An intelligent interactive building fire alarm system

Abstract

The present invention discloses an intelligent interactive building fire alarm system, belonging to the field of security technology. The system comprises several fire alarm devices, wireless DTUs, and a personal computer. All fire alarm devices communicate with the wireless DTUs via a wireless network, and the wireless DTUs are connected to the personal computer via a serial port. This solves the technical problem of using a two-wire voice circuit to implement on-site communication in a fire alarm system. The present invention uses a two-wire system to connect all intercoms, which reduces wiring requirements and reduces costs. The present invention also uses wireless smoke and temperature integrated networked alarms to form an Internet of Things system, which simplifies wiring and is easy to install. The present invention provides on-site communication capabilities through intercoms, providing life support for people trapped in a fire scene.

Description

Technical Field

[0001] The present invention belongs to the field of security technology, and in particular relates to an intelligent interactive building fire alarm system. Background Art

[0002] An automatic fire alarm system, also known as a fire alarm system, is an automatic fire-fighting facility installed in buildings or other places in order to detect and report fires early and take effective measures in a timely manner, such as controlling and extinguishing fires.

[0003] Currently, most buildings, such as office buildings, hotels, and large shopping malls are equipped with fire alarm systems. However, traditional fire alarm systems can only provide simple fire alarm signals and cannot provide on-site call functions. At many fire scenes, a device that can provide on-site call functions is needed to help trapped people call for help. Summary of the Invention

[0004] The purpose of the present invention is to provide an intelligent interactive building fire alarm system, which solves the technical problem of using a two-wire voice circuit to realize on-site communication in a fire alarm system.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An intelligent interactive building fire alarm system includes several fire alarm devices, wireless DTUs and PCs. All fire alarm devices communicate with the wireless DTUs via a wireless network, and the wireless DTUs are connected to the PCs via a serial port.

[0007] The fire alarm system includes a main alarm, a sensor group, and several intercoms. The main alarm includes a power module, a sensor group, an MCU, a 433 module, and a full-power circuit. The sensor group includes several temperature and smoke sensors. All temperature and smoke sensors communicate with the MCU through the 433 module.

[0008] The 433 module communicates with the MCU via the SPI bus;

[0009] The power supply module includes a 3.3V voltage regulator and a 12V voltage regulator. The input end of the 12V voltage regulator is connected to an external 12V power supply, and the output end outputs 12V voltage;

[0010] The full-power circuit includes a power supply unit, a voltage switch, an echo cancellation circuit, a call signal acquisition circuit, an audio output circuit, and a power amplifier circuit. The power supply unit includes a 12V to 5V voltage regulator circuit composed of a voltage regulator IC12 and its peripheral circuits. The input end of the voltage regulator IC12 is connected to an external 12V power supply through a diode D1, and the output end outputs a 5V voltage through a diode D3 and a resistor R6.

[0011] The input of the 3.3V regulator is connected to a 5V voltage and the output outputs a 3.3V voltage;

[0012] The voltage switching switch includes a transistor Q4, a transistor Q3, a resistor R4, a resistor R17, a resistor R12, a resistor R19, a transistor Q5, a resistor R15, an LED lamp D7 and a resistor R13. The base of the transistor Q3 and the collector of the transistor Q4 are both connected to one end of the resistor R19, the other end of the resistor R19 is connected to the collector of the transistor Q5, the base of the transistor Q5 is connected to an IO port of the MCU through the resistor R15, the emitter of the transistor Q5 is connected to the ground wire, and the resistors R7 and R17 connected in parallel are connected between the emitter and base of the transistor Q4. The emitter of the transistor Q4 is connected to an external 12V power supply, the base of the transistor Q4 is connected to the emitter of the transistor Q3, the positive pole of the LED lamp D7 is connected to a 5V voltage, and the negative pole is connected to the collector of the transistor Q5 through the resistor R13;

[0013] The echo cancellation circuit includes an echo cancellation circuit composed of a transformer T1, a potentiometer W2, a capacitor C22 and a resistor R20. The audio signal is input through pin 1 of the resistor R20. Pin 1 of the transformer T1 is connected to pin 2 of the potentiometer W2, pin 3 is connected to pin 1 of the potentiometer W2, pin 2 is connected to the ground wire, pin 4 is the audio bus terminal, and pin 5 is connected to a 5V voltage. The collector of the transistor Q3 is also connected to pin 5 of the transformer T1. One end of the capacitor C22 is connected to pin 2 of the resistor R20, and the other end is connected to pin 3 of the potentiometer W2.

[0014] The audio output circuit includes an audio output circuit and a volume adjustment circuit. The audio output circuit is composed of a speaker SPK1 for sounding and a transformer T2 for amplifying audio signals. The volume adjustment circuit includes a resistor R19, a capacitor C21, a capacitor C25, a capacitor C24 and a potentiometer W3. Pin 2 of the potentiometer W3 is connected to pin 1 of the resistor R20, pin 1 is connected to the ground wire, and pin 3 is connected to the primary coil of the transformer T2 through an audio filter circuit composed of a resistor R19, a capacitor C21, a capacitor C25 and a capacitor C24. The secondary coil of the transformer T2 is connected to the speaker SPK1 through a filter circuit composed of a resistor R37, a capacitor C36, a capacitor C45 and a field effect transistor IC8.

[0015] The call signal acquisition circuit includes inductor L1, resistor R22, capacitor C27, optocoupler IC5, and resistor R23. One end of inductor L1 is connected to pin 4 of transformer T1, and the other end is connected to pin 1 of optocoupler IC5 through resistor R22. Pin 2 of optocoupler IC5 is connected to ground, pin 3 is connected to an IO port of the MCU, and pin 4 is connected to ground. Resistor R23 acts as a pull-up resistor for pin 3 of optocoupler IC5. Capacitor C27 is connected in parallel between pins 1 and 2 of optocoupler IC5.

[0016] The power amplifier circuit includes a control switch circuit and an audio power amplifier circuit. The audio power amplifier circuit is composed of a power amplifier chip IC10 and its peripheral circuits. The input end of the power amplifier chip IC10 is connected to the microphone MIC1 through a transformer T3, and the output end is connected to the input end of the control switch circuit.

[0017] The control switch circuit includes relay J5, diode D8, transistor Q6 and resistor R14. The emitter of transistor Q6 is connected to the ground wire, the base is connected to an IO port of the MCU through resistor R14, and the collector is connected to one end of the coil of relay J5. The other end of the coil of relay J5 is connected to a 5V voltage. The normally open contact of relay J5 is the input end of the control switch circuit, and the common end is connected to pin 3 of transformer T1.

[0018] Connect pin 4 of transformer T1 to pin 1 of connector J2, and pin 2 of connector J2 to ground.

[0019] The talker includes a connector J1, a button SW, an audio amplifier circuit, a constant current source circuit, a microphone MIC2, and a speaker circuit. Pin 1 of connector J1 is connected to pin 1 of connector J2, pin 2 is connected to the ground wire, and the button SW is connected between pins 3 and 4. Pin 1 of connector J1 is connected to pin 3, and pin 2 is connected to pin 4.

[0020] The speaker circuit includes a transformer T4 for amplifying audio and a speaker SPK2 for producing sound. Pin 3 of the transformer T4 is connected to pin 1 of the connector J1, and pins 1 and 2 are connected to the speaker SPK2.

[0021] The constant current source circuit is composed of transistor Q1, controllable precision voltage regulator IC1 and its peripheral circuits. The emitter of transistor Q1 is connected to the 5th pin of transformer T4 through resistor R1, and the collector is used to power the audio amplifier circuit.

[0022] The audio amplifier circuit is composed of audio amplifier IC2 and its peripheral circuits. Pin 2 of audio amplifier IC2 is connected to microphone MIC2 through resistor C14, and pin 5 is connected to the negative electrode of capacitor C12. The positive electrode of capacitor C12 is connected to pin 4 of transformer T4 through resistor R5.

[0023] The MCU and 433 module are powered by 3.3V voltage.

[0024] Preferably, the model of the MCU is S3C2410; the model of the 12V voltage regulator is a DC-DC12V voltage regulator; the model of the 3.3V voltage regulator is AM1117-3.3; the model of the 5V voltage regulator is LM7805; the model of the power amplifier chip IC10 is TDA2003; the model of the temperature and smoke sensor is BOLEESCH-620DHR integrated smoke and temperature network alarm; the model of the 433 module is AS07-M1101S; the model of the DTU is SX1278 / SX1276 wireless data transmission radio.

[0025] Preferably, the positive electrode of the capacitor C12 is further connected to the ground via a capacitor C13.

[0026] Preferably, the temperature and smoke sensor communicates with the 433 module via a 433 network, and the 433 module also communicates with the DTU via a 433 network.

[0027] The intelligent interactive building fire alarm system described in this invention solves the technical problem of using a two-wire voice circuit to implement on-site communication in fire alarm systems. The system uses a two-wire system to connect all intercoms, which reduces wiring and reduces costs. Furthermore, the system utilizes wireless smoke and temperature integrated networked alarms to form an Internet of Things system, simplifying wiring and facilitating installation. This system provides on-site communication via intercoms, providing life-saving protection for those trapped in a fire scene. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a system architecture diagram of the present invention;

[0029] Figure 2 It is a circuit diagram of the power supply unit, voltage switching switch, echo cancellation circuit, call signal acquisition circuit and audio output circuit of the present invention;

[0030] Figure 3 is a circuit diagram of a power amplifier circuit of the present invention;

[0031] Figure 4 It is a circuit diagram of the talker of the present invention. DETAILED DESCRIPTION

[0032] like Figures 1-4 The intelligent interactive building fire alarm system shown includes several fire alarm devices, wireless DTUs and PCs. All fire alarm devices communicate with the wireless DTUs via a wireless network, and the wireless DTUs are connected to the PCs via a serial port.

[0033] The present invention adopts fire alarm device, DTU, PC computer and 433 network to form the Internet of Things system architecture, realizing the functions of intelligent fire judgment and intelligent recording of historical fire alarm data.

[0034] The fire alarm system includes a main alarm, a sensor group, and several intercoms. The main alarm includes a power module, a sensor group, an MCU, a 433 module, and a full-power circuit. The sensor group includes several temperature and smoke sensors. All temperature and smoke sensors communicate with the MCU through the 433 module.

[0035] The 433 module communicates with the MCU via the SPI bus;

[0036] The power supply module includes a 3.3V voltage regulator and a 12V voltage regulator. The input end of the 12V voltage regulator is connected to an external 12V power supply, and the output end outputs 12V voltage;

[0037] The full-power circuit includes a power supply unit, a voltage switch, an echo cancellation circuit, a call signal acquisition circuit, an audio output circuit, and a power amplifier circuit. The power supply unit includes a 12V to 5V voltage regulator circuit composed of a voltage regulator IC12 and its peripheral circuits. The input end of the voltage regulator IC12 is connected to an external 12V power supply through a diode D1, and the output end outputs a 5V voltage through a diode D3 and a resistor R6.

[0038] The input of the 3.3V regulator is connected to a 5V voltage and the output outputs a 3.3V voltage;

[0039] The voltage switching switch includes a transistor Q4, a transistor Q3, a resistor R4, a resistor R17, a resistor R12, a resistor R19, a transistor Q5, a resistor R15, an LED lamp D7 and a resistor R13. The base of the transistor Q3 and the collector of the transistor Q4 are both connected to one end of the resistor R19, the other end of the resistor R19 is connected to the collector of the transistor Q5, the base of the transistor Q5 is connected to an IO port of the MCU through the resistor R15, the emitter of the transistor Q5 is connected to the ground wire, and the resistors R7 and R17 connected in parallel are connected between the emitter and base of the transistor Q4. The emitter of the transistor Q4 is connected to an external 12V power supply, the base of the transistor Q4 is connected to the emitter of the transistor Q3, the positive pole of the LED lamp D7 is connected to a 5V voltage, and the negative pole is connected to the collector of the transistor Q5 through the resistor R13;

[0040] The echo cancellation circuit includes an echo cancellation circuit composed of a transformer T1, a potentiometer W2, a capacitor C22 and a resistor R20. The audio signal is input through pin 1 of the resistor R20. Pin 1 of the transformer T1 is connected to pin 2 of the potentiometer W2, pin 3 is connected to pin 1 of the potentiometer W2, pin 2 is connected to the ground wire, pin 4 is the audio bus terminal, and pin 5 is connected to a 5V voltage. The collector of the transistor Q3 is also connected to pin 5 of the transformer T1. One end of the capacitor C22 is connected to pin 2 of the resistor R20, and the other end is connected to pin 3 of the potentiometer W2.

[0041] The audio output circuit includes an audio output circuit and a volume adjustment circuit. The audio output circuit is composed of a speaker SPK1 for sounding and a transformer T2 for amplifying audio signals. The volume adjustment circuit includes a resistor R19, a capacitor C21, a capacitor C25, a capacitor C24 and a potentiometer W3. Pin 2 of the potentiometer W3 is connected to pin 1 of the resistor R20, pin 1 is connected to the ground wire, and pin 3 is connected to the primary coil of the transformer T2 through an audio filter circuit composed of a resistor R19, a capacitor C21, a capacitor C25 and a capacitor C24. The secondary coil of the transformer T2 is connected to the speaker SPK1 through a filter circuit composed of a resistor R37, a capacitor C36, a capacitor C45 and a field effect transistor IC8.

[0042] The call signal acquisition circuit includes inductor L1, resistor R22, capacitor C27, optocoupler IC5, and resistor R23. One end of inductor L1 is connected to pin 4 of transformer T1, and the other end is connected to pin 1 of optocoupler IC5 through resistor R22. Pin 2 of optocoupler IC5 is connected to ground, pin 3 is connected to an IO port of the MCU, and pin 4 is connected to ground. Resistor R23 acts as a pull-up resistor for pin 3 of optocoupler IC5. Capacitor C27 is connected in parallel between pins 1 and 2 of optocoupler IC5.

[0043] The power amplifier circuit includes a control switch circuit and an audio power amplifier circuit. The audio power amplifier circuit is composed of a power amplifier chip IC10 and its peripheral circuits. The input end of the power amplifier chip IC10 is connected to the microphone MIC1 through a transformer T3, and the output end is connected to the input end of the control switch circuit.

[0044] The control switch circuit includes relay J5, diode D8, transistor Q6 and resistor R14. The emitter of transistor Q6 is connected to the ground wire, the base is connected to an IO port of the MCU through resistor R14, and the collector is connected to one end of the coil of relay J5. The other end of the coil of relay J5 is connected to a 5V voltage. The normally open contact of relay J5 is the input end of the control switch circuit, and the common end is connected to pin 3 of transformer T1.

[0045] Connect pin 4 of transformer T1 to pin 1 of connector J2, and pin 2 of connector J2 to ground.

[0046] The talker includes a connector J1, a button SW, an audio amplifier circuit, a constant current source circuit, a microphone MIC2, and a speaker circuit. Pin 1 of connector J1 is connected to pin 1 of connector J2, pin 2 is connected to the ground wire, and the button SW is connected between pins 3 and 4. Pin 1 of connector J1 is connected to pin 3, and pin 2 is connected to pin 4.

[0047] The speaker circuit includes a transformer T4 for amplifying audio and a speaker SPK2 for producing sound. Pin 3 of the transformer T4 is connected to pin 1 of the connector J1, and pins 1 and 2 are connected to the speaker SPK2.

[0048] The constant current source circuit is composed of transistor Q1, controllable precision voltage regulator IC1 and its peripheral circuits. The emitter of transistor Q1 is connected to the 5th pin of transformer T4 through resistor R1, and the collector is used to power the audio amplifier circuit.

[0049] The controllable precision voltage regulator IC1 is TL431.

[0050] The audio amplifier circuit is composed of audio amplifier IC2 and its peripheral circuits. Pin 2 of audio amplifier IC2 is connected to microphone MIC2 through resistor C14, and pin 5 is connected to the negative electrode of capacitor C12. The positive electrode of capacitor C12 is connected to pin 4 of transformer T4 through resistor R5.

[0051] The MCU and 433 module are powered by 3.3V voltage.

[0052] A main alarm is installed on each floor or two floors. All intercoms are located in the building. Each main alarm is connected to 5 to 10 intercoms. All temperature and smoke sensors are located in the building. Each main alarm communicates with 6 to 9 temperature and smoke sensors. All main alarms communicate with the DTU deployed in the community or building monitoring room through the 433 network. The DTU is connected to the PC through the serial port.

[0053] When a trapped person presses the SW button of the intercom, the SW button temporarily short-circuits pins 1 and 2 of connector J1, thereby short-circuiting pins 1 and 2 of connector J2. At this time, the call signal acquisition circuit cannot obtain 5V voltage through pin 4 of transformer T1, and the output signal of its output terminal pin 3 changes from level 1 to level 0. After receiving the digital signal change, the IO port of the MCU controls the base of the transistor Q5 to load a level 1 signal. At this time, the transistor Q5 is turned on, thereby turning on the transistor Q3. The 12V power supply is loaded to pin 5 of the transformer T1 through Q3, and then added through the coil of the transformer. The voltage is loaded to pin 4 of transformer T1, so that all intercoms connected to structure J2 receive a voltage of 12V. The MCU simultaneously controls transistor Q6 to conduct, thereby activating relay J5, so that the output end of the power amplifier chip IC10 is connected to pin 3 of transformer T1. That is, the audio signal output by the power amplifier chip IC10 can be loaded to pin 3 of transformer T1. At this time, the trapped person who presses the intercom button can directly communicate with the main alarm through the intercom. The present invention provides real-time on-site communication. The main alarm is installed at the building escape exit, which makes it convenient for firefighters to communicate with the intercom through the main alarm after arriving at the scene.

[0054] The echo cancellation circuit is used to eliminate the echo noise generated by the circuit. The echo can be eliminated by adjusting the potentiometer W2.

[0055] Potentiometer W3 can adjust the volume of speaker SPK1.

[0056] This embodiment uses an MCU to complete the control of transistors Q5 and Q6. A digital logic circuit can also be used to replace the function of the MCU. That is, an inverter is directly connected to pin 3 of the optocoupler IC5. When pin 3 of the optocoupler IC5 changes from level 1 to level 0, the output end of the inverter directly drives transistors Q5 and Q6 to turn on, thereby realizing the operation of the MCU.

[0057] This embodiment uses the BOLEESCH-620DHR smoke and temperature integrated network alarm, whose output signal is a 433 wireless signal, which does not require additional wiring and is easy to install.

[0058] When a smoke and temperature integrated network alarm sounds an alarm, the smoke and temperature integrated network alarm will send the alarm signal to the main alarm, the main alarm will send the alarm signal to the DTU, the DTU will send the alarm signal to the PC, and the PC will record the alarm event, thereby generating alarm history data for security personnel to view.

[0059] Preferably, the model of the MCU is S3C2410; the model of the 12V voltage regulator is a DC-DC12V voltage regulator; the model of the 3.3V voltage regulator is AM1117-3.3; the model of the 5V voltage regulator is LM7805; the model of the power amplifier chip IC10 is TDA2003; the model of the temperature and smoke sensor is BOLEESCH-620DHR integrated smoke and temperature network alarm; the model of the 433 module is AS07-M1101S; the model of the DTU is SX1278 / SX1276 wireless data transmission radio.

[0060] Preferably, the positive electrode of the capacitor C12 is further connected to the ground via a capacitor C13.

[0061] Preferably, the temperature and smoke sensor communicates with the 433 module via a 433 network, and the 433 module also communicates with the DTU via a 433 network.

[0062] The intelligent interactive building fire alarm system described in this invention solves the technical problem of using a two-wire voice circuit to implement on-site communication in fire alarm systems. The system uses a two-wire system to connect all intercoms, which reduces wiring and reduces costs. Furthermore, the system utilizes wireless smoke and temperature integrated networked alarms to form an Internet of Things system, simplifying wiring and facilitating installation. This system provides on-site communication via intercoms, providing life-saving protection for those trapped in a fire scene.

Claims

1. An intelligent interactive building fire alarm system, characterized by: It includes several fire alarm devices, wireless DTUs and PCs. All fire alarm devices communicate with the wireless DTUs via wireless networks, and the wireless DTUs are connected to the PCs via serial ports. The fire alarm system includes a main alarm and several intercoms. The main alarm includes a power module, a sensor group, an MCU, a 433 module, and a full-power circuit. The sensor group includes several temperature and smoke sensors. All temperature and smoke sensors communicate with the MCU through the 433 module. The 433 module communicates with the MCU via the SPI bus; The power supply module includes a 3.3V voltage regulator, a 5V voltage regulator and a 12V voltage regulator. The input end of the 12V voltage regulator is connected to an external 12V power supply, and the output end outputs 12V voltage; The full-power circuit includes a power supply unit, a voltage switch, an echo cancellation circuit, a call signal acquisition circuit, an audio output circuit, and a power amplifier circuit. The power supply unit includes a 12V to 5V voltage regulator circuit composed of a voltage regulator IC12 and its peripheral circuits. The input end of the voltage regulator IC12 is connected to an external 12V power supply through a diode D1, and the output end outputs a 5V voltage through a diode D3 and a resistor R6. The voltage regulator IC12 is a 5V voltage regulator. The input of the 3.3V regulator is connected to a 5V voltage and the output outputs a 3.3V voltage; The voltage switching switch includes a transistor Q4, a transistor Q3, a resistor R4, a resistor R17, a resistor R12, a resistor R19, a transistor Q5, a resistor R15, an LED lamp D7 and a resistor R13. The base of the transistor Q3 and the collector of the transistor Q4 are both connected to one end of the resistor R19, the other end of the resistor R19 is connected to the collector of the transistor Q5, the base of the transistor Q5 is connected to an IO port of the MCU through the resistor R15, the emitter of the transistor Q5 is connected to the ground wire, and the resistors R7 and R17 connected in parallel are connected between the emitter and base of the transistor Q4. The emitter of the transistor Q4 is connected to an external 12V power supply, the base of the transistor Q4 is connected to the emitter of the transistor Q3, the positive pole of the LED lamp D7 is connected to a 5V voltage, and the negative pole is connected to the collector of the transistor Q5 through the resistor R13; The echo cancellation circuit includes an echo cancellation circuit composed of a transformer T1, a potentiometer W2, a capacitor C22 and a resistor R20. The audio signal is input through pin 1 of the resistor R20. Pin 1 of the transformer T1 is connected to pin 2 of the potentiometer W2, pin 3 is connected to pin 1 of the potentiometer W2, pin 2 is connected to the ground wire, pin 4 is the audio bus terminal, and pin 5 is connected to a 5V voltage. The collector of the transistor Q3 is also connected to pin 5 of the transformer T1. One end of the capacitor C22 is connected to pin 2 of the resistor R20, and the other end is connected to pin 3 of the potentiometer W2. The audio output circuit includes an audio output circuit and a volume adjustment circuit. The audio output circuit is composed of a speaker SPK1 for sounding and a transformer T2 for amplifying audio signals. The volume adjustment circuit includes a resistor R19, a capacitor C21, a capacitor C25, a capacitor C24 and a potentiometer W3. Pin 2 of the potentiometer W3 is connected to pin 1 of the resistor R20, pin 1 is connected to the ground wire, and pin 3 is connected to the primary coil of the transformer T2 through an audio filter circuit composed of a resistor R19, a capacitor C21, a capacitor C25 and a capacitor C24. The secondary coil of the transformer T2 is connected to the speaker SPK1 through a filter circuit composed of a resistor R37, a capacitor C36, a capacitor C45 and a field effect transistor IC8. The call signal acquisition circuit includes inductor L1, resistor R22, capacitor C27, optocoupler IC5, and resistor R23. One end of inductor L1 is connected to pin 4 of transformer T1, and the other end is connected to pin 1 of optocoupler IC5 through resistor R22. Pin 2 of optocoupler IC5 is connected to ground, pin 3 is connected to an IO port of the MCU, and pin 4 is connected to ground. Resistor R23 acts as a pull-up resistor for pin 3 of optocoupler IC5. Capacitor C27 is connected in parallel between pins 1 and 2 of optocoupler IC5. The power amplifier circuit includes a control switch circuit and an audio power amplifier circuit. The audio power amplifier circuit is composed of a power amplifier chip IC10 and its peripheral circuits. The input end of the power amplifier chip IC10 is connected to the microphone MIC1 through a transformer T3, and the output end is connected to the input end of the control switch circuit. The control switch circuit includes relay J5, diode D8, transistor Q6 and resistor R14. The emitter of transistor Q6 is connected to the ground wire, the base is connected to an IO port of the MCU through resistor R14, and the collector is connected to one end of the coil of relay J5. The other end of the coil of relay J5 is connected to a 5V voltage. The normally open contact of relay J5 is the input end of the control switch circuit, and the common end is connected to pin 3 of transformer T1. Connect pin 4 of transformer T1 to pin 1 of connector J2, and pin 2 of connector J2 to ground. The talker includes a connector J1, a button SW, an audio amplifier circuit, a constant current source circuit, a microphone MIC2, and a speaker circuit. Pin 1 of connector J1 is connected to pin 1 of connector J2, pin 2 is connected to the ground wire, and the button SW is connected between pins 3 and 4. Pin 1 of connector J1 is connected to pin 3, and pin 2 is connected to pin 4. The speaker circuit includes a transformer T4 for amplifying audio and a speaker SPK2 for producing sound. Pin 3 of the transformer T4 is connected to pin 1 of the connector J1, and pins 1 and 2 are connected to the speaker SPK2. The constant current source circuit is composed of transistor Q1, controllable precision voltage regulator IC1 and its peripheral circuits. The emitter of transistor Q1 is connected to the 5th pin of transformer T4 through resistor R1, and the collector is used to power the audio amplifier circuit. The audio amplifier circuit is composed of audio amplifier IC2 and its peripheral circuits. Pin 2 of audio amplifier IC2 is connected to microphone MIC2 through resistor C14, and pin 5 is connected to the negative electrode of capacitor C12. The positive electrode of capacitor C12 is connected to pin 4 of transformer T4 through resistor R5. The MCU and 433 module are powered by 3.3V voltage.

2. The intelligent interactive building fire alarm system according to claim 1, characterized in that: The model of the MCU is S3C2410; the model of the 12V voltage regulator is a DC-DC12V voltage regulator; the model of the 3.3V voltage regulator is AM1117-3.3; the model of the 5V voltage regulator is LM7805; the model of the power amplifier chip IC10 is TDA2003; the model of the temperature and smoke sensor is BOLEESCH-620DHR integrated smoke and temperature network alarm; the model of the 433 module is AS07-M1101S; the model of the DTU is SX1278 / SX1276 wireless data transmission radio.

3. The intelligent interactive building fire alarm system according to claim 1, characterized in that: The positive electrode of the capacitor C12 is also connected to the ground line through a capacitor C13.

4. The intelligent interactive building fire alarm system according to claim 1, characterized in that: The temperature and smoke sensor communicates with the 433 module via the 433 network, and the 433 module also communicates with the DTU via the 433 network.

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