CN106441497A - Signal buffering and amplifying type water level early warning system based on Internet-of-Things technology - Google Patents

Signal buffering and amplifying type water level early warning system based on Internet-of-Things technology Download PDF

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Publication number
CN106441497A
CN106441497A CN201610767186.2A CN201610767186A CN106441497A CN 106441497 A CN106441497 A CN 106441497A CN 201610767186 A CN201610767186 A CN 201610767186A CN 106441497 A CN106441497 A CN 106441497A
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CN
China
Prior art keywords
pole
resistance
audion
amplifier
electric capacity
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Application number
CN201610767186.2A
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Chinese (zh)
Inventor
薛鸿雁
Original Assignee
成都东创精英科技有限公司
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Priority to CN201610767186.2A priority Critical patent/CN106441497A/en
Publication of CN106441497A publication Critical patent/CN106441497A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
    • G01F23/14Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm by measurement of pressure
    • G01F23/18Indicating, recording or alarm devices actuated electrically

Abstract

The invention discloses a signal buffering and amplifying type water level early warning system based on an Internet-of-Things technology. The system is characterized by being mainly composed of a single chip microcomputer, an analog-digital conversion chip, a signal processing unit, a water level sensor, a wireless transmission unit and an upper computer. The analog-digital conversion chip and the signal processing unit are connected with the single chip microcomputer, the water level sensor is connected with the analog-digital conversion chip, the wireless transmission unit is connected with the signal processing unit, and the upper computer is connected with the wireless transmission unit through a wireless network. The system can well process monitoring signals, the monitoring signals received by the upper computer are more stable, workers can better analyze the water level of a riverway accurately according to the monitoring signals, and therefore the early warning effect of the system is greatly improved.

Description

Signal damping scale-up version water level early warning system based on technology of Internet of things
Technical field
The present invention relates to a kind of water level early warning system, specifically refer to a kind of signal damping scale-up version based on technology of Internet of things Water level early warning system.
Background technology
Hydrological monitoring equipment is indispensable equipment in water conservancy construction, and being monitored early warning to the water level in river course is water Indispensable part in sharp flood control work.With the continuous development of technology of Internet of things, there has been based on Internet of Things The signal damping scale-up version water level early warning system of network technology, can monitor the water level in river course in real time by water level early warning system, And the probability that flood occurs is predicted according to monitoring result premise, perform Emergency Preparedness such that it is able to before occurring in flood, subtract Few loss.But existing very big defect is also had based on the signal damping scale-up version water level early warning system of technology of Internet of things, I.e. this water level early warning system cannot be processed to monitoring signals well, leads to the monitoring signals that receiving terminal receives unstable Fixed, staff accurately cannot be analyzed to river water level according to monitoring signals, strong influence early warning effect.
Content of the invention
It is an object of the invention to solve existing water level early warning system cannot process to monitoring signals well, lead Cause the defect that the monitoring signals that receiving terminal receives are unstable, a kind of signal damping scale-up version water based on technology of Internet of things is provided Position early warning system.
The purpose of the present invention is by following technical proposals reality:Signal damping scale-up version water level based on technology of Internet of things is pre- Alarm system, mainly by single-chip microcomputer, the modulus conversion chip being connected with single-chip microcomputer respectively and signal processing unit, with analog digital conversion The level sensor that chip is connected, the wireless transmission unit being connected with signal processing unit, and by wireless network with The host computer composition that wireless transmission unit is connected;Described signal processing unit is by amplifier P1, amplifier P2, amplifier P3, N The diode D1 that pole is connected with the positive pole of amplifier P1, P pole is connected with single-chip microcomputer, is serially connected in the negative pole of amplifier P1 and defeated Go out the resistance R1 between end, two poles that N pole is connected, P pole is connected with the positive pole of amplifier P2 with the outfan of amplifier P1 Pipe D2, one end is connected with the negative pole of amplifier P2, the resistance R2 of other end ground connection, is serially connected in the outfan of amplifier P2 and puts Resistance R3 between the positive pole of big device P3, the diode that P pole ground connection, N pole are connected with the negative pole of amplifier P3 after resistance R4 D1, the electric capacity C1 that positive pole is connected with the positive pole of amplifier P3, negative pole is connected with the outfan of amplifier P3, with electric capacity C1 phase Resistance R5 in parallel, the constant-current source circuit being connected with the outfan of amplifier P1, P pole is connected with the outfan of amplifier P3 Connect, diode D3 that N pole is connected with constant-current source circuit after resistance R8, the Hyblid Buffer Amplifier electricity being connected with constant-current source circuit Road, and the pulse modulate circuit composition being connected with constant-current source circuit and buffer amplifier circuit respectively;Described pulse conditioning electricity The outfan on road is connected with wireless transmission unit.
Further, by field effect transistor MOS3, audion VT3, audion VT4, negative pole is through electricity for described buffer amplifier circuit Be connected with the grid of field effect transistor MOS3 after resistance R14, electric capacity C6, one end and field effect that positive pole is connected with constant-current source circuit The drain electrode of pipe MOS3 is connected, the other end is sequentially grounded after resistance R15 and resistance R17 resistance R16, one end and field effect transistor The source electrode of MOS3 is connected, the resistance R18 of other end ground connection, and positive pole is connected with the negative pole of electric capacity C6, negative pole is after resistance R19 The electric capacity C7 being connected with the emitter stage of audion VT4, one end is connected with the emitter stage of audion VT4, the other end is grounded Resistance R20, P pole is connected with the emitter stage of audion VT4, N pole is connected with pulse modulate circuit diode D7, Yi Jizheng The electric capacity C8 composition that pole is connected with the emitter stage of audion VT3, negative pole is connected with the N pole of diode D7 after resistance R21; The source electrode of described field effect transistor MOS3 is connected with the base stage of audion VT4, its drain electrode is connected with the base stage of audion VT3; The emitter stage of described audion VT3 is connected with the colelctor electrode of audion VT4, its grounded collector.
Described constant-current source circuit by field effect transistor MOS1, field effect transistor MOS2, the grid phase of one end and field effect transistor MOS1 Connect, the resistance R7 of another termination power, and be serially connected in the drain electrode of field effect transistor MOS1 and field effect transistor MOS2 source electrode it Between potentiometer R6 composition;The source electrode of described field effect transistor MOS1 is connected with the outfan of amplifier P1, its grid and field are imitated Should pipe MOS2 drain electrode be connected, its drain electrode is connected with the grid of field effect transistor MOS2;The source electrode of described field effect transistor MOS2 It is connected with the positive pole of electric capacity C6 and pulse modulate circuit respectively, its drain electrode is then connected with the control end of potentiometer R6;Described The source electrode of field effect transistor MOS2 is connected with the N pole of diode D3 also after resistance R8.
By audion VT1, audion VT2, negative pole is connected, just described pulse modulate circuit with the base stage of audion VT1 The electric capacity C2 that pole is then connected with the N pole of diode D7, positive pole is connected with the positive pole of electric capacity C6, the electric capacity C3, P of minus earth The diode that pole is connected with the colelctor electrode of audion VT1, N pole is connected with the colelctor electrode of audion VT2 after resistance R11 D5, the electric capacity C4 that negative pole is connected with the base stage of audion VT2, positive pole is connected with the positive pole of electric capacity C3 after resistance R9, N pole Be connected with the emitter stage of audion VT1, Zener diode D4 that P pole is connected with the negative pole of electric capacity C3, be serially connected in audion Resistance R10 between the negative pole of the base stage of VT2 and electric capacity C3, P pole is connected with the negative pole of electric capacity C3, N pole after resistance R12 with The diode D6 that the emitter stage of audion VT2 is connected, forward end is connected with the colelctor electrode of audion VT2, backward end is through electricity The not gate A that is connected with wireless transmission unit after resistance R13, and the backward end of positive pole NAND gate A be connected, the electricity of minus earth Hold C5 composition.
Described field effect transistor MOS1 and field effect transistor MOS2 are 2SK389BL type field effect transistor.
The present invention compared with prior art has advantages below and beneficial effect:
(1) present invention can be very good monitoring signals are processed, so that the monitoring signals that host computer receives are more Plus stable, so that staff can preferably accurately be analyzed to river water level according to monitoring signals, greatly carry The high early warning effect of the present invention.
(2) present invention is processed to monitoring signals using signal processing unit, and this signal processing unit can be to signal Waveform carries out amplitude limit, the interference of prune wave tops or bottom, makes monitoring signals more stable, thus improve host computer receiving Monitoring signals stability.
(3) the permissible signal processing unit of the present invention can be amplified to monitoring signals processing, thus make up signal going out Existing is weak, makes the signal that host computer receives apparent.
Brief description
Fig. 1 is the overall structure diagram of the present invention.
Fig. 2 is the structure chart of the signal processing unit of the present invention.
Fig. 3 is the structure chart of the buffer amplifier circuit of the present invention.
Specific embodiment
With reference to embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to This.
Embodiment
As shown in figure 1, the present invention is mainly by single-chip microcomputer, at the modulus conversion chip being connected with single-chip microcomputer respectively and signal Reason unit, the level sensor being connected with modulus conversion chip, the wireless transmission unit being connected with signal processing unit, with And the host computer being connected with wireless transmission unit by wireless network is formed.
This level sensor is used for gathering the water level signal in river course, and it passes through Pipe installing in water, level sensor It is that this installation method has been ripe technology in order to prevent water flowing from affecting the result of level measuring by Pipe installing, Here do not do and excessively repeat;This level sensor adopts AL200W type pressure resistance type level sensor, this AL200W type pressure resistance type water The hydrostatic pressure being directly proportional to liquid level depth is accurately measured by level sensor, and is converted into standard analog signal output, Set up the linear corresponding relation of output signal and liquid depth, such that it is able to measure level sensor end to the liquid of liquid level Position height.
This single-chip microcomputer, modulus conversion chip, signal processing unit and wireless transmission unit are then integrated in an equipment Install in case, this equipment is installed case and is then arranged on bank.The water level mould that level sensor can be exported by this modulus conversion chip Intend signal and be converted to water level digital signal, it adopts ADC0809 modulus conversion chip to realize, this ADC0809 analog digital conversion core The analog input end IN0 pin of piece is connected with level sensor.This single-chip microcomputer is then the control process center of the present invention, its To be realized using AT89S51 single-chip microcomputer, the P1.0 signal input pin of this AT89S51 single-chip microcomputer and ADC0809 analog digital conversion core Digital output end 21 pin of piece is connected, and its P3.1 signal output pin is then connected with signal processing unit.This signal Processing unit can be processed to water level digital signal, and its outfan is connected with the signal input part of wireless transmission unit. This wireless transport module is used for for water level digital signal passing through wireless network transmissions to host computer, and it is wirelessly transferred using ZIGBEE Module is realizing.Host computer is existing computer system, and it can be analyzed to the water level signal receiving and show.
In order to preferably process to water level digital signal, as shown in Fig. 2 described signal processing unit is by amplifier P1, amplifier P2, the diode D1 that amplifier P3, N pole is connected with the positive pole of amplifier P1, P pole is connected with single-chip microcomputer, string It is connected on the resistance R1 between the negative pole of amplifier P1 and outfan, N pole is connected with the outfan of amplifier P1, P pole and amplification The diode D2 that the positive pole of device P2 is connected, one end is connected with the negative pole of amplifier P2, the resistance R2 of other end ground connection, concatenation Resistance R3 between the outfan and the positive pole of amplifier P3 of amplifier P2, P pole ground connection, N pole after resistance R4 with amplifier The diode D1 that the negative pole of P3 is connected, positive pole is connected with the positive pole of amplifier P3, the outfan phase of negative pole and amplifier P3 The electric capacity C1 connecting, the resistance R5 being in parallel with electric capacity C1, the constant-current source circuit being connected with the outfan of amplifier P1, P pole Be connected with the outfan of amplifier P3, diode D3 that N pole is connected with constant-current source circuit after resistance R8, with constant-current source electricity The buffer amplifier circuit that road is connected, and the pulse modulate circuit being connected with constant-current source circuit and buffer amplifier circuit respectively Composition;The outfan of described pulse modulate circuit is connected with wireless transmission unit.
This amplifier P2, amplifier P3, resistance R3, and diode D3 form amplitude limiting amplifier circuit;This limited range enlargement electricity Can effectively prune the interference of wave tops or bottom in road.Electric capacity C1 plays frequency compensation effect in the state of amplitude limit, thus Make water level digital signal more stable.
Wherein, constant-current source circuit is by field effect transistor MOS1, field effect transistor MOS2, the grid phase of one end and field effect transistor MOS1 Connect, the resistance R7 of another termination power, and be serially connected in the drain electrode of field effect transistor MOS1 and field effect transistor MOS2 source electrode it Between potentiometer R6 composition.The source electrode of described field effect transistor MOS1 is connected with the outfan of amplifier P1, and its grid is imitated with field Should the drain electrode of pipe MOS2 be connected, its drain electrode is connected with the grid of field effect transistor MOS2.The source electrode of described field effect transistor MOS2 It is connected with pulse modulate circuit and buffer amplifier circuit respectively, its drain electrode is then connected with the control end of potentiometer R6.Described The source electrode of field effect transistor MOS2 is connected with the N pole of diode D3 also after resistance R8.This constant-current source circuit can be at signal Reason unit provides constant electric current, and it just can get positive and negative identical current characteristics without adjustment.In order to reach more preferable effect, Described field effect transistor MOS1 and field effect transistor MOS2 all to be realized using 2SK389BL type field effect transistor.
In addition, this pulse modulate circuit is by audion VT1, audion VT2, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, Zener diode D4, diode D5, diode D6 and non- Door A.
During connection, the negative pole of electric capacity C2 is connected with the base stage of audion VT1, and positive pole is then connected with buffer amplifier circuit Connect.The positive pole of electric capacity C3 is connected with the source electrode of field effect transistor MOS2, minus earth.The P pole of diode D5 is with audion VT1's Colelctor electrode is connected, and N pole is connected with the colelctor electrode of audion VT2 after resistance R11.The negative pole of electric capacity C4 and audion VT2 Base stage be connected, positive pole is connected with the positive pole of electric capacity C3 after resistance R9.The N pole of Zener diode D4 and audion VT1 Emitter stage be connected, P pole is connected with the negative pole of electric capacity C3.Resistance R10 is serially connected in the base stage of audion VT2 and electric capacity C3's Between negative pole.The P pole of diode D6 is connected with the negative pole of electric capacity C3, N pole emitter stage with audion VT2 after resistance R12 It is connected.The forward end of not gate A is connected with the colelctor electrode of audion VT2, backward end after resistance R13 with wireless transmission unit It is connected.The backward end of positive pole NAND gate A of electric capacity C5 is connected, minus earth.
Wherein, electric capacity C3 and resistance R9 constitutes RC filter circuit, and this RC filter circuit can filter to interference signal. This audion VT1, audion VT2, diode D5, resistance R11, not gate A and electric capacity C5 are then collectively forming modulate circuit, this tune Reason circuit can further be processed to the waveform of monitoring signals, makes monitoring signals more stable.
As shown in figure 3, described buffer amplifier circuit is by field effect transistor MOS3, audion VT3, audion VT4, resistance R14, Resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, diode D7, electric capacity C6, electric capacity C7 and electric capacity C8 composition.
During connection, the negative pole of electric capacity C6 is connected with the grid of field effect transistor MOS3 after resistance R14, positive pole and field effect The source electrode of pipe MOS2 is connected.One end of resistance R16 is connected with the drain electrode of field effect transistor MOS3, and the other end is sequentially through resistance It is grounded after R15 and resistance R17.One end of resistance R18 is connected with the source electrode of field effect transistor MOS3, and the other end is grounded.Electric capacity C7 Positive pole be connected with the negative pole of electric capacity C6, negative pole is connected with the emitter stage of audion VT4 after resistance R19.Resistance R20's One end is connected with the emitter stage of audion VT4, and the other end is grounded.The P pole of diode D7 is connected with the emitter stage of audion VT4 Connect, N pole is connected with the positive pole of electric capacity C2.The positive pole of electric capacity C8 is connected with the emitter stage of audion VT3, and negative pole is through resistance It is connected with the N pole of diode D7 after R21.The source electrode of described field effect transistor MOS3 is connected with the base stage of audion VT4, its leakage Pole is connected with the base stage of audion VT3.The emitter stage of described audion VT3 is connected with the colelctor electrode of audion VT4, its collection Electrode is grounded.
This field effect transistor MOS3 forms an amplifier, and audion VT3 and audion VT4 then forms an emitter following Device, this structure is the combination of two buffer amplifiers, therefore has very high amplification.This electric capacity C7 and resistance R19 is formed Negative feedback link, the signal of output is fed back to the grid of field effect transistor MOS3 by this negative feedback link, thus improving amplifier Frequency characteristic.This buffer amplifier circuit can be amplified to monitoring signals processing, thus making up the weak of signal appearance.
Water level signal is more stable after signal processing unit processes, thus improving the monitoring signals that host computer receives Stability.
During work, this level sensor gathers the water level signal in river course and is transferred to modulus conversion chip, and this modulus turns Change chip water level signal is converted into digital signal and be sent to single-chip microcomputer, water level signal is transferred to signal processing list by single-chip microcomputer Unit, water level signal is sent to host computer by wireless network by this wireless transmission unit, and this host computer is carried out to water level signal point Analysis, display, staff then judges to river water level situation according to monitoring result, if any the possibility that flood occurs, then carries Before perform Emergency Preparedness.
As described above, the present invention just can be realized well.

Claims (5)

1. the signal damping scale-up version water level early warning system based on technology of Internet of things it is characterised in that:Mainly by single-chip microcomputer, respectively The modulus conversion chip being connected with single-chip microcomputer and signal processing unit, the level sensor being connected with modulus conversion chip, The wireless transmission unit being connected with signal processing unit, and by wireless network be connected with wireless transmission unit upper Machine forms;Described signal processing unit is connected with the positive pole of amplifier P1 by amplifier P1, amplifier P2, amplifier P3, N pole Connect, diode D1 that P pole is connected with single-chip microcomputer, be serially connected in the resistance R1 between the negative pole of amplifier P1 and outfan, N pole with The diode D2 that the outfan of amplifier P1 is connected, P pole is connected with the positive pole of amplifier P2, one end is negative with amplifier P2's Pole is connected, the resistance R2 of other end ground connection, is serially connected in the resistance between the outfan of amplifier P2 and the positive pole of amplifier P3 The diode D1 that R3, P pole ground connection, N pole are connected with the negative pole of amplifier P3 after resistance R4, the positive pole of positive pole and amplifier P3 Be connected, electric capacity C1, the resistance R5 being in parallel with electric capacity C1 that negative pole is connected with the outfan of amplifier P3, with amplifier P1 The constant-current source circuit that is connected of outfan, P pole is connected with the outfan of amplifier P3, N pole after resistance R8 with constant-current source The diode D3 that circuit is connected, the buffer amplifier circuit being connected with constant-current source circuit, and respectively with constant-current source circuit and The pulse modulate circuit composition that buffer amplifier circuit is connected;The outfan of described pulse modulate circuit and wireless transmission unit phase Connect.
2. the signal damping scale-up version water level early warning system based on technology of Internet of things according to claim 1, its feature exists In:Described buffer amplifier circuit by field effect transistor MOS3, audion VT3, audion VT4, negative pole after resistance R14 with field effect The electric capacity C6 that the grid of pipe MOS3 is connected, positive pole is connected with constant-current source circuit, the drain electrode phase of one end and field effect transistor MOS3 The resistance R16 that connection, the other end are sequentially grounded after resistance R15 and resistance R17, one end is connected with the source electrode of field effect transistor MOS3 Connect, the other end ground connection resistance R18, positive pole is connected with the negative pole of electric capacity C6, negative pole after resistance R19 with audion VT4's The electric capacity C7 that emitter stage is connected, one end is connected with the emitter stage of audion VT4, the other end ground connection resistance R20, P pole with The diode D7 that the emitter stage of audion VT4 is connected, N pole is connected with pulse modulate circuit, and positive pole and audion VT3 Emitter stage be connected, electric capacity C8 that negative pole is connected with the N pole of diode D7 after resistance R21 composition;Described field effect transistor The source electrode of MOS3 is connected with the base stage of audion VT4, its drain electrode is connected with the base stage of audion VT3;Described audion VT3 Emitter stage be connected with the colelctor electrode of audion VT4, its grounded collector.
3. the signal damping scale-up version water level early warning system based on technology of Internet of things according to claim 2, its feature exists In:Described constant-current source circuit by field effect transistor MOS1, field effect transistor MOS2, one end is connected with the grid of field effect transistor MOS1, The resistance R7 of another termination power, and it is serially connected in the electricity between the drain electrode of field effect transistor MOS1 and the source electrode of field effect transistor MOS2 Position device R6 composition;The source electrode of described field effect transistor MOS1 is connected with the outfan of amplifier P1, its grid and field effect transistor The drain electrode of MOS2 is connected, its drain electrode is connected with the grid of field effect transistor MOS2;The source electrode of described field effect transistor MOS2 is respectively It is connected with the positive pole of electric capacity C6 and pulse modulate circuit, its drain electrode is then connected with the control end of potentiometer R6;Described field effect Should the source electrode of pipe MOS2 be connected with the N pole of diode D3 also after resistance R8.
4. the signal damping scale-up version water level early warning system based on technology of Internet of things according to claim 3, its feature exists In:Described pulse modulate circuit by audion VT1, audion VT2, negative pole is connected with the base stage of audion VT1, positive pole then with The electric capacity C2 that the N pole of diode D7 is connected, positive pole is connected with the positive pole of electric capacity C6, the electric capacity C3 of minus earth, P pole and three The diode D5 that the colelctor electrode of pole pipe VT1 is connected, N pole is connected with the colelctor electrode of audion VT2 after resistance R11, negative pole Be connected with the base stage of audion VT2, electric capacity C4 that positive pole is connected with the positive pole of electric capacity C3 after resistance R9, N pole and three poles The Zener diode D4 that the emitter stage of pipe VT1 is connected, P pole is connected with the negative pole of electric capacity C3, is serially connected in the base of audion VT2 Resistance R10 between the negative pole of pole and electric capacity C3, P pole is connected with the negative pole of electric capacity C3, N pole after resistance R12 with audion The diode D6 that the emitter stage of VT2 is connected, forward end is connected with the colelctor electrode of audion VT2, backward end is after resistance R13 The not gate A being connected with wireless transmission unit, and the backward end of positive pole NAND gate A be connected, the electric capacity C5 group of minus earth Become.
5. the signal damping scale-up version water level early warning system based on technology of Internet of things according to claim 4, its feature exists In:Described field effect transistor MOS1 and field effect transistor MOS2 are 2SK389BL type field effect transistor.
CN201610767186.2A 2016-08-30 2016-08-30 Signal buffering and amplifying type water level early warning system based on Internet-of-Things technology CN106441497A (en)

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CN107047374A (en) * 2017-03-16 2017-08-18 四川森迪科技发展股份有限公司 A kind of domestic animal automatic water-feeding device low interference automatic water supplementation control system of constant current mode

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CN201402520Y (en) * 2009-05-14 2010-02-10 长安大学 Bridge strain collecting instrument based on wireless sensing network interface
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Publication number Priority date Publication date Assignee Title
CN107018923A (en) * 2017-03-16 2017-08-08 四川森迪科技发展股份有限公司 A kind of cattle breeding automatic water-feeding device automatic water supplementation control system
CN107047374A (en) * 2017-03-16 2017-08-18 四川森迪科技发展股份有限公司 A kind of domestic animal automatic water-feeding device low interference automatic water supplementation control system of constant current mode

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