Intelligent wireless doorbell capable of improving anti-interference capability

Abstract

The utility model provides an intelligent wireless doorbell capable of improving anti-interference capability, and belongs to the technical field of doorbells. The intelligent wireless doorbell comprises a doorbell outdoor unit and a doorbell indoor unit, the doorbell outdoor unit is provided with a first MCU and a first 433MHz wireless module connected with the first MCU, the doorbell indoor unit is provided with a second MCU, a loudspeaker and a second 433MHz wireless module, the loudspeaker and the second 433MHz wireless module are respectively connected with the second MCU, and the first 433MHz wireless module and the second 433MHz wireless module are respectively connected with the second MCU. The doorbell outdoor unit and the doorbell indoor unit are in wireless connection through the first 433MHz wireless module and the second 433MHz wireless module. The utility model has the beneficial effects that the anti-interference capability is improved, the standing-wave ratio performance is good, the installation is convenient, and the performance is stable.

Description

Technical Field

[0001] The utility model relates to a wireless doorbell, in particular to an intelligent wireless doorbell with improved anti-interference capability. Background Art

[0002] With the development of wireless technology, various wireless technologies such as GSM, GPS, WLAN, Bluetooth, etc. are widely used and popularized in daily life. When applied to various electronic devices, electromagnetic interference and electromagnetic compatibility issues must also be considered to avoid interference with related functions and generate distorted signals.

[0003] The common electromagnetic radiation interference in living environment are mainly the following: AM broadcasting: 300kHz~3000kHz, FM broadcasting: 30MHz~300MHz, mobile cellular network: 904MHz~960MHz, 1.88GHz~1.9GHz, 2.01GHz~2.025GHz, 2.32GHz~2.37Ghz, 2.575GHz~2.635GHz, 3.3GHz~3.6GHz, 4.8GHz~5GHz, wireless Ethernet (Wi-Fi) 2.4G frequency band, (Wi-Fi) 5G frequency band, Bluetooth: 2.412GHz~2.484GHz, 4.915GHz~5.825GHz, microwave oven frequency band: 2.45GHz.

[0004] Currently, wireless doorbells with surveillance cameras generally use WIFI and mobile cellular networks for transmission, while doorbells use wireless signals such as Bluetooth for transmission. Therefore, more different wireless modules and antennas need to be placed in an extremely small shell. These components are bound to be more likely to generate noise interference with each other, thus affecting their transmission performance. Utility Model Content

[0005] In order to solve the problems of electromagnetic interference and electromagnetic compatibility in the prior art, the utility model provides an intelligent wireless doorbell with improved anti-interference capability.

[0006] The utility model discloses an intelligent wireless doorbell with improved anti-interference capability, comprising a doorbell outdoor unit and a doorbell indoor unit, wherein the doorbell outdoor unit is provided with a first MCU and a first 433 MHz wireless module connected to the first MCU, the doorbell indoor unit is provided with a second MCU, a loudspeaker and a second 433 MHz wireless module respectively connected to the second MCU, and the doorbell outdoor unit and the doorbell indoor unit are wirelessly connected via the first 433 MHz wireless module and the second 433 MHz wireless module.

[0007] Furthermore, the doorbell indoor unit also includes a wireless receiving module connected to the second MCU, the wireless receiving module is provided with a third antenna, the signal of the first 433MHz wireless module is received through the third antenna, and the output end is used to output a wake-up sleep signal to the second MCU.

[0008] Furthermore, the doorbell outdoor unit is also provided with a human body sensing module and a human-computer interaction module, wherein the human body sensing module is used to detect persons outside the door, and the human-computer interaction module is used for persons outside the door to interact with the doorbell outdoor unit.

[0009] Furthermore, the human-computer interaction module includes a speaker, a button and / or a microphone.

[0010] Furthermore, it also includes a camera module and a WIFI wireless module arranged in the doorbell outdoor unit, the input end of the camera module is connected to the output end of the human body sensing module, and the output end of the camera module is connected to the input end of the WIFI wireless module.

[0011] Furthermore, it also includes a light detection sensor connected to the input end of the camera module.

[0012] Furthermore, the first 433MHz wireless module is a wireless transmission module, including a wireless transmission chip U1700, a first antenna matching network, a first crystal oscillator and a first antenna. Pin 1 of the wireless transmission chip U1700 is connected to the first crystal oscillator, pin 3 is connected to the first MCU for communicating with the first MCU, and pin 5 is connected to the first antenna through the first antenna matching network.

[0013] Furthermore, the wireless transmitting chip U1700 adopts a CMT2119A transmitting chip, and the first antenna matching network includes a capacitor C1702, a capacitor C1703, a capacitor C1704, an inductor L1701, and an inductor L1702, wherein the capacitor C1702, the inductor L1701, and the inductor L1702 are connected in series in sequence and connected to the first antenna, one end of the capacitor C1703 and the capacitor C1704 are grounded, and the other ends are respectively connected to the two ends of the inductor L1702.

[0014] Furthermore, the second 433MHz wireless module is a wireless receiving module, including a wireless receiving chip U102, a second antenna matching network, a second crystal oscillator and a second antenna, pins 7 and 8 of the wireless receiving chip U102 are connected to the second crystal oscillator, pin 14 is connected to the second antenna through the second antenna matching network, pins 1-4 are SPI interfaces connected to the second MCU, and pins 5-6 and 9-10 are GPIO interfaces connected to the second MCU.

[0015] Furthermore, the wireless receiving chip U102 adopts a CMT2219A receiving chip, and the second antenna matching network includes a capacitor C106, an inductor L101, an inductor L102 and a resistor R106, wherein the capacitor C106 and the resistor R106 are connected in series, and one end is connected to the second antenna, one end of the inductor L101 and the inductor L102 is grounded, and the other end is respectively connected to the two ends of the capacitor C106.

[0016] Compared with the prior art, the utility model has the following beneficial effects: good standing wave ratio performance, convenient installation and stable performance;

[0017] By setting the communication module of the doorbell outdoor unit and the doorbell indoor unit to a 433MHz wireless module, the frequency band does not overlap with the commonly used wireless networks, such as FM broadcasting, mobile networks, Bluetooth, microwave ovens, etc., so that electromagnetic interference with other wireless networks can be effectively avoided. The antennas of other networks can be set up in the narrow space of the smart wireless doorbell, reducing the difficulty of antenna layout. In the process of signal transmission, interference from other signals can also be avoided, thereby greatly improving the anti-interference ability and electromagnetic compatibility performance;

[0018] By integrating a camera module and a human body sensing module in the smart wireless doorbell, a moving object is detected, image sampling is completed through the camera, and the first 433MHz wireless module is used to complete the transmission through encoding with the second 433MHz wireless module installed in the indoor unit. The user can connect to the device through the mobile phone WIFI, perform real-time operations and view the situation outside the door on the mobile phone. If no one is indoors and there are suspicious people moving outdoors, the user can also connect to the device through the mobile phone to operate, and the mobile phone intercom transmits the sound to the outdoor unit speaker to warn the nearby people. The utility model starts the doorbell outdoor unit only after sensing a moving object or a person, thereby reducing power consumption and achieving low-power operation;

[0019] By additionally setting up a wireless receiving module with higher sensitivity, after receiving the signal, the dormant second MCU is awakened and starts working, thereby further reducing power consumption and realizing long-distance signal transmission, making the installation location of the doorbell indoor unit of the utility model more flexible and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1This is the structural block diagram of the doorbell outdoor unit of the utility model;

[0022] Figure 2 This is the structural block diagram of the doorbell indoor unit of the utility model;

[0023] Figure 3 This is a circuit diagram of an embodiment of a WIFI wireless module;

[0024] Figure 4 This is a circuit diagram of a first MCU embodiment;

[0025] Figure 5 This is a circuit diagram of an embodiment of a first 433MHz wireless module;

[0026] Figure 6 This is a circuit schematic diagram of a second MCU embodiment;

[0027] Figure 7 This is a circuit schematic diagram of an embodiment of a second 433 MHz wireless module;

[0028] Figure 8 This is a circuit schematic diagram of an embodiment of a wireless receiving module. DETAILED DESCRIPTION

[0029] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0030] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present invention may be combined with other embodiments.

[0031] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0032] like Figure 1 and Figure 2As shown, the utility model has improved anti-interference ability of the smart wireless doorbell, including a doorbell outdoor unit (referred to as the outdoor unit) and a doorbell indoor unit (referred to as the indoor unit), wherein the doorbell outdoor unit is provided with a first MCU and a first 433MHz wireless module connected to the first MCU, and the doorbell indoor unit is provided with a second MCU, a speaker and a second 433MHz wireless module respectively connected to the second MCU, and the doorbell outdoor unit and the doorbell indoor unit are wirelessly connected via the first 433MHz wireless module and the second 433MHz wireless module.

[0033] The utility model sets the communication modules of the doorbell outdoor unit and the doorbell indoor unit to 433MHz wireless modules, so that the frequency bands do not overlap with the currently commonly used wireless networks, such as FM broadcasting, mobile networks, Bluetooth, microwave ovens, etc., thereby effectively avoiding electromagnetic interference with other wireless networks, and can well set antennas of other networks in the narrow space of the smart wireless doorbell, reducing the difficulty of antenna layout, and can also avoid interference from other signals during signal transmission, thereby greatly improving the anti-interference ability and electromagnetic compatibility performance.

[0034] The doorbell outdoor unit of the smart wireless doorbell in this example also integrates a camera module, and the doorbell outdoor unit is also provided with a human body sensing module and a human-computer interaction module. The human body sensing module is used to detect people outside the door, and the human-computer interaction module is used for people outside the door to interact with the doorbell outdoor unit. The human body sensing module in this example adopts an infrared sensor, and the human-computer interaction module in this example is a button, a speaker and a microphone.

[0035] Specifically, an infrared sensor is installed on the shell of the outdoor doorbell machine in this example, a camera is installed below the infrared sensor, a microphone is installed on the front panel of the doorbell, and a speaker is installed on the side, and human-computer interaction is completed through key actions.

[0036] The outdoor unit of the doorbell in this example is installed outside the door. It has an infrared function to monitor moving objects, complete image sampling through the camera module, and complete transmission using the first 433MHz wireless module and the second 433MHz wireless module. Users can connect to the smart wireless doorbell of this utility model through the mobile phone WIFI, and perform real-time operations and view the situation outside the door on the mobile phone. At the same time, when the visitor presses the button, the indoor unit receives the signal, and the speaker will play the pre-selected ringtone to remind the people indoors that someone is visiting. If no one is indoors and there are suspicious people moving outdoors, the user can also operate through the mobile phone connection, and the mobile phone intercom will transmit the sound to the outdoor unit speaker to warn the people nearby. The utility model starts the outdoor unit of the doorbell only after sensing a moving object or person, thereby reducing power consumption and achieving low-power operation.

[0037] Preferably, the indoor unit of this example is also provided with a wireless receiving module for receiving a first 433MHz wireless module signal. The sensitivity of the wireless receiving module is higher than that of the second 433MHz wireless module. When the first 433MHz wireless module signal is received, the dormant second MCU is awakened. After receiving the signal through the additionally set wireless receiving module with higher sensitivity, the dormant second MCU is awakened and starts working, thereby further reducing power consumption and realizing long-distance signal transmission, making the installation position of the doorbell indoor unit of the utility model more flexible and convenient.

[0038] The camera module in this example preferably uses a HiSilicon camera module that supports light detection. It can automatically adjust to day or night mode according to light changes, so that visitors can be identified more clearly.

[0039] like Figure 3 and Figure 4 As shown, the WIFI wireless module in this example uses the DXS-S1031_H31S wireless chip U44, and the first MCU U1500 pin 22 in this example is connected to the first 433MHz wireless module. According to the light changes, the data is transmitted to the first MCU U1500 through the human body pyroelectric infrared sensing control chip, and the data is output to the second 433MHz wireless module of the indoor unit through pin 22, and the reminder operation is performed through the indoor unit's speaker voice broadcast. After the outdoor unit is paired with the WIFI connection, the user can also connect through a mobile phone.

[0040] The WIFI function of the outdoor unit is mainly realized by the DXS-S1031_H31S wireless chip U44. The main chip of the WIFI wireless module is Hi1131S, which supports 20 / 40MHz bandwidth. The WLAN baseband can realize orthogonal frequency division multiplexing (OFDM) and is backward compatible with direct sequence spread spectrum (DSSS) and complementary code keying (CCK). It can also perform RF self-calibration and adjust and correct its performance in real time. In different environments and working conditions, it ensures signal stability, reduces communication interruptions and bit error rates, maintains optimal performance, and provides a better user experience.

[0041] like Figure 5 As shown, the first 433MHz wireless module is a wireless transmission module, including a wireless transmission chip U1700, a first antenna matching network, a first crystal oscillator and a first antenna. Pin 1 of the wireless transmission chip U1700 is connected to the first crystal oscillator, pin 3 is connected to the first MCU for communicating with the first MCU, and pin 5 is connected to the first antenna through the first antenna matching network.

[0042] In addition, the first 433MHz wireless module of the utility model also reserves a level conversion unit, which includes switch tubes Q1701 and Q1702, which are respectively connected in series to the data pin 3 and the clock pin 4 of the wireless transmitting chip U1700 connected to the first MCU. The gates of the switch tubes Q1701 and Q1702 are respectively connected to the 1.8V power supply. After the first MCU is powered on, the level conversion operation can be performed.

[0043] In this example, the wireless transmitting chip U1700 adopts the CMT2119A transmitting chip. The first antenna matching network includes capacitor C1702, capacitor C1703, capacitor C1704, inductor L1701, and inductor L1702. The capacitor C1702, inductor L1701, and inductor L1702 are sequentially connected in series and connected to the first antenna. One end of the capacitor C1703 and the capacitor C1704 are grounded, and the other ends are respectively connected to the two ends of the inductor L1702.

[0044] In this example, a π-type antenna matching network is reserved between the first antenna ANT1700 and the module. The antenna matching network is less than 5 mm away from the module, and the routing impedance is controlled to be 50 ohms.

[0045] like Figure 6 and Figure 7 As shown, the second 433MHz wireless module in this example is a wireless receiving module, including a wireless receiving chip U102, a second antenna matching network, a second crystal oscillator and a second antenna. Pins 7 and 8 of the wireless receiving chip U102 are connected to the second crystal oscillator, pin 14 is connected to the second antenna through the second antenna matching network, pins 1-4 are SPI interfaces connected to the second MCU, and pins 5-6 and 9-10 are GPIO interfaces connected to the second MCU.

[0046] In this example, the wireless receiving chip U102 adopts the CMT2219A receiving chip, and the second antenna matching network includes a capacitor C106, an inductor L101, an inductor L102 and a resistor R106, wherein the capacitor C106 and the resistor R106 are connected in series, and one end is connected to the second antenna, and one end of the inductor L101 and the inductor L102 is grounded, and the other ends are respectively connected to the two ends of the capacitor C106.

[0047] This example works like this:

[0048] The U1700 in the outdoor unit uses CMT2119A, which is suitable for 240 to 960MHz wireless applications. The first MCU transmits data to the CMT2119A receiving chip via DATA / CLK. The input data will be modulated by the efficient PA (integrated inside the CMT2119A chip) and sent. When a valid level transition is detected on the DATA pin of U1700, the first MCU U1500 starts transmission, and the transmission action will stop after the DATA pin remains at a low level for a defined time or after a two-wire interface (TWI) command is issued. The CMT2119A transmitter and the CMT2219A receiver together realize a robust RF link.

[0049] The wireless receiving chip U102 in the indoor unit uses CMT2219A, which is suitable for 300 to 960MHz wireless applications. The antenna receives the RF signal sent by the outdoor unit, amplifies, converts, filters, simulates, and amplifies it, and then sends it to the digital demodulator (the signal processing function is integrated inside the CMT2219A chip). The second MCU U101 SC92F7003 microcontroller is connected to the wireless receiving chip U102 through a 4-wire SPI interface and configured to configure the required RF frequency and transmission rate, etc.

[0050] Since 433MHz wireless technology operates in the ultra-high frequency band, the wavelength of this frequency band is shorter, the penetration is strong, and it has strong anti-interference ability, which can ensure the stability of communication and does not conflict with other frequencies in the common electromagnetic radiation environment in life. The strong penetration also ensures that the indoor unit installed outside the door can complete communication with the paired indoor unit inside the door.

[0051] like Figure 8 As shown, the wireless receiving module in this example adopts a receiving chip U300 with greater sensitivity and receiving distance, and receives the signal of the first 433MHz wireless module through the third antenna ANT2. Usually, the indoor unit is in sleep mode. After the receiving chip U300 receives the signal, it transmits it to the second MCU through pin 5 to wake up the indoor unit to receive data, thereby achieving ultra-low standby power consumption, making the utility model more power-saving and energy-saving.

[0052] The specific implementation modes described above are preferred implementation modes of the present utility model, and are not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to the specific implementation modes, and all equivalent changes made in accordance with the present utility model are within the protection scope of the present utility model.

Claims

1. An intelligent wireless doorbell with improved anti-interference capability, characterized in that: The invention comprises a doorbell outdoor unit and a doorbell indoor unit, wherein the doorbell outdoor unit is provided with a first MCU and a first 433 MHz wireless module connected to the first MCU, and the doorbell indoor unit is provided with a second MCU, a speaker connected to the second MCU respectively, and a second 433 MHz wireless module, and the doorbell outdoor unit and the doorbell indoor unit are wirelessly connected via the first 433 MHz wireless module and the second 433 MHz wireless module.

2. The intelligent wireless doorbell with improved anti-interference capability according to claim 1, characterized in that: The doorbell indoor unit also includes a wireless receiving module connected to the second MCU. The wireless receiving module is provided with a third antenna. The signal of the first 433MHz wireless module is received through the third antenna. The output end is used to output a wake-up sleep signal to the second MCU.

3. The intelligent wireless doorbell with improved anti-interference capability according to claim 1, characterized in that: The doorbell outdoor unit is also provided with a human body sensing module and a human-computer interaction module. The human body sensing module is used to detect people outside the door, and the human-computer interaction module is used for the people outside the door to interact with the doorbell outdoor unit.

4. The intelligent wireless doorbell with improved anti-interference capability according to claim 3, characterized in that: The human-computer interaction module includes a speaker, a button and / or a microphone.

5. The intelligent wireless doorbell with improved anti-interference capability according to claim 3, characterized in that: It also includes a camera module and a WIFI wireless module arranged in the doorbell outdoor unit, the input end of the camera module is connected to the output end of the human body sensing module, and the output end of the camera module is connected to the input end of the WIFI wireless module.

6. The intelligent wireless doorbell with improved anti-interference capability according to claim 5, characterized in that: It also includes a light detection sensor connected to the input end of the camera module.

7. The intelligent wireless doorbell with improved anti-interference capability according to any one of claims 1 to 5, characterized in that: The first 433MHz wireless module is a wireless transmission module, including a wireless transmission chip U1700, a first antenna matching network, a first crystal oscillator and a first antenna. Pin 1 of the wireless transmission chip U1700 is connected to the first crystal oscillator, pin 3 is connected to the first MCU for communicating with the first MCU, and pin 5 is connected to the first antenna through the first antenna matching network.

8. The intelligent wireless doorbell with improved anti-interference capability according to claim 7, characterized in that: The wireless transmitting chip U1700 adopts the CMT2119A transmitting chip, and the first antenna matching network includes capacitor C1702, capacitor C1703, capacitor C1704, inductor L1701, and inductor L1702, wherein the capacitor C1702, inductor L1701, and inductor L1702 are connected in series in sequence and connected to the first antenna, one end of the capacitor C1703 and the capacitor C1704 are grounded, and the other ends are respectively connected to the two ends of the inductor L1702.

9. The intelligent wireless doorbell with improved anti-interference capability according to any one of claims 1 to 5, characterized in that: The second 433MHz wireless module is a wireless receiving module, including a wireless receiving chip U102, a second antenna matching network, a second crystal oscillator and a second antenna. Pins 7 and 8 of the wireless receiving chip U102 are connected to the second crystal oscillator, pin 14 is connected to the second antenna through the second antenna matching network, pins 1-4 are SPI interfaces connected to the second MCU, and pins 5-6 and 9-10 are GPIO interfaces connected to the second MCU.

10. The intelligent wireless doorbell with improved anti-interference capability according to claim 9, characterized in that: The wireless receiving chip U102 adopts a CMT2219A receiving chip, and the second antenna matching network includes a capacitor C106, an inductor L101, an inductor L102 and a resistor R106, wherein the capacitor C106 and the resistor R106 are connected in series, and one end is connected to the second antenna, and one end of the inductor L101 and the inductor L102 is grounded, and the other end is respectively connected to the two ends of the capacitor C106.

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