CN221151392U - Multifunctional internet of things security circuit - Google Patents

Abstract

The utility model belongs to the technical field of communication equipment of the Internet of things, in particular to a multifunctional security circuit of the Internet of things, which comprises a WIFI communication circuit, a silicon controlled rectifier alternating current mains supply single-phase switch circuit, a relay alternating current mains supply single-phase switch circuit, a photosensitive/sound control/human body pyroelectric sensor input circuit, an illuminating lamp light touch key switch circuit, an isolated switch power supply circuit, a DC-DC voltage reduction circuit and a WIFI communication circuit, wherein the WIFI communication circuit is used as a control processor and is the core of the whole circuit, the silicon controlled rectifier alternating current mains supply single-phase switch circuit is used as a medium to control the work of an illuminating lamp, and the relay alternating current mains supply single-phase switch circuit is also used as the medium. The utility model has the advantages of low cost, strong practicability, no maintenance and the like, integrates multiple functions, realizes remote monitoring and intelligent control, meets multiple requirements of home security and ensures the stability and reliability of equipment.

Description

Multifunctional internet of things security circuit

Technical Field

The utility model relates to the technical field of communication equipment of the Internet of things, in particular to a multifunctional security circuit of the Internet of things.

Background

Along with the rapid development of technology, the technology of internet of things has gradually been integrated into aspects of our daily life, however, although the prior art has been quite mature, most devices still have only a single function, such as a voice control switch, only one function, or only provide charging services, such as a USB mobile phone charger, and the devices with the single functions limit our use experience to a certain extent, so that we need a device capable of integrating multiple functions into one, thereby meeting the ever-increasing user demands.

Patent document CN206805217U discloses an intelligent security sensor, "including MCU controller, power supply circuit, signal output circuit, first sensor, the second sensor, memory circuit and communication circuit connect the MCU controller respectively, first sensor and second sensor become certain contained angle setting, have reached the effective detection and the feedback to the human existence or the quantity variation in the closed room", but this intelligent security sensor mainly is the effective detection and the feedback to the human existence or the quantity variation in the closed room, do not consider to combine into a whole with multiunit function and use, limited the use of security circuit to a certain extent.

Disclosure of Invention

The utility model aims to provide a multifunctional internet of things security circuit to solve the technical problem that the background technology provides a plurality of functions integrated into a whole.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the realized functional content comprises an Internet security system, an Internet fixed-point timing household appliance wireless control, a sound control/human body heat release induction lighting lamp, a USB2.0 mobile phone charging, an anti-theft alarm, a tact lighting lamp switch LED indicator lamp/breathing lamp, a contact type temperature (body temperature) measurement, a used circuit comprises a WIFI communication circuit, a silicon controlled rectifier alternating current mains supply single-phase switch circuit, a relay alternating current mains supply single-phase switch circuit, a photosensitive/sound control/human body heat release sensor input circuit, a lighting lamp tact key switch circuit, an isolated switch power circuit and a DC-DC voltage reducing circuit, wherein the WIFI communication circuit takes an (MCU ESP 8285) ESP8285-S module as a core, namely, a control processor, a communicator and an Internet of things control platform wireless connection, and can control +12V ringing alarm to work, and is the core of the whole circuit, the controllable silicon alternating current commercial power single-phase switch circuit is in wireless connection with the control platform of the Internet of things through the WIFI communication circuit, the lighting lamp can be controlled to be turned on and off, the relay alternating current commercial power single-phase switch circuit is in wireless connection with the control platform of the Internet of things through the WIFI communication circuit, the high-power household appliances can be controlled, the photosensitive/sound-controlled/human body heat release sensor input circuit is electrically connected with the WIFI communication circuit, the photosensitive/sound-controlled/human body heat release sensor input circuit outputs the sound control circuit electric signal, the heat release infrared sensor electric signal, the photosensitive sensor electric signal is judged through the WIFI communication circuit (MCU controller ESP 8285), the controllable silicon alternating current commercial power single-phase switch circuit controls the lighting lamp to be turned on, the output digital temperature sensor electric signal is analyzed through the WIFI communication circuit to obtain temperature information, uploading to an Internet of things control platform, wherein the lighting lamp light touch key switch circuit is electrically connected with the WIFI communication circuit, the lighting lamp switch can be physically controlled, an LED lamp of the lighting lamp light switch plays a role of an indicator lamp, the output voltage of the isolation type switch power supply circuit is +12V, the whole circuit is powered, the DC-DC voltage reduction circuit reduces +12V voltage output by the isolation type switch power supply circuit, the charging voltage of the mobile phone is obtained, and the charging voltage of the mobile phone is output through USB2.0 in the photosensitive/sound control/human body pyroelectric sensor input circuit.

Preferably, the WIFI communication module that the WIFI communication circuit used is ESP8285-S, and internet security protection system includes that pyroelectric infrared sensor A312 and WIFI communication circuit constitute human induction circuit, through WIFI communication module and thing networking control platform wireless connection, and the WIFI communication circuit can make the high decibel alarm of 12V electron sound of intermittently through controlling a triode simultaneously.

Preferably, the single-phase switching circuit of the alternating current mains supply of the controllable silicon outputs a normally-open/timed high-low level by an ESP8285 (MCU controller), and the controllable silicon is controlled to be turned on and off, so that the lighting lamp is turned on and off.

Preferably, the relay alternating current commercial power single-phase switch circuit is wirelessly connected with the control platform of the internet of things by utilizing the WIFI communication module, and controls (MCU controller) ESP8285 to output high-low level with fixed-point timing, so that the relay is enabled to be in on-off operation, namely, the high-power electric appliance is controlled to work (such as socket).

Preferably, the photosensitive/sound control/human body pyroelectric sensor input circuit outputs an induction electric signal to the WIFI communication circuit through the human voice detection circuit formed by the MIC microphone and the voltage comparator LM393 and the human body induction circuit formed by the pyroelectric infrared sensor AS312, the WIFI communication circuit judges the brightness of the current ambient light according to the photosensitive diode electric signal detected by the (ADC), and controls the silicon controlled ac mains supply single-phase switch circuit to turn on and off the lighting lamp, meanwhile, the connecting end of the digital temperature sensor probe is made into a USB2.0 interface and a USB2.0 side socket, so that the DS18B20 digital temperature sensor and the WIFI communication circuit are electrically connected to generate communication, and the temperature on the DS18B20 digital temperature sensor is read.

Preferably, the light touch key switch circuit provides key position indication for the touch keys through an LED and provides operation indication of various functional operations, and has the effect of breathing the lamp, and the light touch keys are electrically connected with the WIFI communication circuit, so that the physical switch function of the light is realized.

Preferably, the isolated switching power supply circuit is composed of a core chip, namely a low-power consumption primary side feedback (PSR) switching power supply chip FM2541S, and is an isolated high-efficiency low-power consumption switching power supply with the maximum power of 18W, and reliable +12V power supply is provided for the whole circuit.

Preferably, the DC-DC voltage reducing circuit is composed of a core chip-voltage reducing type direct current power supply converter chip XL1509-5.0E1, a voltage reducing circuit outputting a maximum current of 2A and an output voltage of +5v, and finally, the voltage reducing circuit is output by a USB2.0 side socket in a photosensitive/acoustic control/human body pyroelectric sensor input circuit.

Compared with the prior art, the utility model has the beneficial effects that:

1. The utility model has the advantages of low cost, strong practicability, no maintenance and the like, and more importantly, the utility model can integrate multiple functions into a whole, realize multiple functions such as remote monitoring, intelligent control, voice control, data transmission and the like, thereby meeting multiple requirements of household security and practical function services, adopting the advanced Internet of things technology, realizing the interconnection of everything, leading the household security and practical function services to be more intelligent, efficient and reliable, adopting the advanced circuit design technology, ensuring the stability and reliability of the equipment, ensuring the safe and reliable use of users, meeting multiple requirements of the household security and practical function services, greatly improving the efficiency and quality of the household security and practical function services, and simultaneously leading the common people to enjoy the inexpensive and reliable household security and practical function services.

Drawings

FIG. 1 is a schematic diagram of a circuit board according to the present utility model;

FIG. 2 is a schematic workflow diagram of the present utility model;

fig. 3 is a schematic diagram of a WIFI communication circuit according to the present utility model;

FIG. 4 is a schematic diagram of the input circuit of the photosensitive/voice-controlled/human body pyroelectric sensor of the present utility model;

FIG. 5 is a schematic diagram of a circuit configuration of a touch key switch of an illumination lamp according to the present utility model;

FIG. 6 is a schematic diagram of a single-phase switch circuit of a SCR AC mains supply according to the present utility model;

FIG. 7 is a schematic diagram of a relay AC mains single-phase switch circuit configuration according to the present utility model;

FIG. 8 is a schematic diagram of a DC-DC step-down circuit according to the present utility model;

fig. 9 is a schematic diagram of an isolated switching power supply circuit according to the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1-9, an embodiment of the present utility model is provided: the multifunctional internet of things security circuit comprises a WIFI communication circuit, a silicon controlled rectifier alternating current mains supply single-phase switch circuit, a relay alternating current mains supply single-phase switch circuit, a photosensitive/sound control/human body pyroelectric sensor input circuit, an illuminating lamp light touch key switch circuit, an isolation type switch power supply circuit, a DC-DC voltage reduction circuit, wherein main electronic elements of the silicon controlled rectifier alternating current mains supply single-phase switch circuit are a photoelectric coupler CT3023 and a silicon controlled rectifier BT136, the illumination lamp is controlled to be turned on and off by a (MCU controller) ESP8285 output timing/normally-on high-low level electric signal, the switch circuit is combined with the WIFI communication circuit, the states of a microphone and a pyroelectric infrared sensor are read, and the photosensitive sensor data are combined, the function of the sound control/human body pyroelectric induction illuminating lamp is achieved, the DC-DC voltage reduction circuit is composed of a main electronic element-voltage reduction type direct current power supply converter chip XL1509-5.0E1, and the maximum current 2A, the output voltage +5V DC-DC voltage reduction circuit provides 10W charging voltage for a USB2.0 mobile phone charging function.

The WIFI communication circuit takes an MCU ESP8285 controller ESP8285-S module as a whole circuit core, processes received electric signals of each sensor, sends control electric signals, is used as a WIFI transceiver wireless module to be connected with an Internet of things control platform, comprises the ESP8285-S module, a module peripheral circuit, a module power supply circuit and a sounding alarm control circuit, achieves the electric signal processing of the sensor and the communication effect with the Internet of things control platform, and enables a +12V electronic high decibel alarm to sound intermittently through a triode by the aid of high-low electric signals output by the MCU controller ESP8285, so that the function of the anti-theft alarm is achieved.

The WIFI communication circuit takes an (MCU ESP 8285) ESP8285-S module as a core, and is used as a control processor and a communicator to be connected with an Internet of things control platform in a wireless mode to be connected with each circuit. The controllable silicon alternating current commercial power single-phase switch circuit is electrically connected with the WIFI communication circuit, the function of the voice control/human body pyroelectric induction illuminating lamp is achieved, the WIFI communication circuit is in wireless connection with the control platform of the Internet of things, and the function of Internet remote control is achieved. The relay alternating current commercial power single-phase switch circuit is in wireless connection with the control platform of the Internet of things through the WIFI communication circuit, and the function of wireless control of the household appliances at fixed points and timing of the Internet is achieved. The photosensitive/sound control/human body pyroelectric sensor input circuit is electrically connected with the WIFI communication circuit, and each sensor electric signal is sent to the WIFI communication circuit through the photosensitive/sound control/human body pyroelectric sensor input circuit and is electrically connected with the DC-DC voltage reduction circuit, so that the USB2.0 mobile phone charging function is realized. The light touch key switch circuit is electrically connected with the WIFI communication circuit, and functions of a light touch light switch and a light touch light switch LED indicator lamp/breathing lamp are achieved. The isolated switching power supply circuit supplies power to the whole circuit. The DC-DC step-down circuit is electrically connected with the isolated switching power supply circuit, outputs mobile phone charging voltage through the USB2.0 female seat, achieves USB2.0 mobile phone charging function, makes the connecting end of the stainless steel waterproof DS18B20 digital temperature sensor probe into a USB2.0 interface to be connected with the USB2.0 side female seat, and the DS18B20 digital temperature sensor is electrically connected with the WIFI communication circuit through the digital temperature sensor input circuit, reads the temperature on the DS18B20 digital temperature sensor, and achieves the contact type temperature (body temperature) measurement function.

The WIFI communication circuit reads the state of the pyroelectric infrared sensor A312 through the (MCU controller) ESP8285 and is connected with the Internet of things platform to form an Internet security system, the (MCU controller) ESP8285 outputs high-low level electric signals, and the +12V electronic high-decibel alarm is enabled to sound intermittently through a triode, so that the function of the anti-theft alarm is achieved. The circuit comprises an ESP8285-S module, a module peripheral circuit, a module power supply circuit and a sounding alarm control circuit.

The single-phase switch circuit of the alternating current mains supply of the silicon controlled rectifier is controlled by a high-low level electric signal which is output by an ESP8285 (MCU controller) and is timed/normally on, the silicon controlled rectifier BT136 is conducted through a photoelectric coupler CT3023, the lighting lamp obtains the alternating current mains supply, and the lighting lamp is lighted.

The relay AC mains supply single-phase switch circuit is controlled by a (MCU controller) ESP8285 output fixed-point timing high-low level electric signal, and a triode is used for enabling the relay to obtain +12V power supply and closing, so that AC mains supply is provided for high-power household appliances.

The input circuit of the photosensitive/sound-controlled/human body pyroelectric sensor outputs an electric signal which is sensed by the human body sensing circuit which is composed of a MIC microphone and a voltage comparator LM393 and a human body sensing circuit which is composed of a pyroelectric infrared sensor AS312 to be sent to the WIFI communication circuit, the WIFI communication circuit judges the brightness of the current ambient light according to the electric signal of the photosensitive diode which is detected by An (ADC), when the current ambient light reaches a set certain threshold value, the illumination lamp is controlled to be lightened through a silicon-controlled alternating current mains supply single-phase switch circuit, the charging voltage of a mobile phone which is sent by a DC-DC voltage reducing circuit is outputted through a USB2.0 mother seat in the input circuit of the photosensitive/sound-controlled/human body pyroelectric sensor, the electric signal which is sent to the WIFI communication circuit through a DS18B20 digital temperature sensor is used for obtaining temperature data, and the temperature data is uploaded to the control platform of the Internet of things. The photosensitive/sound control/human body heat release sensor input circuit comprises: an ambient light acquisition (photosensitive sensor input) circuit, an intelligent pyroelectric infrared sensor circuit, a sound control (MIC microphone input) circuit and a temperature/body temperature detection (digital temperature sensor input) circuit.

The light touch key switch circuit provides key position indication for the touch keys through an LED, provides operation indication of various functional operations, has the effect of a breathing lamp, and realizes the physical switch function of the light through the electric connection of a key and the WIFI communication circuit.

The isolated switching power supply circuit consists of a core chip, namely a low-power consumption primary side feedback (PSR) switching power supply chip FM2541S, and is an isolated high-efficiency switching power supply which outputs the maximum power of 18W and provides a reliable +12V power supply for the whole circuit.

The DC-DC voltage reducing circuit consists of a core chip, namely a voltage reducing type direct current power supply converter chip XL1509-5.0E1, a voltage reducing circuit which outputs a maximum current of 2A and an output voltage of +5V, and finally, the voltage reducing circuit is output by a USB2.0 side socket in a photosensitive/sound control/human body pyroelectric sensor input circuit.

WIFI communication circuit (fig. 2):

The WIFI communication module ESP8285-S has the following working modes:

Power supply pin (VCC): CN12 power supply socket sends 12V voltage, sends to voltage stabilizing chip AMS1117-3.3V 3 rd pin through current limiting resistor R35, AMS1117-3.3V 2 nd, 4 foot output a 3.3V voltage to WIFI communication module ESP 8285-S8 th pin, C21 is filter capacitor, C15, C16 are anti-interference electric capacity.

Reset leg (RES): and a delay reset circuit is formed by R37 and C19, and the delay reset circuit is sent to the 1 st pin of the WIFI communication module ESP8285-S, and is reset at a low level.

Enable pin (EN): the supply voltage 3.3V provides a high level for pin 3 of ESP8285-S through pull-up resistor R36. The pin high enables the operating mode and the low module power is turned off.

GPIO 0 (operation mode selection): the supply voltage 3.3V provides a high level through pull-up resistor R27 for ESP8285-S pin 12, which is floating or high: flashboot, operating mode; the foot low level: UARTDownload download mode.

GPIO 15: the leg is connected to a pull-down resistor R26. The pin fails to start at high level.

Summarizing: the voltage of the pins is normal, the voltage of the GPIO 2 pin is not pulled down, and the WIFI communication module ESP8285-S can enter a normal working mode.

Audible alarm control circuit (burglar alarm function):

r25, R28, R34, R35, R38 are current limiting resistors.

GPIO 5 works in Output mode (Output mode), and forms an alarm circuit with R25, Q6, R34, +12V power supply, CN11 socket and +12V alarm.

The WIFI communication module ESP8285-S outputs high level from the GPIO 5 pin through an internal software program, and controls the Q6 to be saturated and turned on, so that a 12V alarm sounds to show an alarm.

Key and indicator light circuit input circuit (light switch and light switch LED indicator/breathing light function):

GPIO 2 operates in Output mode (Output mode) and is connected to pin 2 of the U5-2 socket (LED 3 negative) on the key/indicator panel (FIG. 5) through R32 and pin 2 of the U5 socket.

The +3.3V power supply is connected with the 3 rd pin of the U5 socket by R28, and then is connected with the 3 rd pin (the positive electrode of the LED 3) of the U5-2 socket on the key/indicator light panel (figure 5) to form an indicator light circuit.

GPIO 4 is operated in Input mode (Input mode) to supply power with +3.3V, R29 is connected to pin 4 of U5 socket, and then to pin 4 (key pin) of U5-2 socket on key/indicator panel (figure 5). And the 1 st pin of the U5 socket is Grounded (GND) to form a key input circuit.

Relay alternating current commercial power single-phase switch circuit (internet fixed-point timing household appliance wireless control function):

GPIO 15 works in Output mode (Output mode), and is connected with the 2 nd pin of U10-1 socket to the 2 nd pin of U10-2 socket of relay AC mains supply single-phase switch board (figure 7), through R57, Q18 is saturated to be conducted, and the relay is driven to be attracted.

The 1 st pin of the U10-1 socket is a +12V power supply pin and is connected with the 1 st pin of the U10-2 on the relay alternating current mains supply single-phase switch board.

The 3 rd and 4 th pins of the U10-1 socket are ground pins (GND) and are connected with the 3 rd and 4 th pins of the U10-2 socket on the relay alternating current mains supply single-phase switch board.

R57, C40, Q18, D7, RLY1 (relay) constitute a relay driving circuit.

R57 is a current limiting resistor, C4 is a delay capacitor, and a short delay is needed because a short high level voltage is generated when the power-on device is started, and the +12V power supply voltage is pulled down. D7 is a freewheeling diode. C41, R58 is the relay contact RC snubber circuit. L+ and L-are input end and output end of single-phase alternating current commercial power (fire wire).

The WIFI communication module ESP8285-S outputs a high-level signal with fixed point timing from the GPIO 15 pin through an internal software program to control the closing of the relay.

Silicon controlled rectifier alternating current commercial power single-phase switch circuit (sound control/human body pyroelectric induction lighting lamp function):

GPIO 0 works in an Output mode (Output mode), is connected with a pull-up resistor R27, +3.3V power supply to the 2 nd pin of a U11 socket, is connected to the 2 nd pin of a U11-2 socket of a silicon controlled rectifier alternating current mains supply single-phase switch board (figure 6), and drives a U16 optocoupler CT3023 (S) (T1) through R56 and Q16 to enable a surface mounted silicon controlled rectifier BT136S-800E and a plug-in silicon controlled rectifier (BT 136-600D/DG, 127) to be conducted.

The 1 st pin of the U11 socket is a +3.3V power supply pin which is connected with the 1 st pin on the U11-2 socket.

The 3 rd and 4 th pins of the U11 socket are ground pins (GND) and are connected with the 3 rd and 4 th pins of the U11-2 socket.

R55, R56 and Q16 form a driving circuit, and R55 and R56 are current limiting resistors. Optocoupler CT3023 (S) (T1), R15, R53, SMD (surface mounted device) BT136S-800E, and plug-in (BT 136-600D/DG, 127) form an alternating current mains supply switch circuit. R15 is a current limiting resistor, R53 is a pull-down resistor, and R54 and C22 form an RC absorption circuit. L+ and L-are input end and output end of single-phase alternating current commercial power (fire wire).

Working principle: the WIFI communication module ESP8285-S outputs a timing/normally-on high-level signal from the GPIO 0 pin through an internal software program to control the conduction of the silicon controlled rectifier.

Ambient light acquisition (photosensitive sensor input) circuit:

The ADC is in Analog input mode (Analog mode), is connected with the 5 th pin of the X2 socket, and is connected with the 5 th pin of the X1-2 socket of the photosensitive/sound control/human body heat release sensor input circuit (figure 4).

And R8, R9 and C6, and the LED1 photosensitive diode SGPD and 5051C9 are connected with the 5 th pin of the X1-2 socket to form an ambient light acquisition circuit. R8 and R9 are voltage dividing resistors, and C6 is an anti-interference capacitor.

The ADC pins of the WIFI communication module ESP8285-S receive the photosensitive electric signals sent by the ambient light acquisition circuit and convert the photosensitive electric signals into digital electric signals recognized by the chip, so that the brightness and darkness of the current ambient light are judged.

Intelligent pyroelectric infrared sensor circuit (internet security system function):

GPIO 13 operates in Input mode (Input mode), connects to pin 6 of the X2 socket, and connects to pin 6 of the X1-2 socket of the photo/acoustic control/human body heat release sensor Input circuit (FIG. 4).

R3, C5, U1 (3.3V voltage stabilizing chip) HX7133, C3, C4, CGQ1 (Senba PIR digital intelligent pyroelectric infrared sensor) AS312, R5, Q2, R7 form a pyroelectric infrared sensing circuit. R3 is a current limiting resistor, C4 and C5 are anti-interference capacitors, C3 is a filter capacitor, R5 is a current limiting resistor, and R7 is a collector bias resistor.

The U1 is used for stabilizing voltage, high-precision stable +3.3V power supply voltage is obtained and is supplied to a1 st pin (VDD) of the CGQ1 sensor, a3 rd pin (VSS) of the CGQ1 sensor is Grounded (GND), a2 nd pin (REL) of the CGQ1 sensor is a sensor output pin, when a sensor detects a person, a high level is output from the 2 nd pin, R5 is passed through the base electrode of the triode Q2, the Q2 is saturated and conducted to enable a 6 th pin of an X1-2 socket to receive a low level signal, and the low level signal is sent to a GPIO 13 pin of an ESP8285-S of the WIFI communication module, so that the existence of the person is judged.

The U1 is independently powered to ensure that the CGQ1 sensor is not interfered by power supply fluctuation, and the judgment is more accurate.

Sound control (MIC microphone input) circuit:

GPIO 16 operates in an Input mode (Input mode),

Is connected with the 4 th pin of the X2 socket and is connected with the 4 th pin of the X1-2 socket of a photosensitive/sound control/human body pyroelectric sensor input circuit (figure 4).

MIC3 high sensitivity capacitive electret microphone GMI9767P-52db, r11, r20, r12, c8, c9, r19, q3 constitutes microphone sound amplifying circuit, which is fed to pin 2 (negative input) of U2.1 voltage comparator LM 393. C8 is anti-interference capacitance, C9 is coupling capacitance, R11, R12 are voltage dividing resistance, R19, R20 are bias resistance, R13, R14 are voltage dividing resistance, and the divided voltage is sent to the 2 nd pin (positive input) of the U2.1 voltage comparator LM 293. Modifying the R13 or R14 resistance value is equal to modifying the microphone sound sensitivity. By comparing the voltages of pins 2 and 3 of U2.1, a high level or a low level is obtained from pin 1, and R21 is a pull-up resistor.

R77, R16, R17, R18, D3, C10, R22, U2.2 constitute a delay voltage comparator circuit. The U2.2 pin 7 outputs the comparison voltage to the X1-2 socket pin 4. R15, R16, R17 and R18 are voltage dividing resistors, D3 is an isolation diode, R22 is a pull-up resistor, C7 is an energy storage capacitor, C12 is an anti-interference capacitor, and delay time can be changed by modifying the capacity of C10.

When speaking into an electret microphone MIC3, the change in sound causes a change in voltage across the microphone. This varying voltage is coupled to the Q3 base through C9, causing the Q3 collector voltage to vary, and when the voltage on the collector is lower than the voltage at pin 3 of U2.1, pin 1 of U2.1 outputs a low voltage, which pulls pin 5 of U2.2 low through the D3 diode, causing pin 7 of U2.2 to output a low voltage. After the speaking sound disappears, the U2.1 foot 1 outputs high-level voltage, and because of the existence of C10, the U2.2 foot 5 voltage is not higher than the U2.2 foot 6 voltage immediately, so that the U2.2 foot 7 voltage can be overturned after a period of time delay, the WIFI communication module ESP8285-S is ensured to have enough time to detect the sound control electric signal, and the sound control function is realized.

The sound control (MIC microphone input) circuit, the intelligent pyroelectric infrared sensor circuit, the ambient light acquisition (photosensitive sensor input) circuit and the WIFI communication module ESP8285-S are combined, the WIFI communication module ESP8285-S outputs a timing/normally-open high-level signal, and the silicon controlled rectifier alternating current commercial power single-phase switch circuit is controlled, so that the illuminating lamp is lightened, and the sound control/human body pyroelectric induction illuminating lamp function is realized.

Temperature/body temperature detection (digital temperature sensor input) circuit: (FIG. 4)

The power end of the DS18B20 digital temperature sensor is connected with the 2 nd pin (D-) of the USB1 (AF10.0HC63) USB2.0 interface female seat.

The signal end of the DS18B20 digital temperature sensor is connected with the 3 rd pin (D+) of the USB1 (AF10.0HC63) USB2.0 interface female seat.

The ground end of the DS18B20 digital temperature sensor is connected with the 4 th pin (GND) of the USB1 (AF10.0HC63) USB2.0 interface female seat.

R1 is a current limiting resistor, Q1 is a switching triode, and R1 and Q1 form a DS18B20 power supply control circuit. The 2 nd pin of the X1-2 socket is connected with the 2 nd pin of the X2 socket (figure 3) and is connected to the GPIO 12 pin of the WIFI communication module ESP8285-S through R33 (current limiting resistor).

(Fig. 4) R10 is a pull-up resistor, and pin 3 (d+) of the USB1 (AF10.0HC63) USB2.0 interface socket is connected with pin 3 of the X2 socket (fig. 3) through pin 3 of the X1-2 socket, and then is connected with pin 14 of GPIO of WIFI communication module ESP 8285-S.

The GPIO 12 pin of the WIFI communication module ESP8285-S operates in Output mode (Output mode).

The GPIO 14 pin of the WIFI communication module ESP8285-S works in an Input mode (Input mode), when the temperature/body temperature detection circuit works, the GPIO 12 pin outputs a low level to enable Q1 to be saturated and conducted, DS18B20 obtains a power supply voltage to start working, and the GPIO 14 pin receives a single bus data electric signal sent by DS18B20, so that temperature information on a current digital temperature sensor is obtained.

After the DS18B20 digital temperature sensor is pulled out, the GPIO 14 pin does not detect a temperature signal, and a software program in the WIFI communication module ESP8285-S controls the GPIO 12 pin to output a high level so as to cut off Q1.

When the plug-in mobile phone is charged, the 2 nd pin (D-) of the USB1 (AF10.0HC63) USB2.0 interface socket is not powered by the Q1 in the off state. The 3 rd pin (D+) of the USB1 (AF10.0HC63) USB2.0 interface mother seat is connected with the GPIO 14 pin of the WIFI communication module ESP8285-S, and the highest withstand voltage of the GPIO 14 pin is +5V, so that no influence is generated.

Isolated switching power supply circuit (fig. 9):

A low-power consumption primary side feedback (PSR) isolation type high-efficiency switching power supply taking FM2541S as a core is basically manufactured according to a data manual provided by a chip FM2541, and the working principle is not described any more for the prior art. The output voltage of the switching power supply is +12V, and the maximum power is 18 watts.

One path of +12V voltage is sent to the WIFI communication circuit through the CN18 socket.

One path of +12V voltage is sent to the DC-DC step-down circuit through the CN1 socket.

DC-DC step-down circuit (USB 2.0 cell phone charging function) (fig. 8):

The +5V step-down circuit with the DC-DC power supply chip XL1509-5.0E1 as a core is basically manufactured according to a data manual provided by the chip XL 1509-5.0E1. The output voltage is +5V, the maximum output current is 2A, namely the maximum charging power of the mobile phone is 10W.

The CN21 socket is a 12V voltage input end, and the CN22 socket is a +5V output end. The CN22 socket is connected with the CN3 socket (shown in figure 4) and then connected to the 4 th pin (GND) of the USB2.0 interface mother seat and the 1 st pin (VCC) of the USB2.0 interface mother seat, C1 is an anti-interference capacitor, and D15 is a voltage stabilizing diode for preventing 5V voltage from being too high.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (8)

1. Multifunctional internet of things security circuit, its characterized in that: the LED lamp voltage-reducing circuit comprises a WIFI communication circuit, a relay alternating current mains supply single-phase switch circuit, a photosensitive/sound-controlled/human body heat release sensor input circuit, a lighting lamp light touch key switch circuit, an isolated switch power supply circuit and a DC-DC voltage reduction circuit, wherein the WIFI communication circuit takes an MCU ESP8285 ESP8285-S module as a core, namely, the MCU ESP8285-S module is used as a control processor, the WIFI communication circuit is also used as a wireless connection of a communicator and an Internet of things control platform, a +12V ringing alarm can be controlled to work and is the core of the whole circuit, the relay alternating current mains supply single-phase switch circuit is used as a medium and is electrically connected with the MCU controller ESP8285 to control a lighting lamp to work, the relay alternating current mains supply single-phase switch circuit is also used as a medium and is electrically connected with the MCU controller ESP8285 to control a high-power household electrical appliance to work, the photosensitive/human body heat release sensor input circuit is connected with a MIC head, a digital heat release infrared sensor is used as a digital temperature sensor, a medium between the ESP controller and the ESP8285, each sensor is further used as a medium for being connected with the controller 8285, the ESP is electrically connected with the controller, the voltage reduction circuit is used as a light voltage reduction circuit, the LED lamp voltage-reducing circuit is electrically connected with the LED lamp voltage-reducing circuit to be used as a direct current voltage of the LED lamp, and the LED lamp voltage-isolating circuit is electrically connected with the LED lamp voltage-isolating circuit to the LED lamp.

2. The multi-functional internet of things security circuit of claim 1, wherein: the WIFI communication circuit takes an MCU ESP8285 controller ESP8285-S module as a whole circuit core, processes received electric signals of each sensor, sends control electric signals, is used as a WIFI receiving and transmitting wireless module to be connected with an Internet of things control platform, comprises the ESP8285-S module, a module peripheral circuit, a module power supply circuit and a sounding alarm control circuit, achieves the electric signal processing of the sensor and the communication function with the Internet of things control platform, and enables a +12V electronic high decibel alarm to sound intermittently through a triode by means of high-low electric signals output by the MCU controller ESP8285, so that the function of the anti-theft alarm is achieved.

3. The multi-functional internet of things security circuit of claim 1, wherein: main electronic elements of the silicon controlled rectifier alternating current commercial power single-phase switch circuit are a photoelectric coupler CT3023 and a silicon controlled rectifier BT136, the lighting lamp is controlled to be turned on and off by a high-low level electric signal which is output by an MCU controller ESP8285 and is timed/normally on, the state of the MIC microphone and the state of a pyroelectric infrared sensor are read by combining with a WIFI communication circuit, and the function of the voice control/human body pyroelectric induction lighting lamp is realized by combining with photosensitive sensor data.

4. The multi-functional internet of things security circuit of claim 1, wherein: the main electronic element of the relay AC mains supply single-phase switch circuit is HF32F-G/012-HS, and is controlled by the high-low level electric signal of the fixed point timing output by the MCU controller ESP8285, thereby providing AC mains supply for high-power electric appliances and realizing the function of wireless control of the household appliances with fixed point timing of the Internet.

5. The multi-functional internet of things security circuit of claim 1, wherein: the photosensitive/sound control/human body heat release sensor input circuit comprises: the intelligent temperature sensor comprises an ambient light acquisition photosensitive sensor input circuit, an intelligent pyroelectric infrared sensor circuit, a voice control MIC microphone input circuit, a temperature/body temperature detection digital temperature sensor input circuit, a WIFI communication circuit and an electric signal connection between each sensor and an MCU controller ESP8285, wherein the electric signal connection is realized by reading the state of the pyroelectric infrared sensor, the electric signal is wirelessly transmitted to an Internet of things control platform, an Internet security system function is realized, the electric connection is realized with a DC-DC voltage reduction circuit, the mobile phone charging voltage is output through a USB2.0 female seat, the USB2.0 mobile phone charging function is realized, the connecting end of a stainless steel waterproof DS18B20 digital temperature sensor probe is made into a USB2.0 interface to be connected with the USB2.0 side female seat, and the DS18B20 digital temperature sensor is electrically connected with the WIFI communication circuit through the digital temperature sensor input circuit to read the temperature on the DS18B20 digital temperature sensor, so that the contact type temperature body temperature measurement function is realized.

6. The multi-functional internet of things security circuit of claim 1, wherein: the light touch key switch circuit of the illuminating lamp is used as a panel circuit and consists of a light emitting diode NCD0805R1 and touch keys TS-1187A-C-D-B, so that the functions of a light touch illuminating lamp switch and an LED indicator lamp/breathing lamp of the light touch illuminating lamp switch are realized.

7. The multi-functional internet of things security circuit of claim 1, wherein: the isolated switching power supply circuit consists of a core chip, namely a low-power consumption primary side feedback PSR switching power supply chip FM2541S, and is an isolated high-efficiency switching power supply which outputs the maximum power of 18W, so that the effect of providing a reliable +12V power supply for the whole circuit is realized.

8. The multi-functional internet of things security circuit of claim 1, wherein: the DC-DC voltage reduction circuit consists of main electronic elements, namely voltage reduction type direct current power supply converter chips XL1509-5.0E1, and is a DC-DC voltage reduction circuit with the maximum current of 2A and the output voltage of +5V, and the DC-DC voltage reduction circuit provides 10W mobile phone charging voltage for the USB2.0 mobile phone charging function.