Wireless fire alarm system based on ZigBee and OneNET cloud platform

Abstract

The utility model discloses a wireless fire alarm system based on ZigBee and an OneNET cloud platform, the wireless fire alarm system is built based on the ZigBee technology and the OneNET cloud platform, short-distance data transmission in fire monitoring is realized by adopting ZigBee communication, and the ZigBee communication has the advantages of low energy consumption and low cost, so that the problems of high cost and high power consumption in the traditional technology can be solved, and meanwhile, the wireless fire alarm system based on the ZigBee and the OneNET cloud platform can be applied to fire monitoring. Due to the characteristic of low-power-consumption transmission of ZigBee communication, the equipment can run for a long time, so that the equipment is not limited by a power supply; besides, the terminal nodes are uniformly networked through the ZigBee coordinator, and data interaction with the monitoring end is realized based on an OneNET cloud platform, so that real-time monitoring and timely alarm of the fire behavior can be remotely realized; therefore, the utility model provides an efficient and reliable fire detection and alarm scheme, thereby being very suitable for large-scale application and popularization in the field of fire monitoring.

Description

Technical Field

[0001] This utility model belongs to the field of fire monitoring technology, specifically relating to a wireless fire alarm system based on ZigBee and OneNET cloud platform. Background Technology

[0002] In the intelligent fire protection industry, due to the diversity of product systems and network construction methods, the implementation methods of wireless fire protection also exhibit diversified characteristics. Currently, the market mainly uses wired or wireless communication for data transmission. However, wired communication suffers from problems such as short transmission distance and instability. Therefore, wireless communication is gradually replacing wired communication, and its market size is constantly expanding. With the continuous advancement of technology and the increase in market demand, this trend will continue and is expected to become an important growth point in the field of safety protection.

[0003] In intelligent fire alarm equipment, most data is transmitted at low speed over short distances. Using complex communication protocols not only consumes a lot of power but also wastes communication resources and increases costs. Therefore, traditional wireless fire alarm equipment suffers from high power consumption and high price. Based on this, how to provide a low-cost and low-power wireless fire alarm system has become an urgent problem to be solved. Utility Model Content

[0004] The purpose of this invention is to provide a wireless fire alarm system based on ZigBee and the OneNET cloud platform to solve the problems of high power consumption and high cost in existing technologies.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] Firstly, a wireless fire alarm system based on the ZigBee and OneNET cloud platform is provided, including:

[0007] Several sensing devices and several fire monitoring devices, wherein each fire monitoring device corresponds to one sensing device, and each sensing device includes a ZigBee terminal, a control module and an alarm module;

[0008] Each fire monitoring device includes a temperature and humidity detection module and a combustible gas detection module;

[0009] The input terminals of the control modules in each sensing device are electrically connected to the output terminals of the temperature and humidity detection module and the combustible gas detection module in the corresponding fire monitoring device. The output terminals of the control modules in each sensing device are electrically connected to the input terminals of the corresponding ZigBee terminals. The alarm output terminals of the ZigBee terminals in each sensing device are electrically connected to the corresponding alarm modules.

[0010] ZigBee coordinator, collaborative control module, and communication module;

[0011] The ZigBee terminals in each sensing device are communicatively connected to the ZigBee coordinator. The ZigBee coordinator is electrically connected to the first data transmission terminal of the collaborative control module. The second data transmission terminal of the collaborative control module is communicatively connected to the OneNET cloud platform through the communication module, and the OneNET cloud platform is communicatively connected to the monitoring terminal.

[0012] Based on the above-disclosed content, this utility model constructs a wireless monitoring network composed of a coordinator and several terminal nodes based on ZigBee technology. Specifically, the terminal nodes include fire monitoring equipment and sensing equipment. The fire monitoring equipment includes a temperature and humidity detection module and a combustible gas detection module, while the sensing equipment includes a ZigBee terminal, a control module, and an alarm module. In specific applications, the temperature and humidity detection module and the combustible gas detection module are used for real-time fire detection and transmit the detection data to the control module in the corresponding sensing device in real time. Then, the control module transmits the data to the corresponding ZigBee terminal. At this time, the ZigBee terminal can control the alarm module to work based on the detection data, thereby realizing timely fire alarm. At the same time, all terminal nodes (i.e., all ZigBee terminals) are networked uniformly by the ZigBee coordinator. In this way, the fire detection data received by each ZigBee terminal can be uniformly uploaded to the collaborative control module through the ZigBee coordinator, and then uploaded to the OneNET cloud platform by the collaborative control module. Finally, the fire detection data can be distributed to the monitoring terminal through the OneNET cloud platform, thereby completing the task of remote fire monitoring of the environment.

[0013] Through the above design, the wireless fire alarm system provided by this utility model is built based on ZigBee technology and the OneNET cloud platform. The short-range data transmission in fire monitoring is achieved using ZigBee communication, which has the advantages of low energy consumption and low cost. Therefore, it can solve the problems of high cost and high power consumption of traditional technologies. Furthermore, due to the low-power transmission characteristics of ZigBee communication, the device can operate for extended periods without being limited by power supply. In addition, terminal nodes are networked uniformly through a ZigBee coordinator and interact with the monitoring terminal based on the OneNET cloud platform. Thus, real-time remote monitoring and timely alarm of fire can be achieved. Therefore, this utility model provides an efficient and reliable fire detection and alarm solution, making it highly suitable for large-scale application and promotion in the field of fire monitoring.

[0014] In one possible design, the combustible gas detection module includes: a combustible gas sensor, a first light-emitting diode, a second light-emitting diode, a sliding rheostat, an LM393 dual voltage comparator, and an output interface, wherein the output interface includes a first pin, a second pin, a third pin, and a fourth pin.

[0015] The first inverting input terminal of the dual voltage comparator is electrically connected to the output terminal of the combustible gas sensor and the first pin of the output interface. The first non-inverting input terminal of the dual voltage comparator is electrically connected to the sliding terminal of the sliding rheostat. A first capacitor is also connected in parallel between the first inverting input terminal of the dual voltage comparator and the ground terminal. The power supply terminal of the dual voltage comparator is electrically connected to one end of the first power supply and one end of the second capacitor, respectively. The common connection terminal between the first capacitor and the ground terminal and the other end of the second capacitor are respectively grounded.

[0016] One end of the sliding rheostat is electrically connected to one end of the first resistor, the positive terminal of the first light-emitting diode, the positive terminal of the second light-emitting diode, and the fourth pin of the output interface. The negative terminal of the first light-emitting diode is electrically connected to the third pin of the output interface through the second resistor, the negative terminal of the second light-emitting diode is electrically connected to the second pin of the output interface through the third resistor, and the second pin of the output interface is also electrically connected to the output terminal of the dual voltage comparator.

[0017] The other end of the sliding rheostat is grounded, and the output interface is also electrically connected to the control module in the corresponding sensing device.

[0018] In one possible design, the alarm module includes: a transistor and a sound-generating element;

[0019] The base of the transistor is electrically connected to one end of the third capacitor, one end of the fourth resistor, and one end of the fifth resistor, respectively. The collector of the transistor is electrically connected to one end of the sound-generating element, the other end of the sound-generating element is electrically connected to the second power supply, and the other end of the sound-generating element is also grounded through the fourth capacitor.

[0020] The other end of the fifth resistor is electrically connected to the alarm output terminal of the corresponding ZigBee terminal, and the other end of the fourth resistor, the other end of the third capacitor, and the emitter of the transistor are respectively grounded.

[0021] In one possible design, the alarm module further includes an LED indicator unit, wherein the indicator output terminal of the ZigBee terminal in each sensing device is electrically connected to the corresponding LED indicator unit.

[0022] In one possible design, the output of each combustible gas detection module is electrically connected to the corresponding control module via an AD conversion module.

[0023] In one possible design, each sensing device also includes: a display module and a reset module;

[0024] The display module includes a display driver unit and a display screen. The display output terminal of the ZigBee terminal in each sensing device is electrically connected to the input terminal of the display driver unit in the corresponding display module. The output terminal of the display driver unit is electrically connected to the corresponding display screen. The reset terminal of the ZigBee terminal in each sensing device is electrically connected to the corresponding reset module.

[0025] In one possible design, the collaborative control module and the control modules in each sensing device all use the CC2530 control chip and its peripheral circuits.

[0026] In one possible design, the communication module is a wireless communication module.

[0027] In one possible design, the wireless communication module is a WIFI communication module, and the WIFI communication module uses an ESP8266 WIFI communication chip and its peripheral circuits.

[0028] In one possible design, the temperature and humidity detection module uses a DHT11 type temperature and humidity sensor.

[0029] Beneficial effects:

[0030] (1) The wireless fire alarm system provided by this utility model is built on ZigBee technology and OneNET cloud platform. The short-range data transmission in fire monitoring is achieved by ZigBee communication. ZigBee communication has the advantages of low power consumption and low cost. Therefore, it can solve the problems of high cost and high power consumption of traditional technologies. At the same time, due to the low power transmission characteristics of ZigBee communication, the device can run for a long time without being limited by the power supply. In addition, the terminal nodes are networked in a unified manner through the ZigBee coordinator and realize data interaction with the monitoring end based on the OneNET cloud platform. In this way, real-time monitoring and timely alarm of fire can be realized remotely. Thus, this utility model provides an efficient and reliable fire detection and alarm solution, which is very suitable for large-scale application and promotion in the field of fire monitoring.

[0031] (2) ZigBee networks support self-organization and multi-hop routing, so that even if some nodes fail, the entire system can still maintain communication continuity and reliability; based on this, the reliability of use is improved. Attached Figure Description

[0032] Figure 1 A schematic diagram of the architecture of a wireless fire alarm system based on ZigBee and OneNET cloud platform provided for an embodiment of this utility model;

[0033] Figure 2 A detailed circuit diagram of the control module provided in this embodiment of the utility model;

[0034] Figure 3 A detailed circuit diagram of the temperature and humidity detection module provided in this embodiment of the utility model;

[0035] Figure 4 A detailed circuit diagram of the combustible gas detection module provided in this embodiment of the utility model;

[0036] Figure 5 A detailed circuit diagram of the alarm module provided in this embodiment of the utility model;

[0037] Figure 6 A connection diagram of a ZigBee terminal provided in an embodiment of this utility model;

[0038] Figure 7 A detailed circuit diagram of the communication module provided in this embodiment of the utility model;

[0039] Figure 8 The specific circuit diagram of the display module provided in the embodiment of this utility model is shown below. Detailed Implementation

[0040] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.

[0041] It should be understood that although the terms first, second, etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, the first unit may be referred to as the second unit, and similarly, the second unit may be referred to as the first unit, without departing from the scope of the exemplary embodiments of this utility model.

[0042] It should be understood that the term "and / or" that may appear in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" that may appear in this document describes another relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " that may appear in this document generally indicates that the related objects before and after it are in an "or" relationship.

[0043] Example:

[0044] See Figures 1 to 8 As shown, the wireless fire alarm system based on ZigBee and the OneNET cloud platform provided in this embodiment can be applied to areas such as campuses, shopping malls, and residences. It is mainly divided into a sensing layer, a network layer, and an application layer. The sensing layer mainly includes a ZigBee coordinator, a collaborative control module, several sensing devices, and several fire monitoring devices. The network layer mainly includes a communication module and the OneNET cloud platform. The application layer is the monitoring terminal (such as a mobile APP and a PC). The fire monitoring devices perform fire detection, while the sensing devices collect data detected by the fire monitoring devices and trigger fire alarms. The coordinator and collaborative control module are responsible for network organization, i.e., networking the various sensing devices and uploading data through the communication module. The OneNET cloud platform interacts with the monitoring terminal to complete the remote fire monitoring task.

[0045] In practical implementation, for example, each sensing device may include, but is not limited to, a ZigBee terminal, a control module, and an alarm module, while each fire monitoring device includes a temperature and humidity detection module and a combustible gas detection module. In practice, each fire monitoring device corresponds to one sensing device. Thus, the input terminal of the control module in each sensing device is electrically connected to the output terminal of the temperature and humidity detection module and the combustible gas detection module in the corresponding fire monitoring device, and the output terminal of the control module in each sensing device is electrically connected to the input terminal of the corresponding ZigBee terminal. In this way, the ZigBee communication protocol can be used to interact with the ZigBee terminal, thereby realizing the collection of detection data corresponding to each temperature and humidity detection module and combustible gas detection module.

[0046] Meanwhile, the alarm output terminal of the ZigBee terminal in each sensing device is electrically connected to the corresponding alarm module. In this way, when a fire is detected, the alarm module can be controlled to operate, thereby realizing timely fire alarm.

[0047] Furthermore, the ZigBee terminals in each sensing device are also communicatively connected to the ZigBee coordinator. The ZigBee coordinator is electrically connected to the first data transmission terminal of the collaborative control module. The second data transmission terminal of the collaborative control module is communicatively connected to the OneNET cloud platform via the communication module, and the OneNET cloud platform is communicatively connected to the monitoring terminal. Thus, this embodiment essentially uses the ZigBee coordinator to achieve unified networking of the various sensing devices, utilizes the collaborative control module to upload data, and finally uses the OneNET cloud platform to achieve data interaction with the monitoring terminal. In this way, the remote monitoring task of a fire can be completed.

[0048] In one specific implementation, alarm information can also be sent to the monitoring terminal via the network, that is, to the PC or the user's mobile device. In this way, even when no one is on duty, the fire can be detected in time and measures can be taken.

[0049] Therefore, as described above, this embodiment constructs a wireless monitoring network based on ZigBee technology, consisting of a coordinator and several terminal nodes. ZigBee communication is used to achieve short-range transmission of fire monitoring data, which can solve the problems of high cost and high power consumption of traditional technologies. At the same time, this embodiment also uses a ZigBee coordinator to unify the network and uses the OneNET cloud platform to realize data interaction with the monitoring terminal. In this way, remote fire monitoring and alarm can be completed.

[0050] In one possible design, the detailed circuit structure of each module in the aforementioned wireless fire alarm system is provided below.

[0051] First, the collaborative control module and the control modules in each sensing device, as exemplified, may, but are not limited to, use the CC2530 control chip and its peripheral circuits. The CC2530 control chip in the control module serves as the main control unit. On one hand, it receives data uploaded by the corresponding temperature and humidity detection module and combustible gas detection module. On the other hand, it interacts with the ZigBee coordinator via serial communication, enabling remote access and recording of the data. Simultaneously, based on the received detection data (such as when the temperature exceeds a threshold or the combustible gas concentration exceeds a threshold), it can trigger a local alarm, thus controlling the alarm module to operate.

[0052] Similarly, the CC2530 control chip in the collaborative control module, together with the communication module, interacts with the OneNET cloud platform via the MQTT protocol to achieve data uploading.

[0053] In this embodiment, the specific circuit diagram of the CC2530 control chip can be found, but is not limited to, in the following references: Figure 2 As shown, the peripheral circuit design of the CC2530 control chip involves several key components, including a high-frequency crystal oscillator and a low-frequency crystal oscillator to provide the system clock, a low-level reset circuit to ensure stable system startup, a power supply circuit that adapts to a wide voltage range but recommends 3.3V, a built-in 2.4GHz RF communication circuit, a high-precision ADC, a data security-related random number generator and AES encryption core, a flexible serial communication interface USART, and a watchdog timer with automatic reset function. The antenna circuit design includes a balun RF and an antenna to ensure effective transmission of wireless signals. Of course, its peripheral circuits are necessary to ensure the normal operation of the chip and are not limited to the examples mentioned above.

[0054] Secondly, this embodiment discloses one of the circuit structures of a combustible gas detection module.

[0055] In practical applications, the output terminals of each combustible gas detection module are electrically connected to the corresponding control module through an AD conversion module. In this way, the analog signal is converted into a digital signal through the AD conversion module, which makes it easy for the CC2530 control chip to identify. Of course, since the CC2530 control chip integrates a high-precision ADC, the AD conversion module does not need to be set up separately, thus reducing the cost of the entire sensing device.

[0056] Furthermore, the combustible gas detection module described herein may include, but is not limited to, a combustible gas sensor MQx, a first light-emitting diode D1, a second light-emitting diode D2, a sliding rheostat R6, an LM393 dual voltage comparator U1, and an output interface P1, wherein the output interface P1 includes a first pin, a second pin, a third pin, and a fourth pin, and the connection structure of the aforementioned electronic components is as follows:

[0057] See Figure 4 As shown, for example, the first inverting input terminal of the dual voltage comparator U1 is electrically connected to the output terminal of the combustible gas sensor MQx and the first pin of the output interface P1. The first non-inverting input terminal of the dual voltage comparator U1 is electrically connected to the sliding terminal of the sliding rheostat R6. A first capacitor C2 is connected in parallel between the first inverting input terminal of the dual voltage comparator U1 and the ground terminal. The power supply terminal of the dual voltage comparator U1 is electrically connected to the first power supply and one end of the second capacitor C1, respectively. The common connection terminal between the first capacitor C2 and the ground terminal and the other end of the second capacitor C1 are respectively grounded.

[0058] Meanwhile, one end of the sliding rheostat R6 is electrically connected to one end of the first resistor R5, the positive terminal of the first light-emitting diode D1, the positive terminal of the second light-emitting diode D2, and the fourth pin of the output interface P1. The negative terminal of the first light-emitting diode D1 is electrically connected to the third pin of the output interface P1 through the second resistor R3, and the negative terminal of the second light-emitting diode D2 is electrically connected to the second pin of the output interface P1 through the third resistor R4. The second pin of the output interface P1 is also electrically connected to the output terminal of the dual voltage comparator U1.

[0059] In addition, in this embodiment, the other end of the sliding rheostat R6 is grounded, and the output interface P1 is also electrically connected to the control module in the corresponding sensing device (that is, the first and second pins of P1 are electrically connected to the CC2530 control chip).

[0060] Furthermore, for example, a combustible gas sensor can be, but is not limited to, the QM-N10 type gas sensor, the circuit diagram of which can be found here. Figure 4 As shown.

[0061] Thus, this combustible gas detection module can detect the concentration of combustible gases, smoke, etc. Its internal gas sensor is made of metal oxide semiconductor (MOS) with a special material coated on its surface, which can adsorb and react with various gases. The sensitivity of these sensing elements to specific gases enables them to detect the presence and concentration of gases. The sensor contains a heater, usually composed of a nickel-chromium coil, which is responsible for heating the sensing element to a certain temperature (approximately 200-300 degrees Celsius) to keep it in optimal working condition. Based on this, when gas comes into contact with the sensing element, it causes a change in the element's resistance. The dual voltage comparator in the module converts the change in resistance into an electrical signal for output, thereby realizing the detection of gas concentration.

[0062] After describing the circuit of the combustible gas detection module, one circuit structure of the temperature and humidity detection model is provided below.

[0063] In this embodiment, the temperature and humidity detection module described herein may, but is not limited to, use a DHT11 type temperature and humidity sensor. The core components of the DHT11 sensor for measuring temperature and humidity are an NTC thermistor and a resistive humidity sensing element. Therefore, when the temperature and humidity in the air change, the resistance of the humidity sensing element and the NTC thermistor also changes. This resistance change is then converted into an electrical signal, thus completing the temperature and humidity detection. Optionally, a detailed circuit diagram of the DHT11 type temperature and humidity sensor can be found in [reference needed]. Figure 3 As shown, I will not go into further detail here.

[0064] After providing a detailed circuit description of the fire monitoring equipment, the circuit structure of the sensing device is presented below.

[0065] In this embodiment, the alarm module of the sensing device may, for example, include, but is not limited to, a transistor Q3 and a sound-generating element; wherein, the connection structure of the aforementioned electronic components is as follows:

[0066] See Figure 5 As shown, the base of transistor Q3 is electrically connected to one end of the third capacitor C9, one end of the fourth resistor R18, and one end of the fifth resistor R17, respectively. Simultaneously, the collector of transistor Q3 is electrically connected to one end of the sound-generating element, the other end of which is electrically connected to the second power supply (i.e., a 5V DC power supply), and the other end of the sound-generating element is also grounded through the fourth capacitor C8. Furthermore, the other end of the fifth resistor R17 is electrically connected to the alarm output terminal of the corresponding ZigBee terminal, and the other ends of the fourth resistor R18, the third capacitor C9, and the emitter of transistor Q3 are all grounded.

[0067] Thus, as explained in the circuit above, when the ZigBee terminal detects that the temperature exceeds the threshold, the smoke concentration exceeds the threshold, and / or the combustible gas concentration exceeds the threshold, it can control the operation of the sound-generating element based on the transistor Q3, thereby realizing a fire alarm prompt; for example, the sound-generating element can be, but is not limited to, a buzzer.

[0068] Additionally, the alarm module may include, but is not limited to, an LED indicator unit, wherein the indicator output terminal of the ZigBee terminal in each sensing device is electrically connected to the corresponding LED indicator unit. This allows for the integration of a buzzer to achieve an audible and visual alarm. Optionally, the LED indicator unit may be an LED indicator light; its connection architecture with the ZigBee terminal can be found in [reference needed]. Figure 6 As shown.

[0069] In one specific implementation, this embodiment provides a wider range of functional modules for the sensing device.

[0070] Among them, see Figure 6As shown, each sensing device may also include, but is not limited to, a display module and a reset module. The reset terminal of the ZigBee terminal in each sensing device is electrically connected to the corresponding reset module to achieve a forced reset of the ZigBee terminal based on the reset module. Of course, the reset module may be, but is not limited to, a reset button.

[0071] Meanwhile, in this embodiment, the example display module includes a display driving unit and a display screen. The display output terminal of the ZigBee terminal in each sensing device is electrically connected to the input terminal of the display driving unit in the corresponding display module, and the output terminal of the display driving unit is electrically connected to the corresponding display screen. In this way, temperature and humidity data and gas detection data can be visualized on the display screen.

[0072] Optionally, for example, the display driving unit may, but is not limited to, use an SSD1306 display driver chip, and the display screen may be an OLED display; the specific circuit of the SSD1306 display driver chip can be found in [reference needed]. Figure 8 As shown.

[0073] In addition, in this embodiment, the ZigBee terminal is also connected to a fire valve. Therefore, when a fire is detected (i.e., when the temperature exceeds the threshold, the smoke concentration exceeds the threshold, and / or the combustible gas concentration exceeds the threshold), the fire valve can be controlled to open, so as to deal with the fire in a timely manner. At the same time, LED indicator lights can also be used to indicate the opening status of the fire valve, so that the on-duty personnel can confirm whether the fire valve is open and then take appropriate countermeasures.

[0074] In one possible design, the following is a specific selection of the publicly available communication module.

[0075] In this embodiment, the communication module is exemplified as a wireless communication module. Optionally, this embodiment preferentially uses a WIFI communication module, and examples may include, but are not limited to, the ESP8266 WIFI communication chip and its peripheral circuitry. The specific circuit diagram of the ESP8266 WIFI communication chip can be found in [reference needed]. Figure 7 As shown.

[0076] Based on the detailed description of the wireless fire alarm system above, this invention designs a wireless fire alarm system based on CC2530 and ZigBee technology. This system uses OneNET as the development platform and ZigBee as the short-range fire data transmission network to collect and control sensor signals. This solves the problems of high cost and high power consumption inherent in traditional technologies. Furthermore, due to the low-power transmission characteristics of ZigBee communication, the device can operate for extended periods without power supply limitations. In addition, each ZigBee terminal is networked uniformly through a ZigBee coordinator and interacts with the monitoring terminal based on the OneNET cloud platform. Based on this, real-time remote monitoring and timely alarm of fire can be achieved. Therefore, this invention provides an efficient and reliable fire detection and alarm solution, making it highly suitable for large-scale application and promotion in the field of fire monitoring.

[0077] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A wireless fire alarm system based on ZigBee and OneNET cloud platform, characterized in that, include: Several sensing devices and several fire monitoring devices, wherein each fire monitoring device corresponds to one sensing device, and each sensing device includes a ZigBee terminal, a control module and an alarm module; Each fire monitoring device includes a temperature and humidity detection module and a combustible gas detection module; The input terminals of the control modules in each sensing device are electrically connected to the output terminals of the temperature and humidity detection module and the combustible gas detection module in the corresponding fire monitoring device. The output terminals of the control modules in each sensing device are electrically connected to the input terminals of the corresponding ZigBee terminals. The alarm output terminals of the ZigBee terminals in each sensing device are electrically connected to the corresponding alarm modules. ZigBee coordinator, collaborative control module, and communication module; The ZigBee terminals in each sensing device are communicatively connected to the ZigBee coordinator. The ZigBee coordinator is electrically connected to the first data transmission terminal of the collaborative control module. The second data transmission terminal of the collaborative control module is communicatively connected to the OneNET cloud platform through the communication module, and the OneNET cloud platform is communicatively connected to the monitoring terminal.

2. The wireless fire alarm system based on ZigBee and OneNET cloud platform according to claim 1, characterized in that, The combustible gas detection module includes: a combustible gas sensor, a first light-emitting diode (D1), a second light-emitting diode (D2), a sliding rheostat (R6), an LM393 dual voltage comparator (U1), and an output interface (P1), wherein the output interface (P1) includes a first pin, a second pin, a third pin, and a fourth pin. The first inverting input terminal of the dual voltage comparator (U1) is electrically connected to the output terminal of the combustible gas sensor and the first pin of the output interface (P1). The first non-inverting input terminal of the dual voltage comparator (U1) is electrically connected to the sliding terminal of the sliding rheostat (R6). A first capacitor (C2) is connected in parallel between the first inverting input terminal of the dual voltage comparator (U1) and the ground terminal. The power supply terminal of the dual voltage comparator (U1) is electrically connected to the first power supply and one end of the second capacitor (C1), and the common connection terminal between the first capacitor (C2) and the ground terminal and the other end of the second capacitor (C1) are respectively grounded. One end of the sliding rheostat (R6) is electrically connected to one end of the first resistor (R5), the positive terminal of the first light-emitting diode (D1), the positive terminal of the second light-emitting diode (D2), and the fourth pin of the output interface (P1). The negative terminal of the first light-emitting diode (D1) is electrically connected to the third pin of the output interface (P1) through the second resistor (R3), and the negative terminal of the second light-emitting diode (D2) is electrically connected to the second pin of the output interface (P1) through the third resistor (R4). The second pin of the output interface (P1) is also electrically connected to the output terminal of the dual voltage comparator (U1). The other end of the sliding rheostat (R6) is grounded, and the output interface (P1) is also electrically connected to the control module in the corresponding sensing device.

3. The wireless fire alarm system based on ZigBee and OneNET cloud platform according to claim 1, characterized in that, The alarm module includes: a transistor (Q3) and a sound-generating element; The base of the transistor (Q3) is electrically connected to one end of the third capacitor (C9), one end of the fourth resistor (R18), and one end of the fifth resistor (R17), respectively. The collector of the transistor (Q3) is electrically connected to one end of the sound-generating element, the other end of the sound-generating element is electrically connected to the second power supply, and the other end of the sound-generating element is also grounded through the fourth capacitor (C8). The other end of the fifth resistor (R17) is electrically connected to the alarm output terminal of the corresponding ZigBee terminal, and the other end of the fourth resistor (R18), the other end of the third capacitor (C9), and the emitter of the transistor (Q3) are respectively grounded.

4. A wireless fire alarm system based on ZigBee and OneNET cloud platform according to claim 1, characterized in that, The alarm module further includes an LED indicator unit, wherein the indicator output terminal of the ZigBee terminal in each sensing device is electrically connected to the corresponding LED indicator unit.

5. A wireless fire alarm system based on ZigBee and OneNET cloud platform according to claim 1, characterized in that, The output of each combustible gas detection module is electrically connected to the corresponding control module through an AD conversion module.

6. A wireless fire alarm system based on ZigBee and OneNET cloud platform according to claim 1, characterized in that, Each sensing device also includes: a display module and a reset module; The display module includes a display driver unit and a display screen. The display output terminal of the ZigBee terminal in each sensing device is electrically connected to the input terminal of the display driver unit in the corresponding display module. The output terminal of the display driver unit is electrically connected to the corresponding display screen. The reset terminal of the ZigBee terminal in each sensing device is electrically connected to the corresponding reset module.

7. A wireless fire alarm system based on ZigBee and OneNET cloud platform according to claim 1, characterized in that, The collaborative control module and the control modules in each sensing device all use the CC2530 control chip and its peripheral circuits.

8. A wireless fire alarm system based on ZigBee and OneNET cloud platform according to claim 1, characterized in that, The communication module is a wireless communication module.

9. A wireless fire alarm system based on ZigBee and OneNET cloud platform according to claim 8, characterized in that, The wireless communication module adopts a WIFI communication module, and the WIFI communication module adopts an ESP8266 WIFI communication chip and its peripheral circuits.

10. A wireless fire alarm system based on ZigBee and OneNET cloud platform according to claim 1, characterized in that, The temperature and humidity detection module uses a DHT11 type temperature and humidity sensor.

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