can determine the weight change of the litter box based on the voltage data.

6. The safety detection device for a cat litter box according to claim 5, characterized in that, The gravity sensing unit includes four resistance strain gauges and four fourth connectors, and the signal processing unit includes an analog conversion chip and peripheral circuitry. The welding wire of the fourth connector connects the resistance strain gauges in series.

7. The safety detection device for a cat litter box according to claim 1, characterized in that, The microcontroller is specifically used to determine that the litter box has entered cleaning mode when the in-box detection module, the entrance detection module, and the outside-box detection module have not detected the organism, and the weight detection module has detected a change in the weight of the litter box. When at least one of the in-chamber detection module, the entrance detection module, and the outside-chamber detection module detects the organism, the litter box is determined to stop cleaning.

8. A smart cat litter box, characterized in that, It includes the litter box body and the safety detection device for the litter box as described in any one of claims 1-7.

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