CN109932973B - Exhibition article microenvironment monitoring system - Google Patents
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- CN109932973B CN109932973B CN201910263776.5A CN201910263776A CN109932973B CN 109932973 B CN109932973 B CN 109932973B CN 201910263776 A CN201910263776 A CN 201910263776A CN 109932973 B CN109932973 B CN 109932973B
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Abstract
The invention discloses a system for monitoring microenvironment of a exhibit, which comprises a frequency acquisition circuit, a separation calibration circuit and a frequency selection output circuit, wherein the frequency acquisition circuit acquires analog signals at the input end of a signal transmission channel in a control terminal of the system for monitoring microenvironment of the exhibit, the separation calibration circuit divides the output signals of the frequency acquisition circuit into two paths of signals by using a variable resistor RW1, a variable resistor RW2, a capacitor C3 and a capacitor C4, and the frequency selection output circuit selects a signal output with single frequency by using a frequency selection circuit consisting of a resistor R19-a resistor R21 and a capacitor C13-a capacitor C15, can detect the signal condition of the signal transmission channel in the control terminal of the system for monitoring microenvironment of the exhibit in real time and simultaneously converts the signal frequency into a compensation signal of the analog signals at the input end of the signal transmission channel in the system for monitoring microenvironment of the exhibit.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a system for monitoring a microenvironment of an exhibit.
Background
The network video monitoring system is a system combining an integrated computer IP video technology, a video and audio data compression and decompression processing technology and an Internet application technology, a remote video control system can release a monitoring information monitoring center, the monitoring information monitoring center can reach a computer on a desktop through a computer network, so that the monitoring information monitoring center is integrated with an information management system and an office automation system, better management service is provided, the management level and the efficiency are improved, the exhibition microenvironment monitoring system is designed by taking the monitoring information as a technical core, the management level and the efficiency of exhibition hall environment monitoring are improved, however, the exhibition microenvironment monitoring system can also break down at times, especially, signal frequency hopping and distortion occur, signal disorder is caused, and errors occur in data signals of the exhibition microenvironment monitoring system.
Disclosure of Invention
In view of the above situation, an object of the present invention is to provide a system for monitoring a microenvironment of an exhibit, which can detect the signal condition of a signal transmission channel in a control terminal of the system for monitoring the microenvironment of the exhibit in real time, and simultaneously convert the signal frequency into a compensation signal of an analog signal at the input end of the signal transmission channel in the system for monitoring the microenvironment of the exhibit.
The technical scheme for solving the problem is as follows: a monitoring system for microenvironment of exhibit comprises a frequency acquisition circuit, a separation calibration circuit and a frequency selection output circuit, wherein the frequency acquisition circuit acquires analog signals at the input end of a signal transmission channel in a control terminal of the monitoring system for microenvironment of exhibit, the signal transmission channel is a channel for receiving the analog signals at the control terminal of the monitoring system for microenvironment of exhibit, the separation calibration circuit uses a variable resistor RW1, a variable resistor RW2, a capacitor C3 and a capacitor C4 to divide the output signals of the frequency acquisition circuit into two paths of signals, one path uses a diode D3, a diode D4, a capacitor C5, a capacitor C6 and a variable resistor RW3 to form a rectifying circuit to rectify the signals, simultaneously uses a triode Q1 and a capacitor C7-C9 to form a frequency modulation circuit to modulate the signals, and simultaneously uses an inductor L2, a capacitor C10 and a capacitor C11 to form a filter circuit to filter and then input the filtered signals into an AR2 in-phase, the frequency-selecting output circuit comprises a frequency-selecting circuit consisting of a resistor R19-a resistor R21 and a capacitor C13-a capacitor C15 and is used for screening out signal output with single frequency, namely compensating signals of analog signals at the input end of a signal transmission channel in a control terminal of the exhibition microenvironment monitoring system;
the separation calibration circuit comprises a variable resistor RW1, a contact 2 of a variable resistor RW1 is connected with a resistor R2 and one end of a capacitor C4, a contact 1 of the variable resistor RW 4 is connected with the other end of the capacitor C4 and one end of the resistor R4, a contact 3 of the variable resistor RW 4 is connected with the other end of the capacitor C4 and the anode of a diode D4, the cathode of the diode D4 is connected with the cathode of the capacitor C4 and one end of a contact 2 of the variable resistor RW 4, one end of the capacitor C4 and the collector of a transistor Q4, a contact 1 of the variable resistor RW 4 is connected with the other end of the capacitor C4 and the anode of the diode D4, a contact 3 of the variable resistor RW 4 is connected with the base of a transistor Q4 and one end of the capacitor C4, and the emitter of the transistor Q4 is connected with the other end of the resistor R4 and the other end of the capacitor C4, the emitter of the transistor Q4 and the other end of the capacitor C4 are connected with the capacitor C4. The other ends of the resistor R and the capacitor C are grounded, the other end of the capacitor C is connected with one ends of the inductor L, the resistor R and the capacitor C, the other end of the inductor L is connected with one ends of the resistor R and the capacitor C, the other ends of the resistor R, the capacitor C and the capacitor C are grounded, the other end of the resistor R is connected with the non-inverting input end of the amplifier AR and the cathode of the diode D, the other end of the resistor R is connected with one end of the resistor R and the contact 2 of the variable resistor RW, the contact 1 of the variable resistor RW is connected with the other end of the resistor R, the contact 3 of the variable resistor RW is connected with the cathode of the diode D and the anode of the diode D, the anode of the diode D is connected with the cathode of the diode D and the non-inverting input end of the amplifier AR, the other end of the resistor R is grounded, the output end of the amplifier AR is connected with the other end of, The anode of the diode D7, the emitter of the triode Q2 and the base of the triode Q3, the other end of the resistor R11 is connected with the base of the triode Q2 and one end of the resistor R12, the other end of the resistor R12 is grounded, the collector of the triode Q2 is grounded, the collector of the triode Q3 is connected with one end of the resistor R13, the other end of the resistor R13 is connected with the power supply +5V, the inverting input end of the operational amplifier AR2 is connected with one ends of the resistor R14 and the resistor R15, the other end of the resistor R14 is grounded, and the other end of the resistor R15 is connected with the output end of the operational amplifier.
Through the technical scheme, the invention has the beneficial effects that:
1. the output signal of the frequency acquisition circuit is divided into two paths of signals by using a variable resistor RW1, a variable resistor RW2, a capacitor C3 and a capacitor C4, the two paths of signals are signals with the same frequency, the potential ratio of the two paths of signals can be adjusted by changing the resistance ratio of the variable resistor RW1 and the variable resistor RW2, noise in the signals is filtered by the capacitor C3 and the capacitor C4, one path of signals is rectified by using a rectifying circuit formed by a diode D3, a diode D4, the capacitor C5, a capacitor C6 and the variable resistor RW3, the signals are rectified by using the unidirectional conduction property of a diode D3 and a diode D4, the capacitor C5 and the capacitor C6 are filter capacitors, the amplitude of the output signal of the rectifying circuit can be adjusted by changing the resistance of the variable resistor RW3, a frequency modulation circuit formed by a triode Q1 and the capacitor C7-capacitor C9 is used for modulating the frequency of the signals, the capacitor C7 and the capacitor C8 are bypass, the capacitor C9 is a decoupling capacitor, so that low-frequency signal noise is filtered, and frequency modulation of signals is realized; 2. a switch circuit consisting of a diode D5 and a diode D6 limits signal potential, an operational amplifier AR1 is used for amplifying signals in phase to compensate conduction loss of the signals, an abnormal low-level signal is filtered by a triode Q1, the abnormal high-level signal is fed back to an emitter of a triode Q1 by the triode Q3, the amplification of an output signal of the operational amplifier AR1 is adjusted by the triode Q1 and the triode Q2 to ensure the potential of the compensation signals, finally, the two paths of signals are input into an in-phase input end of an operational amplifier AR2 together, the in-phase amplified signal of the operational amplifier AR2 is input into a frequency-selecting output circuit, the screening and calibration of the signal potential and the frequency are realized, and the reliability of the compensation signals is ensured.
Drawings
FIG. 1 is a block diagram of the system of the present invention.
Fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1 to 2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
In the first embodiment, a system for monitoring a microenvironment of a exhibit comprises a frequency acquisition circuit, a separation calibration circuit and a frequency selection output circuit, wherein the frequency acquisition circuit acquires an analog signal at an input end of a signal transmission channel in a control terminal of the system for monitoring the microenvironment of the exhibit, the signal transmission channel is a channel for receiving the analog signal at the control terminal of the system for monitoring the microenvironment of the exhibit, the separation calibration circuit uses a variable resistor RW1, a variable resistor RW2, a capacitor C3 and a capacitor C4 to divide an output signal of the frequency acquisition circuit into two paths of signals, one path uses a diode D3, a diode D4, a capacitor C5, a capacitor C6 and a variable resistor RW3 to form a rectification circuit to rectify the signal, simultaneously uses a triode Q1 and a capacitor C7-capacitor C9 to form a frequency modulation circuit to modulate the signal, and uses an inductor L2, a capacitor C10 and a capacitor C11 to form a filter circuit to input the filtered signal into an in, the frequency-selecting output circuit comprises a frequency-selecting circuit consisting of a resistor R19-a resistor R21 and a capacitor C13-a capacitor C15 and is used for screening out signal output with single frequency, namely compensating signals of analog signals at the input end of a signal transmission channel in a control terminal of the exhibition microenvironment monitoring system;
the separation calibration circuit uses a variable resistor RW1, a variable resistor RW2, a capacitor C3 and a capacitor C4 to divide the output signal of the frequency acquisition circuit into two paths of signals, the two paths of signals are signals with the same frequency, the potential ratio of the two paths of signals can be adjusted by changing the resistance ratio of the variable resistor RW1 and the variable resistor RW2, the capacitor C3 and the capacitor C4 filter noise in the signals, one path of signals is rectified by a rectifying circuit formed by the diode D3, the diode D4, the capacitor C5, the capacitor C6 and the variable resistor RW3, the signals are rectified by the unidirectional conduction property of the diode D3 and the diode D4, the capacitors C5 and the capacitor C6 are filter capacitors, the amplitude of the output signal of the rectifying circuit can be adjusted by changing the resistance value of the variable resistor RW3, a frequency modulation circuit is formed by a triode Q1 and the capacitor C7-capacitor C9, the capacitor C7 and the capacitor C8 are bypass capacitors, filtering the noise of high-frequency signals, wherein a capacitor C9 is a decoupling capacitor and filtering low-frequency signal noise to realize frequency modulation of the signals, a filter circuit consisting of an inductor L2, a capacitor C10 and a capacitor C11 is used for filtering, then the filter circuit is input into the in-phase input end of an operational amplifier AR2, two paths of signals consist of a diode D5 and a diode D6 to limit the signal potential, an operational amplifier AR1 is used for amplifying signals in phase to compensate the conduction loss of the signals, a triode Q1 is used for filtering abnormal low-level signals, a triode Q3 feeds back abnormal high-level signals to the emitter of a triode Q1, a triode Q1 and a triode Q2 are used for adjusting the amplification of the output signals of the operational amplifier AR1 to ensure the potential of the compensation signals, finally the two paths of signals are input into the in-phase input end of the operational amplifier AR2, the operational amplifier AR2 inputs the signals in-phase amplified signals into, the reliability of the compensation signal is ensured;
in the specific structure of the separate calibration circuit, a contact 2 of the variable resistor RW1 is connected to one end of the resistor R2 and one end of the capacitor C4, a contact 1 of the variable resistor RW1 is connected to the other end of the capacitor C1 and one end of the capacitors C1 and R1, a contact 3 of the variable resistor RW1 is connected to the other end of the capacitor C1 and the anode of the diode D1, the cathode of the diode D1 is connected to the cathode of the capacitor C1 and one end of the capacitor C1, the cathode of the diode D1 is connected to the contact 2 of the variable resistor RW1, one end of the capacitor C1 and the collector of the transistor Q1, a contact 1 of the variable resistor RW1 is connected to the other end of the capacitor C1 and the anode of the diode D1, a contact 3 of the variable resistor RW1 is connected to the base of the transistor Q1 and one end of the capacitor C1, an emitter of the transistor Q1 is connected to one end of the resistor R1, an emitter of the other end of the resistor R1 and the capacitor C1, and one end of the capacitor C1, The other end of the capacitor C8 is grounded, the other end of the capacitor C8 is connected to one end of the inductor L8, the resistor R8 and one end of the capacitor C8, the other end of the inductor L8 is connected to one end of the resistor R8 and one end of the capacitor C8, the other ends of the resistor R8, the capacitor C8 and the capacitor C8 are grounded, the other end of the resistor R8 is connected to the non-inverting input end of the operational amplifier AR 8 and the negative electrode of the diode D8, the other end of the resistor R8 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the negative electrode of the diode D8 and the positive electrode of the resistor R8, the positive electrode of the diode D8 is connected to the negative electrode of the diode D8 and the non-inverting input end of the operational amplifier AR 8, the inverting input end of the operational amplifier AR 8 and the output end of the resistor R8 are connected to the negative electrode of the operational amplifier R8 and the negative electrode of the operational amplifier, The anode of the diode D7, the emitter of the triode Q2 and the base of the triode Q3, the other end of the resistor R11 is connected with the base of the triode Q2 and one end of the resistor R12, the other end of the resistor R12 is grounded, the collector of the triode Q2 is grounded, the collector of the triode Q3 is connected with one end of the resistor R13, the other end of the resistor R13 is connected with the power supply +5V, the inverting input end of the operational amplifier AR2 is connected with one ends of the resistor R14 and the resistor R15, the other end of the resistor R14 is grounded, and the other end of the resistor R15 is connected with the output end of the operational amplifier.
In the second embodiment, on the basis of the first embodiment, the frequency selection output circuit uses a resistor R19-a resistor R21 and a capacitor C13-a capacitor C15 to form a frequency selection circuit to filter out a signal output with a single frequency, the signal with the single frequency is relatively stable, and an abnormal signal can also be filtered out, that is, a compensation signal of an analog signal at an input end of a signal transmission channel in a control terminal of the exhibition microenvironment monitoring system, one end of a capacitor C13 is connected to a non-inverting input end of the amplifier AR2 and one end of a resistor R16, the other end of a capacitor C13 is connected to one ends of a resistor R17 and a capacitor C14, the other end of a capacitor C14 is connected to one end of a resistor R18 and a signal output port, the other end of a resistor R16 is connected to one end of a capacitor C15 and the other end of a resistor R18, and the.
In a third embodiment, on the basis of the second embodiment, the frequency acquisition circuit selects a signal frequency collector J1 with the model number of SJ-ADC to acquire an analog signal at the input end of a signal transmission channel in the control terminal of the exhibition microenvironment monitoring system, a voltage regulator tube D1 stabilizes voltage, a power supply of the signal frequency collector J1 is connected with one end of a capacitor C1 and +5V of the power supply, a grounding end of a signal frequency collector J1 is grounded, an output end of a signal frequency collector J1 is connected with the other end of the capacitor C1, one end of a resistor R1 and a cathode of a voltage regulator tube D1, an anode of the voltage regulator tube D1 is grounded, the other end of a resistor R1 is connected with one end of the capacitor C2 and an anode of a diode D2, the other end of the capacitor C2 is grounded, and a cathode of the diode D85.
The invention relates to a monitoring system for microenvironment of a exhibit, which comprises a frequency acquisition circuit, a separation calibration circuit and a frequency selection output circuit, wherein the frequency acquisition circuit acquires an analog signal at the input end of a signal transmission channel in a control terminal of the monitoring system for microenvironment of the exhibit, the signal transmission channel is a channel for receiving the analog signal at the control terminal of the monitoring system for microenvironment of the exhibit, the separation calibration circuit uses a variable resistor RW1, a variable resistor RW2, a capacitor C3 and a capacitor C4 to divide the output signal of the frequency acquisition circuit into two paths of signals with the same frequency, the potential ratio of the two paths of signals can be adjusted by changing the resistance ratio of the variable resistor RW1 and the variable resistor RW2, the capacitor C3 and the capacitor C4 filter noise in the signals, one path uses a rectifier circuit comprising a diode D3, a diode D4, a capacitor C5, a capacitor C6 and a variable resistor 3 to rectify the signal, the unidirectional conductivity of a diode D3 and a diode D4 is utilized to realize the rectification of signals, a capacitor C5 and a capacitor C6 are filter capacitors, the amplification of signals output by a rectification circuit can be adjusted by changing the resistance value of a variable resistor RW3, a frequency modulation circuit is formed by a triode Q1, a capacitor C7 and a capacitor C9 to modulate the frequency of the signals, a capacitor C7 and a capacitor C8 are bypass capacitors, the noise of high-frequency signals is filtered, a capacitor C9 is a decoupling capacitor, the noise of low-frequency signals is filtered, the frequency modulation of the signals is realized, finally, a filter circuit is formed by an inductor L2, a capacitor C10 and a capacitor C11 to be input into the non-inverting input end of an operational amplifier AR2 after filtering, the two paths of signals form a switching circuit by a diode D5 and a diode D6 to limit the signal potential, the signals are amplified in phase by the operational amplifier AR1 to compensate the conduction loss of the signals, an abnormal low-level signal is filtered by a triode Q39, the triode Q1 and the triode Q2 adjust the amplification of the output signal of the operational amplifier AR1, the potential of the compensation signal is ensured, the two paths of signals are input into the in-phase input end of the operational amplifier AR2 together, the in-phase amplified signal of the operational amplifier AR2 is input into the frequency selection output circuit, the screening and calibration of the signal potential and the signal frequency are realized, the reliability of the compensation signal is ensured, the frequency selection output circuit utilizes the frequency selection circuit consisting of the resistor R19, the resistor R21 and the capacitor C13 and the capacitor C15 to screen out the signal output with single frequency, and the compensation signal is the compensation signal of the analog signal at the input end of the signal transmission channel in the control terminal of the exhibition microenvironment monitoring system.
While the invention has been described in further detail with reference to specific embodiments thereof, it is not intended that the invention be limited to the specific embodiments thereof; for those skilled in the art to which the present invention pertains and related technologies, the extension, operation method and data replacement should fall within the protection scope of the present invention based on the technical solution of the present invention.
Claims (3)
1. The utility model provides a showpiece microenvironment monitored control system, includes frequency acquisition circuit, separation calibration circuit and frequency-selective output circuit, its characterized in that: the frequency acquisition circuit acquires an analog signal at the input end of a signal transmission channel in a control terminal of the exhibition microenvironment monitoring system, the signal transmission channel is a channel for receiving the analog signal at the control terminal of the exhibition microenvironment monitoring system, the separation calibration circuit uses a variable resistor RW1, a variable resistor RW2, a capacitor C3 and a capacitor C4 to divide the output signal of the frequency acquisition circuit into two paths of signals, one path uses a rectifying circuit composed of a diode D3, a diode D4, a capacitor C5, a capacitor C6 and a variable resistor RW3 to rectify the signal, simultaneously uses a triode Q1 and a capacitor C7-C9 to compose a frequency modulation circuit to modulate the signal, simultaneously uses an inductor L2, a capacitor C10 and a capacitor C11 to compose a filter circuit to filter and input the filter circuit into the in-phase input end of an operational amplifier AR2, uses a diode D5 and a diode D6 to compose a switch circuit to limit the signal potential, and uses a triode Q1, the triode Q3 feeds back an abnormal high-level signal to an emitter of the triode Q1, one path of signal output potential is adjusted, the two paths of signals are input into a non-inverting input end of the operational amplifier AR2 together, and the frequency selection output circuit uses a resistor R19-a resistor R21 and a capacitor C13-a capacitor C15 to form a frequency selection circuit to select a signal output with single frequency, namely a compensation signal of an analog signal at the input end of a signal transmission channel in a control terminal of the exhibition product microenvironment monitoring system;
the separation calibration circuit comprises a variable resistor RW1, a contact 2 of a variable resistor RW1 is connected with a resistor R2 and one end of a capacitor C4, a contact 1 of the variable resistor RW 4 is connected with the other end of the capacitor C4 and one end of the resistor R4, a contact 3 of the variable resistor RW 4 is connected with the other end of the capacitor C4 and the anode of a diode D4, the cathode of the diode D4 is connected with the cathode of the capacitor C4 and one end of a contact 2 of the variable resistor RW 4, one end of the capacitor C4 and the collector of a transistor Q4, a contact 1 of the variable resistor RW 4 is connected with the other end of the capacitor C4 and the anode of the diode D4, a contact 3 of the variable resistor RW 4 is connected with the base of a transistor Q4 and one end of the capacitor C4, and the emitter of the transistor Q4 is connected with the other end of the resistor R4 and the other end of the capacitor C4, the emitter of the transistor Q4 and the other end of the capacitor C4 are connected with the capacitor C4. The other ends of the resistor R and the capacitor C are grounded, the other end of the capacitor C is connected with one ends of the inductor L, the resistor R and the capacitor C, the other end of the inductor L is connected with one ends of the resistor R and the capacitor C, the other ends of the resistor R, the capacitor C and the capacitor C are grounded, the other end of the resistor R is connected with the non-inverting input end of the amplifier AR and the cathode of the diode D, the other end of the resistor R is connected with one end of the resistor R and the contact 2 of the variable resistor RW, the contact 1 of the variable resistor RW is connected with the other end of the resistor R, the contact 3 of the variable resistor RW is connected with the cathode of the diode D and the anode of the diode D, the anode of the diode D is connected with the cathode of the diode D and the non-inverting input end of the amplifier AR, the other end of the resistor R is grounded, the output end of the amplifier AR is connected with the other end of, The anode of the diode D7, the emitter of the triode Q2 and the base of the triode Q3, the other end of the resistor R11 is connected with the base of the triode Q2 and one end of the resistor R12, the other end of the resistor R12 is grounded, the collector of the triode Q2 is grounded, the collector of the triode Q3 is connected with one end of the resistor R13, the other end of the resistor R13 is connected with the power supply +5V, the inverting input end of the operational amplifier AR2 is connected with one ends of the resistor R14 and the resistor R15, the other end of the resistor R14 is grounded, and the other end of the resistor R15 is connected with the output end of the operational amplifier.
2. The system for monitoring the microenvironment of an exhibit of claim 1, wherein: the frequency-selecting output circuit comprises a capacitor C13, one end of a capacitor C13 is connected with a non-inverting input end of an amplifier AR2 and one end of a resistor R16, the other end of the capacitor C13 is connected with one end of a resistor R17 and one end of a capacitor C14, the other end of the capacitor C14 is connected with one end of the resistor R18 and a signal output port, the other end of the resistor R16 is connected with one end of the capacitor C15 and the other end of the resistor R18, and the other ends of the resistor R17 and the capacitor C15 are grounded.
3. The system for monitoring the microenvironment of an exhibit of claim 2, wherein: the frequency acquisition circuit comprises a signal frequency collector J1 with the model of SJ-ADC, a power supply of the signal frequency collector J1 is connected with one end of a capacitor C1 and a power supply +5V, the grounding end of the signal frequency collector J1 is grounded, the output end of the signal frequency collector J1 is connected with the other end of the capacitor C1, one end of a resistor R1 and the cathode of a voltage regulator tube D1, the anode of the voltage regulator tube D1 is grounded, the other end of the resistor R1 is connected with one end of the capacitor C2 and the anode of a diode D2, the other end of the capacitor C2 is grounded, and the cathode of the diode D2 is connected with the other end of the resistor R2.
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| CN110266291B (en) * | 2019-06-26 | 2020-08-14 | 郑州工程技术学院 | Industrial control system based on Internet of things |
| CN110244678B (en) * | 2019-06-27 | 2020-05-05 | 河南鑫安利消防安全评价有限公司 | Industrial building fire safety assessment system |
| CN110376989B (en) * | 2019-07-22 | 2020-06-02 | 郑州工程技术学院 | Industrial control system based on big data |
| CN110887869A (en) * | 2019-11-29 | 2020-03-17 | 苏业梅 | KYN type high-voltage board dew point detection circuitry |
| CN111323154B (en) * | 2020-04-21 | 2020-12-18 | 甘肃交达工程检测科技有限公司 | Construction stress detection system based on block chain bridge |
| CN111487907B (en) * | 2020-04-24 | 2020-12-22 | 南京南大工程检测有限公司 | Building construction monitored control system based on 5G communication |
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| CN109412627B (en) * | 2018-09-26 | 2019-08-06 | 郑州工程技术学院 | A kind of industrial control system based on Internet of Things |
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