An off-line voice switch panel

Abstract

This utility model relates to the field of switch panels and discloses an offline voice switch panel, including a housing and two circuit function boards. The two circuit boards are connected by pin headers. Each circuit function board further includes a wireless self-organizing network unit, an offline voice control unit, an IO expansion unit, an infrared control unit, a relay control unit, a button control unit, an LED indicator unit, and a power supply unit. The wireless self-organizing network unit is connected to the offline voice control unit via UART. The wireless self-organizing network unit is connected to the IO expansion unit and the button control unit via GPIO respectively. The offline voice control unit is connected to the infrared control unit via GPIO. This utility model enables the offline voice switch panel to respond quickly without a network connection, integrates multiple functional units, expands control capabilities and application range, provides stable power supply, has low cost, and is easy to install and maintain.

Description

Technical Field

[0001] This utility model relates to the field of switch panels, specifically to an offline voice switch panel. Background Technology

[0002] With the rapid development of IoT technology, smart hotel control systems are becoming increasingly popular, and customers' demands for intelligent and convenient control of guest room equipment are constantly increasing. Currently, most smart switch panels on the market rely on network connections and achieve remote control through mobile apps or cloud-based voice assistants. Although these devices are feature-rich, they suffer from control failures when the network is unstable, data transmission delays, and also involve high deployment and maintenance costs.

[0003] In pursuit of efficient, stable, and intelligent control, offline voice control technology has gradually become a research hotspot. Compared to network-dependent intelligent control devices, offline voice control can respond to voice commands in real time without an internet connection, effectively avoiding control interruptions caused by network failures, and features fast response speed and high privacy security. However, existing offline voice control devices still have shortcomings in functional integration and application adaptability, making it difficult to meet the unified control needs of diverse equipment in hotel rooms.

[0004] Based on this, this utility model proposes an offline voice switch panel. By integrating multiple functional units such as a self-organizing wireless module and an offline voice control unit, it can achieve low-cost offline voice control while being compatible with multiple control methods such as infrared and relays. This effectively solves the problems of existing smart switch panels relying on networks and having limited functions, providing a more reliable and cost-effective solution for the intelligent upgrade of hotels. Utility Model Content

[0005] The purpose of this utility model is to provide an offline voice switch panel to solve the following technical problems: Currently, smart switch panels suffer from problems such as reliance on the network and easy interruption, limited functionality, limited control capabilities, poor power supply stability, high cost, and inconvenient installation and maintenance, which urgently need to be improved.

[0006] The purpose of this utility model can be achieved through the following technical solution: an offline voice switch panel, including a shell and two circuit function boards, the two circuit boards being connected by pin headers, and the circuit function boards further including a wireless self-organizing network unit, an offline voice control unit, an IO expansion unit, an infrared control unit, a relay control unit, a button control unit, an LED indicator unit, and a power supply unit;

[0007] The wireless self-organizing network unit includes a wireless self-organizing network module, a 3.3V power supply, capacitors (C13, C21), a firmware download port, resistors, and a communication module. The communication module is used for data reception and transmission.

[0008] The firmware download port and the wireless self-organizing network module are connected to a 3.3V power supply. The resistor is connected to the pins of the wireless self-organizing network module. One end of the capacitor C13 is connected to the 3.3V power supply and the other end is grounded. One end of the capacitor C21 is connected to the connection point between the resistor and the pins of the wireless self-organizing network module and the other end is grounded. The communication module is connected to the pins of the wireless self-organizing network module respectively.

[0009] The wireless self-organizing network module is internally composed of a dual-mode wireless chip, crystal oscillator, inductor, circuit, RF matching circuit and onboard antenna; the wireless self-organizing network module adopts a three-sided half-hole design and is connected to the control panel by surface mount soldering; the button control unit is connected to the eight independent GPIO interfaces of the self-organizing network module.

[0010] As a preferred embodiment of this utility model: the wireless self-organizing network module is internally composed of a dual-mode wireless chip, a crystal oscillator, an inductor, a circuit, an RF matching circuit, and an onboard antenna; the wireless self-organizing network module adopts a three-sided half-hole design and is connected to the control panel by surface mount soldering; the button control unit is connected to the eight independent GPIO interfaces of the self-organizing network module.

[0011] As a preferred embodiment of this utility model: the offline voice control unit includes a microphone array, a voice processing chip, and an audio driver circuit; each channel of the microphone array is connected to the audio input pin of the voice processing chip through an independent signal conditioning circuit, the signal conditioning circuit including a protection diode and an impedance matching resistor; the power supply pin of the voice processing chip is connected to a power supply filtered by multiple capacitors; the audio output pin of the voice processing chip is connected to an audio driver circuit composed of MOSFETs, the audio driver circuit including a protection diode, and its output terminal is connected to a speaker; the control pin of the voice processing chip is connected to an LED indicator and an external debugging interface respectively; the communication pin of the voice processing chip is connected to the system bus.

[0012] As a preferred embodiment of this utility model: the IO expansion unit includes at least two cascaded serial-to-parallel conversion chips; the power supply terminal of the serial-to-parallel conversion chip is connected to a power supply and a filter capacitor in parallel; the output pins of the serial-to-parallel conversion chip are respectively connected to an LED indicator array and a relay drive circuit; the control pins of the serial-to-parallel conversion chip include a serial data input pin, a shift clock pin, a latch clock pin, and an output enable pin; the data input pin of the first-stage chip is connected to the system bus, and the cascaded output pin of the last-stage chip is connected to the data input pin of the next-stage chip, thereby realizing the function of multi-chip cascading expansion of I / O ports.

[0013] As a preferred embodiment of this utility model: the infrared control unit includes an infrared emitting circuit, an infrared receiving circuit, and a power conversion circuit; the infrared emitting circuit includes multiple infrared light-emitting diodes connected in parallel, the positive terminal of each light-emitting diode is connected to a 5V power supply through a current-limiting resistor, the negative terminal is grounded through a field-effect transistor, and the gate of the field-effect transistor is connected to a control signal terminal; the infrared receiving circuit includes an infrared receiving diode, the output terminal of which is connected to the system bus through a signal conditioning circuit; the power conversion circuit includes a voltage regulator chip, which converts the 5V power supply to a 3.3V power supply and outputs it through a filter capacitor.

[0014] As a preferred embodiment of this utility model: the relay control unit includes a driver chip and peripheral circuitry; the power supply terminal of the driver chip is connected to a 5V power supply and system ground; the input pin of the driver chip is connected to the system bus; the output pin of the driver chip is connected to the relay coil; and the driver chip integrates a reverse electromotive force protection diode.

[0015] As a preferred embodiment of this utility model: the button control unit includes multiple function buttons and a signal conditioning circuit; one end of the function button is connected to a 3.3V power supply through a pull-up resistor, and the other end is grounded; the signal terminal of the function button is connected in parallel with a debouncing capacitor, and led out from the connection point between the resistor and the button to the system bus; when the button is pressed, the signal terminal level changes from high to low, generating a button trigger signal.

[0016] As a preferred embodiment of this utility model: the touch control unit includes a touch detection circuit and a touch processing chip; the touch detection circuit includes multiple touch nodes, the touch nodes are connected to the gate of a field-effect transistor through a current-limiting resistor, the source of the field-effect transistor is grounded, and the drain is connected to the signal input pin of the touch processing chip; the power supply terminal of the touch processing chip is connected to a 3.3V power supply and a filter capacitor is connected in parallel; the output pin of the touch processing chip is connected to the system bus.

[0017] The beneficial effects of this utility model are:

[0018] (1) The offline voice switch panel of this utility model has many beneficial effects. It adopts offline voice control technology, which can respond to voice commands in real time without relying on the network, avoiding the control failure caused by network failure, significantly improving the stability and response speed of control, and ensuring user privacy and security. By integrating a self-organizing wireless module, it realizes autonomous networking communication between devices, which facilitates system expansion and device management. The IO expansion unit expands 16 GPIO ports through the cascading of two 74HC595D chips, which greatly enhances the input and output control capability of the panel and can flexibly adapt to more external devices. The infrared control unit includes a transmitting and receiving unit, which can realize the control of devices with infrared remote control function, expanding the application range of the panel.

[0019] (2) This utility model can independently control different loads through the 4 outputs of the relay control unit to meet the diverse control needs of electrical equipment; the button control unit and the LED indicator unit work together to intuitively indicate the operating status of the equipment, which is convenient for users to operate and monitor; the power supply unit adopts the power supply method of ACDC chip to 5V and then LDO to 3.3V, which has overcurrent and overvoltage protection and low noise output characteristics, ensuring the stability and reliability of the power supply of each module; in addition, the panel is composed of a power base plate and a control panel connected to the pin header and socket by a buckle, which is compact and easy to install and maintain. Overall, it provides an efficient, convenient and feature-rich intelligent control solution for the hotel scene at a low cost. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a connection diagram for the offline voice switch module;

[0022] Figure 2 This is a schematic diagram of a wireless self-organizing network unit circuit.

[0023] Figure 3 This is a schematic diagram of the circuit connection for the offline voice control unit;

[0024] Figure 4 This is a schematic diagram of the I / O expansion unit circuit connection;

[0025] Figure 5 This is a schematic diagram of the infrared control unit circuit connection;

[0026] Figure 6 Schematic diagram of relay control unit circuit connection

[0027] Figure 7 This is a schematic diagram of the circuit connection for the button control unit;

[0028] Figure 8 This is a schematic diagram of the LED indicator unit circuit structure;

[0029] Figure 9 This is a schematic diagram of the touch control circuit connection. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figures 1-9 As shown, this utility model is an offline voice switch panel, including a housing and two circuit function boards, which are connected by pin headers; each circuit function board further includes a wireless self-organizing network unit, an offline voice control unit, an IO expansion unit, an infrared control unit, a relay control unit, a button control unit, an LED indicator unit, and a power supply unit, and each unit satisfies the following connection relationship:

[0032] The offline voice control unit is connected to two independent GPIO (General-Purpose Input / Output) ports of the self-organizing wireless module via electrical connection to enable data interaction between voice commands and wireless signals;

[0033] The IO expansion unit is electrically connected to the four independent GPIO ports of the self-organizing wireless module to expand more input and output functions;

[0034] The infrared control unit is electrically connected to two independent GPIO ports of the offline voice control unit for transmitting infrared control signals.

[0035] The relay control unit is electrically connected to four independent GPIO ports of the IO expansion unit and one independent GPIO port of the self-organizing wireless module to control the relay.

[0036] The button control unit is electrically connected to eight independent GPIO ports of the self-organizing wireless module to transmit button operation signals to the wireless module.

[0037] The LED indicator unit is electrically connected to eight independent GPIO ports of the IO expansion unit to control the indicator lights.

[0038] The power supply unit's input terminal is connected to an external power supply terminal, and its 5V output terminal is electrically connected to the offline voice control unit, infrared control unit, and relay control unit; its 3.3V output terminal is electrically connected to the self-organizing wireless module, IO expansion unit, button control unit, and LED indicator unit.

[0039] The two circuit function boards include a power supply base plate and a control panel. The power supply base plate is fixed inside the bottom shell by a snap-fit ​​and is connected to the control panel by pin headers and sockets with a spacing of 2.54mm that include power and control signal transmission functions.

[0040] The self-organizing wireless module adopts a three-sided half-hole design and is connected to the circuit board by surface mount soldering. To avoid signal interference, the area of ​​the circuit board below the antenna of the wireless module is set as a blank rectangular area without electronic components or wiring, and the area of ​​this area is not less than 1.2 times the projected area of ​​the antenna.

[0041] The IO expansion unit expands 16 GPIO ports by cascading two 74HC595D chips. Specifically, the serial output (Q7') of the first 74HC595D chip is connected to the serial input (SER) of the second chip. The clock signal (SCK) and latch signal (RCK) of the two chips are connected in parallel and then connected to the control signal output port of the self-organizing wireless module to realize synchronous control and data transmission of the 16 GPIO ports.

[0042] The infrared control unit includes an infrared transmitting unit and an infrared receiving unit; wherein, the infrared transmitting unit is used to convert the control signal output by the offline voice control unit into an infrared signal and transmit it, and the infrared receiving unit is used to receive external infrared signals and convert them into electrical signals for transmission to the offline voice control unit for processing.

[0043] The relay control unit includes four outputs, each equipped with an independent drive circuit, which can realize the on / off control of different loads; the unit drives the relay to operate by receiving control signals from the IO expansion unit and the self-organizing wireless module.

[0044] The button control unit and the LED indicator control unit work together to indicate the operating status of the device, such as power-on, standby, fault, and communication connection status, through different on / off and flashing states of the LED indicator.

[0045] The power supply unit supports external power input. The input voltage is converted to 5V DC by an ACDC chip, and then further converted to 3.3V DC by an LDO (Low Dropout Regulator) chip to power other modules. The ACDC chip has overcurrent and overvoltage protection functions, and the LDO chip has low noise output characteristics to ensure power supply stability and reliability.

[0046] The working principle of this utility model: This design uses a gray controller housing, and includes two circuit function boards: a power supply base plate and a control panel. The power supply base plate is fixed inside the base housing by clips and connected to the control panel via pin headers and sockets. Figure 2 As shown;

[0047] The self-organizing network intelligent wireless module, model MT31, is a 2.4GHz band wireless sensor network communication module compliant with the IEEE 802.15.4 standard. It is designed with the TLSR8359F52SoC processor chip as its core. It hides the communication chip and the necessary external components, as well as the complex design process related to high-frequency wiring and radio frequency, forming a stable communication module with high radio frequency performance. It adopts a three-sided half-hole design layout, and the circuit function board has a surface-mount package for the wireless module, which can be compatible with other types of wireless modules with the same shape package, realizing the functional design of flexible replacement of wireless modules.

[0048] The MT31 wireless module can be directly soldered onto the PCB board through a half-hole via. A 10uF / 16V 0603-packaged capacitor and a 100nF / 50V 0603-packaged capacitor are connected to the VCC pin for filtering. Five signal lines, namely VCC, GND, PD2, SWS, and RESET, are led out and connected to a 1.5mm*1.5mm circular pad with a 0.8mm via size. The programming interface is arranged with a 2mm spacing for easy software updates and iterations.

[0049] The offline voice control unit comprises an offline voice module and a TTS voice module, both using the Qiying Tailun solution. The Qiying Tailun chip is an SSOP24-packaged CI1303 chip, and the TTS chip is a QFN56L-packaged CI1103 chip. These are packaged as two modules. The PA5 and PA6 pins of the offline voice module are connected to the PB7 and PB1 ports of the self-organizing network wireless module, respectively. The TX0 and RX0 pins of the offline voice module are connected to two independent pads, forming a spacing of 2 with 5V and GND. The offline voice module has a 0mm programming hole; the MIC- and MIC+ pins are connected to an SMD-packaged microphone JMO-650B-323C-100S, and each pin is connected to an SOD-323-packaged TVS diode BV05C to GND; a 0603-packaged 100nF / 50V capacitor is connected in parallel between the HPOUT and S_IN pins of the offline voice module; the SPK+ and SPK- pins of the offline voice module are connected to an SMD, P=1.25mm packaged 2 On the P connector, two pins are simultaneously connected to a BV05C TVS diode in an SOD-323 package to GND. The 5V and GND pins of the offline voice module are connected to the following filters: an SMF6.0A TVS diode in an SOD-123FL package, a 10uF / 16V capacitor in a 0805 package, and a 100nF / 50V capacitor in a 0603 package. The PA2 and PA3 pins of the offline voice module are connected to the RX pin of the TTS voice module. On ports 1 and TX1, pin IO34 of the TTS voice module is connected to the S_EN pin of the offline voice module; pins TX0, RX0, and FLASH_EN of the TTS voice module are connected to three independent pads, forming a 2.0mm pitch programming hole with 5V and GND; pins 5V and GND of the TTS voice module are connected to 5V and GND; pin HPOUT of the TTS voice module is connected to the S_EN pin of the offline voice module after a 100nF / 50V capacitor in a 0603 package is connected in series.

[0050] The I / O expansion unit includes two cascaded SOP-16 packaged SM74HC595D chips, expanding 16 GPIO ports. The RCK and SCK pins of the two SM74HC595D chips are connected to the PC4 and PC5 ports of the self-organizing wireless module, respectively. The SER pin of the first chip is connected to the PB4 port of the self-organizing wireless module. The Q7' pin of the first chip is connected to the SER pin of the second chip. Pins 13 (G#) of both chips are connected to the PC1 port of the self-organizing wireless module, and are also connected to a 10K pull-up resistor in a 0603 package. Pins 10 (SCLR#) of both chips are each connected to a 10K pull-up resistor in a 0603 package. The VDD pins of both chips are filtered through a 100nF / 50V capacitor in a 0603 package and then connected to 3.3V. The GND pins of both chips are connected to GND.

[0051] The infrared control unit includes an infrared receiving unit and an infrared transmitting unit. The infrared receiving unit includes an SMD-4P packaged infrared receiver head IRM-H638T / TR2(DX). A 3.3V input is connected in series with a 0603 packaged 100R resistor and then connected to the VCC pin of the infrared receiver head, along with a 0603 packaged 100nF / 50V capacitor for filtering. The GND pin is connected to GND. The OUT pin is connected to the PA4 port of the offline voice module, along with a 0603 packaged 20K pull-up resistor. The infrared transmitting unit has a total of 4 channels. The IR26-21C / L110 / CT infrared LEDs in a 1206 package are connected to the positive terminal of the IR26-21C / L110 / CT via a 5V power supply connected in series with a 5.1R resistor in a 0603 package. The negative terminals of the infrared LEDs are shorted together and connected to the drain of an SOT-23-3 packaged NMOS transistor, SI2302. The source of the NMOS transistor is connected to GND. A 10K resistor in a 0603 package is connected in parallel between the gate and the source. The gate of the NMOS transistor is connected in series with a 100R resistor in a 0603 package and then connected to the PC4 port of the offline voice module.

[0052] The relay control unit includes 4-channel relay control. Here, a 5V / 10A relay in a 10.2*18.4mm package and an SOP16 packaged ULN2003A are used for driving. A zero-crossing detection circuit is used to increase the relay's lifespan. The high-voltage contact control terminal of the relay is connected to an external terminal block; the low-voltage coil control terminal is connected to 5V, and the other end is connected to pins 13-16 of the ULN2003A; pins 1-4 of the ULN2003A are connected to pins 4-7 of the first SM74HC595D chip in the IO expansion unit; pin 8 of the ULN2003A is connected to GND; ULN... Pin 9 of the 2003A is connected to 5V. The zero-crossing detection circuit uses a DIP-4 packaged optocoupler PC817. The live wire passes through a through-hole packaged wire-wound resistor KNP1W-10Ω±5%T, then is connected in series with a DO-41 packaged diode 1N4007, then in series with a through-hole packaged 220K resistor, and finally connected to pin 1 of the optocoupler PC817. Pin 2 of the optocoupler is connected to the neutral wire; pin 3 is connected to GND; pin 4 is connected to the PC0 port of the self-organizing wireless module, and is also connected to a 0603 packaged 10K pull-up resistor and a 0603 packaged 100nF / 50V capacitor for filtering.

[0053] The button control unit includes 4 mechanical buttons and 4 touch buttons. The mechanical buttons use SMD-6.2*6.2*4 packaged tactile switches. Pins 1 and 2 of each tactile switch are shorted and connected to the PA0, PC6, PD3, and PD4 ports of the self-organizing wireless module, respectively. Each button is also connected to a 10K pull-up resistor (0603 package) and a 100nF / 50V capacitor (0603 package) for filtering. The touch buttons use PCB pads, and the touch chip is an MSOP-10 packaged BS814A-1. The four touch pads are connected to the touch chip... Connect a 0603-packaged capacitor to GND on each of the KEY1, KEY2, KEY3, and KEY4 ports of the touch chip. The smaller the capacitor, the higher the touch sensitivity. Connect a 1K 0603-packaged resistor in series to each of the KOUT1, KOUT2, KOUT3, and KOUT4 ​​pins of the touch chip, and then connect them to the PD2, PA7, PA1, and PD7 ports of the self-organizing wireless module, respectively. Connect the VDD pin of the touch chip to 3.3V and connect a 100nF / 50V 0603-packaged capacitor for filtering. Connect the GND pin to GND.

[0054] The LED indicator control unit includes mechanical button backlights and touch button backlights. The mechanical button backlights use 0603-packaged white and yellow LEDs to indicate button actions. Eight white LEDs are connected to 3.3V at their positive terminals, then grouped in pairs to form four groups. Each group's negative terminal is connected in series with a 0603-packaged 560R resistor and then connected to the Q0, Q1, Q2, and Q3 ports of the first SM74HC595D chip in the I / O expansion module. The eight yellow LEDs are shorted at their negative terminals and connected to pin 11 of a ULN2003A chip. Pin 6 of the ULN2003A is connected to the Q5 port of the second SM74HC595D chip in the I / O expansion module. These are then grouped in pairs to form four groups. Each group's positive terminal is connected in series with a 0603-packaged 560R resistor and then connected to the I / O expansion module. On the first 74HC595D chip of the expansion module, the touch button backlight uses white and yellow LEDs in 0603 packages to indicate button operation. The positive terminals of the four white indicator lights are connected to 3.3V, and the negative terminals are connected in series with a 560R 0603 package resistor and then connected to the Q0, Q1, Q2, and Q3 ports of the second SM74HC595D chip of the expansion module. The negative terminals of the four yellow indicator lights are shorted and connected to pin 12 of the ULN2003A. Pin 5 of the ULN2003A is connected to the Q4 port of the second SM74HC595D chip of the expansion module. The positive terminals of the yellow LEDs are connected in series with a 560R 0603 package resistor and then connected to the Q0, Q1, Q2, and Q3 ports of the second 74HC595D chip of the expansion module.

[0055] The power supply unit includes an ACCDC to 5V power module and an LDO to 3.3V converter. The live wire is connected to the L pin of the ACCDC module via a through-hole packaged wire-wound resistor KNP1W-10Ω±5%T; the neutral wire is connected to the N pin of the ACCDC module; a through-hole packaged varistor 07D471K is connected in parallel between the L and N pins; the 5V output from the ACCDC module is filtered by a 10uF / 16V capacitor in a 0805 package and then connected to the VIN pin of an LDOAMS1117-3.3 in an SOT-223-3 package; the GND pin of the LDO is connected to GND; the VOUT pin of the LDO is filtered by a 10uF / 16V capacitor in a 0805 package, and then by a 100nF / 50V capacitor in a 0603 package before outputting 3.3V.

[0056] The above description details one embodiment of the present utility model, but it is merely a preferred embodiment and should not be construed as limiting the scope of the present utility model. All variations and modifications made within the scope of the present utility model application should still fall within the patent coverage of the present utility model.

Claims

1. An off-line voice switch panel comprising a housing and two circuit function boards connected by a bank of pins between the two circuit boards, characterized in that, The circuit board further includes a wireless self-organizing network unit, an offline voice control unit, an IO expansion unit, an infrared control unit, a relay control unit, a button control unit, a touch control unit, an LED indicator unit, and a power supply unit. The wireless self-organizing network unit is connected to the offline voice control unit via UART; the wireless self-organizing network unit is connected to the IO expansion unit and the button control unit via GPIO respectively; the offline voice control unit is connected to the infrared control unit via GPIO; the IO expansion unit is connected to the relay control unit and the LED indicator unit via GPIO; The infrared control unit, relay control unit, button control unit, LED indicator unit, and offline voice control unit are all signal-connected to the power supply unit. The relay control unit is signal-connected to the offline voice control unit. The wireless self-organizing network unit, the offline voice control unit, the IO expansion unit, the infrared control unit, the relay control unit, the button control unit, the LED indicator unit, and the power supply unit are all powered by the power supply unit.

2. The offline voice switch panel according to claim 1, characterized in that, The wireless self-organizing network unit includes a wireless self-organizing network module, a 3.3V power supply, capacitors (C13, C21), a firmware download port, resistors, and a communication module. The communication module is used for data reception and transmission. The firmware download port and the wireless self-organizing network module are connected to a 3.3V power supply. The resistor is connected to the pins of the wireless self-organizing network module. One end of the capacitor C13 is connected to the 3.3V power supply and the other end is grounded. One end of the capacitor C21 is connected to the connection point between the resistor and the pins of the wireless self-organizing network module and the other end is grounded. The communication module is connected to the pins of the wireless self-organizing network module respectively. The wireless self-organizing network module is internally composed of a dual-mode wireless chip, crystal oscillator, inductor, circuit, RF matching circuit and onboard antenna; the wireless self-organizing network module adopts a three-sided half-hole design and is connected to the control panel by surface mount soldering; the button control unit is connected to the eight independent GPIO interfaces of the self-organizing network module.

3. The offline voice switch panel according to claim 1, characterized in that, The offline voice control unit includes a microphone array, a voice processing chip, and an audio driver circuit. Each channel of the microphone array is connected to the audio input pin of the voice processing chip via an independent signal conditioning circuit, which includes a protection diode and an impedance matching resistor. The power supply pin of the voice processing chip is connected to a power supply filtered by multiple capacitors. The audio output pin of the voice processing chip is connected to an audio driver circuit composed of MOSFETs, which includes a protection diode and has its output connected to a speaker. The control pins of the voice processing chip are connected to an LED indicator and an external debugging interface. The communication pins of the voice processing chip are connected to the system bus.

4. The offline voice switch panel according to claim 1, characterized in that, The I / O expansion unit includes at least two cascaded serial-to-parallel conversion chips; the power supply terminal of the serial-to-parallel conversion chip is connected to a power supply and a filter capacitor in parallel; the output pins of the serial-to-parallel conversion chip are respectively connected to an LED indicator array and a relay drive circuit; the control pins of the serial-to-parallel conversion chip include a serial data input pin, a shift clock pin, a latch clock pin, and an output enable pin; the data input pin of the first-stage chip is connected to the system bus, and the cascaded output pin of the last-stage chip is connected to the data input pin of the next-stage chip, realizing the function of multi-chip cascading expansion of I / O ports.

5. The offline voice switch panel according to claim 1, characterized in that, The infrared control unit includes an infrared emitting circuit, an infrared receiving circuit, and a power conversion circuit. The infrared emitting circuit includes multiple infrared light-emitting diodes connected in parallel. The positive terminal of each light-emitting diode is connected to a 5V power supply through a current-limiting resistor, and the negative terminal is grounded through a field-effect transistor. The gate of the field-effect transistor is connected to a control signal terminal. The infrared receiving circuit includes an infrared receiving diode, and the output terminal of the receiving diode is connected to the system bus through a signal conditioning circuit. The power conversion circuit includes a voltage regulator chip, which converts the 5V power supply to a 3.3V power supply and outputs it through a filter capacitor.

6. The offline voice switch panel according to claim 1, characterized in that, The relay control unit includes a driver chip and peripheral circuitry; the power supply terminal of the driver chip is connected to a 5V power supply and system ground; the input pin of the driver chip is connected to the system bus; the output pin of the driver chip is connected to the relay coil; and the driver chip integrates a reverse electromotive force protection diode.

7. The offline voice switch panel according to claim 1, characterized in that, The button control unit includes multiple function buttons and signal conditioning circuits; one end of each function button is connected to a 3.3V power supply via a pull-up resistor, and the other end is grounded; a debouncing capacitor is connected in parallel to the signal terminal of each function button, and the signal is led out from the connection point between the resistor and the button to the system bus; when a button is pressed, the signal level changes from high to low, generating a button trigger signal.

8. The offline voice switch panel according to claim 1, characterized in that, The touch control unit includes a touch detection circuit and a touch processing chip. The touch detection circuit includes multiple touch nodes, which are connected to the gate of a field-effect transistor (FET) through a current-limiting resistor. The source of the FET is grounded, and its drain is connected to the signal input pin of the touch processing chip. The power supply terminal of the touch processing chip is connected to a 3.3V power supply and a filter capacitor is connected in parallel. The output pin of the touch processing chip is connected to the system bus.

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