Intelligent cat teasing device circuit

Abstract

The utility model discloses an intelligent cat teasing device circuit which comprises a control circuit, a motor driving circuit, a charging circuit, a battery protection circuit, an audio circuit, a booster circuit and a laser lamp circuit. The control circuit is connected with the battery, the motor drive circuit, the audio circuit and the laser lamp circuit. The laser lamp circuit is connected with the booster circuit. The battery is connected with the charging circuit and the battery protection circuit. The charging circuit is used for connecting the charging interface. The intelligent cat teasing device circuit provided by the utility model is diversified in function and long in service life.

Description

Technical Field

[0001] The utility model relates to the technical field of pet products, and more particularly to an intelligent cat teaser circuit. Background Art

[0002] In recent years, the number of pet owners has continued to grow, and with pet care needs becoming increasingly diverse and sophisticated, the pet toy market has entered a period of rapid development. Currently, cat teasers, which stimulate cats' hunting instincts and allow owners to interact with their beloved cats conveniently, have become a must-have tool for many cat owners, making playtime more enjoyable.

[0003] However, the cat teasers currently on the market often only have a laser point to tease the cat function, which is a single function. Moreover, after long-term use, the internal battery will be charged multiple times and its service life will be greatly shortened, resulting in a short product life of the cat teaser. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the utility model provides an intelligent cat teaser circuit with diverse functions and long service life.

[0005] The technical solution adopted by the utility model to solve its technical problems is: an intelligent cat teaser circuit, including a control circuit, a motor drive circuit, a charging circuit, a battery protection circuit, an audio circuit, a boost circuit and a laser light circuit; the control circuit is respectively connected to the battery, the motor drive circuit, the audio circuit and the laser light circuit, and the laser light circuit is connected to the boost circuit; the battery is respectively connected to the charging circuit and the battery protection circuit, and the charging circuit is used to connect to the charging interface.

[0006] In a preferred technical solution, the control circuit includes a control chip U1, a first pin of the control chip U1 is connected to the battery, a twentieth pin of the control chip U1 is grounded, and the first and twentieth pins of the control chip U1 are connected via a capacitor C6.

[0007] In a preferred technical solution, the motor drive circuit includes a first motor drive circuit and a second motor drive circuit;

[0008] The first motor driving circuit includes a first driving chip U4, a first motor driving port and a first stepper motor M1. The first driving chip U4 is connected to the first stepper motor M1 through the first motor driving port, and the first driving chip U4 is connected to the sixteenth pin to the nineteenth pin of the control chip U1.

[0009] The second motor driving circuit includes a second driving chip U5, a second motor driving port and a second stepper motor M2. The second driving chip U5 is connected to the second stepper motor M2 through the second motor driving port, and the second driving chip U5 is connected to the twelfth to fifteenth pins of the control chip U1.

[0010] In a preferred technical solution, the boost circuit includes a boost chip U6, an inductor L1 and a diode D1. The first pin of the boost chip U6 is respectively connected to one end of the inductor L1 and the anode of the diode D1; the other end of the inductor L1 is respectively connected to the fourth pin and the fifth pin of the boost chip U6, the battery and grounded through the capacitor C13; the cathode of the diode D1 is respectively connected to the output voltage end, one end of the capacitor C14 and one end of the resistor R18, the other end of the capacitor C14 is grounded, the other end of the resistor R18 is connected to the third pin of the boost chip U6 and one end of the resistor R19, and the other end of the resistor R19 is grounded.

[0011] In a preferred technical solution, the laser lamp circuit includes a laser lamp LD1 and a MOS transistor Q1; one end of the laser lamp LD1 is connected to the output voltage terminal, and the other end is connected to the drain of the MOS transistor Q1, the source of the MOS transistor Q1 is grounded, and the gate of the MOS transistor Q1 is connected to the eleventh pin of the control chip U1 through a resistor R20.

[0012] In a preferred technical solution, the audio circuit includes an audio chip U7 and a speaker; the second pin of the audio chip U7 is connected to the seventh pin of the control chip U1, the sixth pin and the eighth pin of the audio chip U7 are respectively connected to the two ends of the speaker, the seventh pin of the audio chip U7 is connected to the battery and grounded through the capacitor C15, and the fifth pin of the audio chip U7 is grounded.

[0013] In a preferred technical solution, the charging circuit includes a charging chip U3, a first light-emitting diode LED1 and a second light-emitting diode LED2, wherein the first light-emitting diode LED1 includes a red light-emitting diode and a green light-emitting diode;

[0014] The first pin of the charging chip U3 is connected to the fifth pin of the control chip U1. The third pin of the charging chip U3 is respectively connected to the battery, the anode of the red LED, the anode of the green LED, and one end of the resistor R8, and is grounded through a capacitor C4. The cathode of the red LED is connected to the fourth pin of the control chip U1 through a resistor R6, and the cathode of the green LED is connected to the third pin of the control chip U1 through a resistor R6. The other end of the resistor R8 is connected to the anode of the second LED LED LED2, and the cathode of the second LED LED LED2 is connected to the second pin of the control chip U1.

[0015] The fourth pin of the charging chip U3 is connected to one end of the resistor R1, the resistor R2, and the resistor R3 respectively. The other end of the resistor R1 is connected to the VBUS end of the charging interface, connected to the GND end of the charging interface through the capacitor C1, and grounded through the capacitor C2; the other end of the resistor R2 is grounded through the capacitor C3, and the other end of the resistor R3 is grounded through the resistor R4 and connected to the sixth pin of the control chip U1.

[0016] In a preferred technical solution, the battery protection circuit includes a battery protection chip U2; the second pin of the battery protection chip U2 is respectively connected to the negative electrode of the battery and one end of the capacitor C5, the positive electrode of the battery is connected to the other end of the capacitor C5 through the resistor R9, and is connected to the third pin of the battery protection chip U2; the fourth pin and the fifth pin of the battery protection chip U2 are grounded.

[0017] In a preferred technical solution, the intelligent cat teaser circuit further includes a key circuit, which is connected to the control circuit.

[0018] In a preferred technical solution, the key circuit includes keys S1, S2 and S3. One end of keys S1, S2 and S3 is grounded, and the other end is connected to the eighth pin to the tenth pin of the control chip U1.

[0019] It can be seen from the above technical solutions that, compared with the prior art, the beneficial effects of the present invention are: a smart cat teaser circuit can realize random or regular movement of the laser point through the motor drive circuit and the laser light circuit, thereby realizing the cat teasing function; and can realize the voice playback function through the audio circuit, with diverse functions and better cat teasing effect; at the same time, a battery protection circuit is provided, which can extend the battery life, thereby extending the service life of the smart cat teaser.

[0020] In addition, other advantages of the present invention will be given in the following description, and some will become apparent from the following description or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0022] Figure 1 This is a block diagram of the circuit structure of the intelligent cat teaser of the utility model;

[0023] Figure 2 This is a schematic diagram of the circuit structure of the control circuit of the utility model;

[0024] Figure 3 This is a schematic diagram of the circuit structure of the motor drive circuit of the utility model;

[0025] Figure 4 This is a schematic diagram of the circuit structure of the charging circuit of the utility model;

[0026] Figure 5 This is a schematic diagram of the circuit structure of the battery protection circuit of the utility model;

[0027] Figure 6 This is a schematic diagram of the circuit structure of the audio circuit of the utility model;

[0028] Figure 7 This is a schematic diagram of the circuit structure of the boost circuit of the utility model;

[0029] Figure 8 This is a schematic diagram of the circuit structure of the laser light circuit of the utility model;

[0030] Figure 9 This is a schematic diagram of the circuit structure of the key circuit of the utility model. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0033] Reference Figure 1-9 An intelligent cat teaser circuit according to an embodiment of the present invention is described, which can be used in intelligent cat teaser products to achieve laser point teasing of cats.

[0034] In one embodiment, Figure 1-9 As shown, an intelligent cat teaser circuit includes a control circuit, a motor drive circuit, a charging circuit, a battery protection circuit, an audio circuit, a boost circuit and a laser light circuit; the control circuit is respectively connected to the battery, the motor drive circuit, the audio circuit and the laser light circuit, and the laser light circuit is connected to the boost circuit; the battery is respectively connected to the charging circuit and the battery protection circuit, and the charging circuit is used to connect to the charging interface.

[0035] Among them, the control circuit is used to complete the control of all functions, such as button detection, motor control drive, voice function control and laser light operation control; the motor drive circuit is used to control the operation of the stepper motor, which can drive the laser light to move, thereby generating a moving laser point to realize the cat-amusing function; the charging circuit is connected to the charging interface to the outside, used to charge the battery and indicate the charging status, for example: a red light is on when charging, and a green light is on when charging is complete; the battery protection circuit is used to prevent the battery from overcharging and can extend the battery life; the audio circuit is connected to a speaker for voice broadcast function; the boost circuit is connected to the battery, used to convert the battery voltage into a stable 5V voltage for use in the laser light; the laser light circuit is provided with a laser light, which can be used to generate a laser light spot, driven by a stepper motor, thereby realizing the function of arbitrary movement of the point.

[0036] In a specific implementation, the battery may be a rechargeable lithium battery, and the charging interface may be a Type-C interface.

[0037] The above embodiment provides an intelligent cat teaser circuit, which can realize random or regular movement of the laser point through the motor drive circuit and the laser light circuit to realize the cat teasing function; and can realize the voice playback function through the audio circuit, with diverse functions and better cat teasing effect; at the same time, a battery protection circuit is provided to extend the battery life.

[0038] In this embodiment, the control circuit includes a control chip U1, the first pin of the control chip U1 is connected to the battery, the twentieth pin of the control chip U1 is grounded, and the first pin and the twentieth pin of the control chip U1 are connected through a capacitor C6 to form a filtering circuit of the control chip U1 to ensure stable operation of the system and cope with power supply fluctuations.

[0039] In this embodiment, the motor driving circuit includes a first motor driving circuit and a second motor driving circuit.

[0040] The first motor drive circuit includes a first drive chip U4, a capacitor C7, a capacitor C8, a capacitor C9, a resistor R10, a resistor R11, a resistor R12, a first motor drive port and a first stepper motor M1. The first drive chip U4 is connected to the first stepper motor M1 through the first motor drive port, and the first drive chip U4 is connected to the sixteenth pin to the nineteenth pin of the control chip U1.

[0041] During specific implementation, the first pin of the first driver chip U4 is connected to the battery through a resistor R10, the second pin of the first driver chip U4 is connected to the fourth pin of the first motor drive port through a resistor R11, the fourth pin and the fifth pin of the first driver chip U4 are respectively connected to the third pin and the second pin of the first motor drive port, the seventh pin of the first driver chip U4 is connected to the first pin of the first motor drive port through a resistor R12, and the first motor drive port is connected to the first stepper motor M1; the eleventh pin of the first driver chip U4 is connected to the battery through a capacitor C9, the twelfth pin of the first driver chip U4 is connected to the battery and grounded through a capacitor C8, the thirteenth pin of the first driver chip U4 is grounded, and the fourteenth pin of the first driver chip U4 is grounded through a capacitor C7; the ninth pin, the tenth pin, the fifteenth pin and the sixteenth pin of the first driver chip U4 are respectively connected to the seventeenth pin, the sixteenth pin, the eighteenth pin and the nineteenth pin of the control chip U1.

[0042] The second motor drive circuit includes a second drive chip U5, a capacitor C10, a capacitor C11, a capacitor C12, a resistor R14, a resistor R15, a resistor R16, a second motor drive port and a second stepper motor M2. The second drive chip U5 is connected to the second stepper motor M2 through the second motor drive port, and the second drive chip U5 is connected to the twelfth pin to the fifteenth pin of the control chip U1.

[0043] During specific implementation, the first pin of the second driver chip U5 is connected to the battery through a resistor R14, the second pin of the second driver chip U5 is connected to the fourth pin of the second motor drive port through a resistor R15, the fourth pin and the fifth pin of the second driver chip U5 are respectively connected to the third pin and the second pin of the second motor drive port, the seventh pin of the second driver chip U5 is connected to the first pin of the second motor drive port through a resistor R16, and the second motor drive port is connected to the second stepper motor M2; the eleventh pin of the second driver chip U5 is connected to the battery through a capacitor C12, the twelfth pin of the second driver chip U5 is connected to the battery and grounded through a capacitor C11, the thirteenth pin of the second driver chip U5 is grounded, and the fourteenth pin of the second driver chip U5 is grounded through a capacitor C10; the ninth pin, the tenth pin, the fifteenth pin and the sixteenth pin of the second driver chip U4 are respectively connected to the thirteenth pin, the twelfth pin, the fourteenth pin and the fifteenth pin of the control chip U1.

[0044] The third pin and the sixth pin of the first driver chip U4 and the second driver chip U5 are both grounded.

[0045] In this embodiment, the boost circuit includes a boost chip U6 , an inductor L1 , a diode D1 , a capacitor C13 , a capacitor C14 , a resistor R18 , and a resistor R19 .

[0046] The first pin of the boost chip U6 is respectively connected to one end of the inductor L1 and the anode of the diode D1; the other end of the inductor L1 is respectively connected to the fourth and fifth pins of the boost chip U6, the battery and grounded through the capacitor C13; the cathode of the diode D1 is respectively connected to the output voltage terminal, one end of the capacitor C14 and one end of the resistor R18, the other end of the capacitor C14 is grounded, the other end of the resistor R18 is connected to the third pin of the boost chip U6 and one end of the resistor R19, and the other end of the resistor R19 is grounded.

[0047] The second pin of the boost chip U6 is grounded, and the output voltage terminal can be 5V to power the laser light circuit. In specific implementation, the boost circuit is used to convert the battery voltage into a stable 5V voltage for use by the laser light.

[0048] In this embodiment, the laser lamp circuit includes a laser lamp LD1, a MOS tube Q1 and a resistor R20;

[0049] One end of the laser lamp LD1 is connected to the output voltage end, and the other end is connected to the drain of the MOS transistor Q1. The source of the MOS transistor Q1 is grounded, and the gate of the MOS transistor Q1 is connected to the eleventh pin (LD1) of the control chip U1 through the resistor R20.

[0050] In this embodiment, the audio circuit includes an audio chip U7, a speaker SP, and a capacitor C15.

[0051] The second pin of the audio chip U7 is connected to the seventh pin (SP) of the control chip U1, the sixth pin and the eighth pin of the audio chip U7 are respectively connected to the two ends of the speaker SP, the seventh pin of the audio chip U7 is connected to the battery and grounded through the capacitor C15, and the fifth pin of the audio chip U7 is grounded.

[0052] The intelligent cat-amusing circuit in the above embodiment can control the speaker to play different sounds through the audio circuit, which can enhance the cat's interest in playing and enhance the cat-amusing effect.

[0053] In this embodiment, the charging circuit includes a charging chip U3, a first light emitting diode LED1, a second light emitting diode LED2, capacitors C1-C4, and resistors R1-R8. The first light emitting diode LED1 includes a red light emitting diode and a green light emitting diode.

[0054] A first pin of the charging chip U3 is connected to a fifth pin (CHG-OK) of the control chip U1 , a second pin of the charging chip U3 is grounded, and a fifth pin of the charging chip U3 is grounded via a resistor R5 .

[0055] The third pin of the charging chip U3 is respectively connected to the battery, the anode of the red LED, the anode of the green LED, and one end of the resistor R8, and is grounded through a capacitor C4. The cathode of the red LED is connected to the fourth pin (LED-R) of the control chip U1 through a resistor R6, and the cathode of the green LED is connected to the third pin (LED-G) of the control chip U1 through a resistor R6; the other end of the resistor R8 is connected to the anode of the second LED LED LED2, and the cathode of the second LED LED LED2 is connected to the second pin (LED2) of the control chip U1.

[0056] The fourth pin of the charging chip U3 is connected to one end of resistors R1, R2, and R3, respectively. The other end of resistor R1 is connected to the VBUS end of the charging interface, connected to the GND end of the charging interface through capacitor C1, and grounded through capacitor C2; the other end of resistor R2 is grounded through capacitor C3, and the other end of resistor R3 is grounded through resistor R4 and connected to the sixth pin (CHG-IN) of the control chip U1.

[0057] In this embodiment, the battery protection circuit includes a battery protection chip U2. The second pin of the battery protection chip U2 is respectively connected to the negative electrode of the battery and one end of the capacitor C5. The positive electrode of the battery is connected to the other end of the capacitor C5 through the resistor R9 and is connected to the third pin of the battery protection chip U2. The fourth and fifth pins of the battery protection chip U2 are grounded.

[0058] In the above embodiment, the battery protection chip U2 can prevent the battery from being overcharged and over-discharged, extend the battery life, and monitor the battery status.

[0059] In this embodiment, the intelligent cat teaser circuit further includes a key circuit, which is connected to the control circuit.

[0060] The key circuit is used for users to set parameters such as working mode and stepper motor speed. The control circuit can control the motor drive circuit and laser light circuit according to the key instructions input by the user to realize the laser cat teasing function.

[0061] The intelligent cat teaser circuit provided in this embodiment also includes a key circuit, which can realize different working mode adjustment, parameter setting and other functions through keys, and is easy to use.

[0062] In a specific implementation, the key circuit may include keys S1, S2 and S3. One end of each of the keys S1, S2 and S3 is grounded, and the other end is connected to the eighth to tenth pins (KEY1-KEY3) of the control chip U1.

[0063] The above-mentioned key circuit only includes three keys, and these three keys are directly connected to three different pins of the control chip U1. The circuit structure is simple, which reduces costs and facilitates subsequent maintenance and replacement of the product.

[0064] Other structures and operations of the intelligent cat teaser circuit according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0065] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0066] In the description of this specification, the reference terms "embodiment", "specific embodiment", "example", etc. mean that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention.

[0067] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined with each other in any suitable manner in any one or more embodiments or examples without interference or contradiction.

Claims

1. An intelligent cat teaser circuit, characterized in that: Including control circuit, motor drive circuit, charging circuit, battery protection circuit, audio circuit, boost circuit and laser light circuit; The control circuit is respectively connected to the battery, the motor drive circuit, the audio circuit and the laser light circuit, and the laser light circuit is connected to the boost circuit; The battery is connected to the charging circuit and the battery protection circuit respectively, and the charging circuit is used to connect to a charging interface.

2. The intelligent cat teaser circuit according to claim 1, characterized in that: The control circuit includes a control chip U1 , a first pin of the control chip U1 is connected to the battery, a twentieth pin of the control chip U1 is grounded, and the first pin and the twentieth pin of the control chip U1 are connected via a capacitor C6 .

3. The intelligent cat teaser circuit according to claim 2, characterized in that: The motor drive circuit includes a first motor drive circuit and a second motor drive circuit; The first motor drive circuit includes a first drive chip U4, a first motor drive port and a first stepper motor M1. The first drive chip U4 is connected to the first stepper motor M1 through the first motor drive port, and the first drive chip U4 is connected to the sixteenth pin to the nineteenth pin of the control chip U1. The second motor driving circuit includes a second driving chip U5, a second motor driving port and a second stepper motor M2. The second driving chip U5 is connected to the second stepper motor M2 through the second motor driving port, and the second driving chip U5 is connected to the twelfth to fifteenth pins of the control chip U1.

4. The intelligent cat teaser circuit according to claim 2, wherein: The boost circuit includes a boost chip U6, an inductor L1 and a diode D1. The first pin of the boost chip U6 is respectively connected to one end of the inductor L1 and the anode of the diode D1; the other end of the inductor L1 is respectively connected to the fourth pin and the fifth pin of the boost chip U6, the battery and grounded through the capacitor C13; the cathode of the diode D1 is respectively connected to the output voltage end, one end of the capacitor C14 and one end of the resistor R18, the other end of the capacitor C14 is grounded, the other end of the resistor R18 is connected to the third pin of the boost chip U6 and one end of the resistor R19, and the other end of the resistor R19 is grounded.

5. The intelligent cat teaser circuit according to claim 4, characterized in that: The laser lamp circuit includes a laser lamp LD1 and a MOS tube Q1; One end of the laser lamp LD1 is connected to the output voltage end, and the other end is connected to the drain of the MOS transistor Q1. The source of the MOS transistor Q1 is grounded, and the gate of the MOS transistor Q1 is connected to the eleventh pin of the control chip U1 through a resistor R20.

6. The intelligent cat teaser circuit according to claim 2, characterized in that: The audio circuit includes an audio chip U7 and a speaker; The second pin of the audio chip U7 is connected to the seventh pin of the control chip U1, the sixth pin and the eighth pin of the audio chip U7 are respectively connected to the two ends of the speaker, the seventh pin of the audio chip U7 is connected to the battery and grounded through the capacitor C15, and the fifth pin of the audio chip U7 is grounded.

7. The intelligent cat teaser circuit according to claim 2, characterized in that: The charging circuit includes a charging chip U3, a first light-emitting diode LED1 and a second light-emitting diode LED2, wherein the first light-emitting diode LED1 includes a red light-emitting diode and a green light-emitting diode; The first pin of the charging chip U3 is connected to the fifth pin of the control chip U1. The third pin of the charging chip U3 is respectively connected to the battery, the anode of the red LED, the anode of the green LED, and one end of the resistor R8, and is grounded through a capacitor C4. The cathode of the red LED is connected to the fourth pin of the control chip U1 through a resistor R6, and the cathode of the green LED is connected to the third pin of the control chip U1 through a resistor R6. The other end of the resistor R8 is connected to the anode of the second LED LED2, and the cathode of the second LED LED2 is connected to the second pin of the control chip U1. The fourth pin of the charging chip U3 is connected to one end of the resistor R1, the resistor R2, and the resistor R3 respectively. The other end of the resistor R1 is connected to the VBUS end of the charging interface, connected to the GND end of the charging interface through the capacitor C1, and grounded through the capacitor C2; the other end of the resistor R2 is grounded through the capacitor C3, and the other end of the resistor R3 is grounded through the resistor R4 and connected to the sixth pin of the control chip U1.

8. The intelligent cat teaser circuit according to claim 7, characterized in that: The battery protection circuit includes a battery protection chip U2; The second pin of the battery protection chip U2 is connected to the negative electrode of the battery and one end of the capacitor C5 respectively. The positive electrode of the battery is connected to the other end of the capacitor C5 through the resistor R9 and is connected to the third pin of the battery protection chip U2. The fourth and fifth pins of the battery protection chip U2 are grounded.

9. The intelligent cat teaser circuit according to any one of claims 2 to 8, characterized in that: The intelligent cat teaser circuit further includes a key circuit, which is connected to the control circuit.

10. The intelligent cat teaser circuit according to claim 9, characterized in that: The key circuit includes a key S1 , a key S2 and a key S3 . One end of the key S1 , the key S2 and the key S3 is grounded, and the other end is connected to the eighth pin to the tenth pin of the control chip U1 .

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